Categories
The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
(first | last) View (previous 3,000 | next 3,000) (20 | 50 | 100 | 250 | 500)- Abelmoschus (1 member)
- Abies (11 members)
- Abietinella (1 member)
- Abildgaardia (1 member)
- Abronia (22 members)
- Abronia nana (2 members)
- Abronia umbellata (3 members)
- Abronia villosa (2 members)
- Abutilon (18 members)
- Acaena (3 members)
- Acalypha (18 members)
- Acamptopappus (3 members)
- Acamptopappus sphaerocephalus (2 members)
- Acanthocereus (1 member)
- Acanthoscyphus (2 members)
- Acanthoscyphus parishii (4 members)
- Acanthospermum (3 members)
- Acaulon (4 members)
- Acaulon muticum (2 members)
- Achatocarpaceae (2 members)
- Achillea (4 members)
- Achlys (2 members)
- Achnatherum (33 members)
- Achnatherum lemmonii (2 members)
- Achnatherum nelsonii (2 members)
- Achnatherum occidentale (3 members)
- Achnatherum parishii (2 members)
- Achyrachaena (1 member)
- Achyranthes (3 members)
- Achyranthes aspera (2 members)
- Achyronychia (1 member)
- Acleisanthes (13 members)
- Acleisanthes lanceolata (1 member)
- Acmella (2 members)
- Acoelorraphe (1 member)
- Aconitum (7 members)
- Aconitum columbianum (2 members)
- Aconitum maximum (1 member)
- Aconogonon (6 members)
- Aconogonon alaskanum (2 members)
- Aconogonon davisiae (2 members)
- Aconogonon phytolaccifolium (2 members)
- Acoraceae (2 members)
- Acorus (2 members)
- Acourtia (5 members)
- Acrachne (1 member)
- Acrocomia (1 member)
- Acroporium (1 member)
- Acroptilon (1 member)
- Acrostichum (2 members)
- Actaea (2 members)
- Actinostachys (1 member)
- Adelia (1 member)
- Adenocaulon (1 member)
- Adenophyllum (4 members)
- Adenophyllum wrightii (1 member)
- Adenostoma (3 members)
- Adenostoma fasciculatum (3 members)
- Adiantum (9 members)
- Adlumia (1 member)
- Adolphia (2 members)
- Adonis (3 members)
- Aegilops (7 members)
- Aegopogon (1 member)
- Aeluropus (1 member)
- Aeonium (3 members)
- Aeonium arboreum (1 member)
- Agalinis (36 members)
- Agalinis maritima (2 members)
- Agalinis purpurea (2 members)
- Agarista (1 member)
- Agavaceae (18 members)
- Agave (36 members)
- Agave americana (3 members)
- Agave americana subsp. americana (2 members)
- Agave asperrima (1 member)
- Agave deserti (2 members)
- Agave parryi (3 members)
- Agave parryi subsp. parryi (3 members)
- Agave parviflora (1 member)
- Agave schottii (2 members)
- Agave shawii (1 member)
- Agave toumeyana (2 members)
- Agave utahensis (3 members)
- Agave utahensis subsp. utahensis (3 members)
- Agdestis (1 member)
- Ageratina (15 members)
- Ageratina altissima (2 members)
- Ageratum (4 members)
- Agnorhiza (5 members)
- Agoseris (15 members)
- Agoseris apargioides (3 members)
- Agoseris aurantiaca (2 members)
- Agoseris glauca (2 members)
- Agoseris grandiflora (2 members)
- Agoseris heterophylla (3 members)
- Agrimonia (7 members)
- Agropyron (2 members)
- Agrostemma (2 members)
- Agrostemma githago (1 member)
- Agrostis (28 members)
- Aira (3 members)
- Aira caryophyllea (3 members)
- Aizoaceae (24 members)
- Akebia (1 member)
- Alcea (2 members)
- Alchemilla (13 members)
- Alchemilla filicaulis (2 members)
- Aletris (5 members)
- Alisma (5 members)
- Alismataceae (8 members)
- Alkekengi (1 member)
- Allamanda (1 member)
- Allenrolfea (1 member)
- Alliaria (1 member)
- Allionia (3 members)
- Allionia incarnata (2 members)
- Allium (111 members)
- Allium atrorubens (2 members)
- Allium bolanderi (2 members)
- Allium canadense (6 members)
- Allium fimbriatum (3 members)
- Allium geyeri (2 members)
- Allium howellii (3 members)
- Allium lacunosum (4 members)
- Allium obtusum (2 members)
- Allium paniculatum (1 member)
- Allium peninsulare (2 members)
- Allium perdulce (2 members)
- Allium sanbornii (2 members)
- Allium sativum (1 member)
- Allium tolmiei (2 members)
- Allium tricoccum (2 members)
- Allolepis (1 member)
- Alloteropsis (1 member)
- Allotropa (1 member)
- Allowissadula (2 members)
- Almutaster (1 member)
- Alnus (11 members)
- Alnus alnobetula (3 members)
- Alnus incana (2 members)
- Alnus viridis (0 members)
- Aloaceae (2 members)
- Aloe (2 members)
- Aloina (7 members)
- Aloina aloides (1 member)
- Aloina rigida (1 member)
- Alopecurus (11 members)
- Alopecurus aequalis (2 members)
- Alophia (1 member)
- Alpinia (1 member)
- Alsia (1 member)
- Alstonia (2 members)
- Alstroemeria (1 member)
- Alternanthera (10 members)
- Alternanthera ficoidea (1 member)
- Althaea (4 members)
- Alvaradoa (2 members)
- Alvaradoa amorphoides (1 member)
- Alyssum (6 members)
- Amaranthaceae (24 members)
- Amaranthus (6 members)
- Amaranthus sect. Acanthochiton (1 member)
- Amaranthus sect. Acnida (4 members)
- Amaranthus sect. Saueranthus (4 members)
- Amaranthus subg. Acnida (6 members)
- Amaranthus subg. Albersia (15 members)
- Amaranthus subg. Amaranthus (14 members)
- Amauriopsis (1 member)
- Amberboa (1 member)
- Amblyodon (1 member)
- Amblyolepis (1 member)
- Amblyopappus (1 member)
- Amblystegiaceae (40 members)
- Amblystegium (1 member)
- Ambrosia (22 members)
- Amelanchier (20 members)
- Amelanchier alnifolia (3 members)
- Amelanchier canadensis (2 members)
- Amelichloa (3 members)
- Amerorchis (1 member)
- Amianthium (1 member)
- Ammannia (5 members)
- Ammophila (3 members)
- Ammophila breviligulata (2 members)
- Amoreuxia (3 members)
- Ampelaster (1 member)
- Ampelodesmos (1 member)
- Ampelopsis (3 members)
- Amphiachyris (2 members)
- Amphibromus (3 members)
- Amphicarpum (2 members)
- Amphidium (3 members)
- Amphipappus (2 members)
- Amphipappus fremontii (2 members)
- Amphiscirpus (1 member)
- Amsonia (6 members)
- Amsonia ciliata (3 members)
- Amsonia longiflora (2 members)
- Amsonia subg. Amsonia (7 members)
- Amsonia subg. Articularia (3 members)
- Amsonia subg. Sphinctosiphon (9 members)
- Amsonia tabernaemontana (4 members)
- Amsonia tomentosa (2 members)
- Anacamptodon (1 member)
- Anacolia (2 members)
- Anagallis (4 members)
- Anaphalis (1 member)
- Ancistrocactus (2 members)
- Ancistrocarphus (2 members)
- Andreaea (11 members)
- Andreaeaceae (2 members)
- Andreaeobryaceae (2 members)
- Andreaeobryum (1 member)
- Andromeda (2 members)
- Andromeda polifolia (2 members)
- Andropogon (4 members)
- Andropogon glomeratus (5 members)
- Andropogon gyrans (2 members)
- Andropogon sect. Andropogon (2 members)
- Andropogon sect. Leptopogon (16 members)
- Andropogon ternarius (2 members)
- Andropogon virginicus (3 members)
- Androsace (7 members)
- Androsace chamaejasme (1 member)
- Androsace elongata (1 member)
- Androstephium (2 members)
- Anelsonia (1 member)
- Anemia (3 members)
- Anemiaceae (2 members)
- Anemone (33 members)
- Anemone drummondii (2 members)
- Anemone edwardsiana (2 members)
- Anemone multifida (4 members)
- Anemone narcissiflora (3 members)
- Anemone oregana (2 members)
- Anemone patens (1 member)
- Anemone quinquefolia (2 members)
- Anemone virginiana (3 members)
- Anemopsis (1 member)
- Angadenia (1 member)
- Angelonia (1 member)
- Angle (5 members)
- Aniseia (1 member)
- Anisocarpus (2 members)
- Anisocoma (1 member)
- Annona (2 members)
- Annonaceae (6 members)
- Anoda (7 members)
- Anoectangium (3 members)
- Anomobryum (2 members)
- Anomodon (8 members)
- Anomodontaceae (4 members)
- Anredera (2 members)
- Antennaria (41 members)
- Antennaria friesiana (3 members)
- Antennaria howellii (4 members)
- Antennaria luzuloides (2 members)
- Antennaria monocephala (2 members)
- Antennaria parlinii (2 members)
- Antennaria pulcherrima (2 members)
- Antennaria rosea (4 members)
- Anthemis (2 members)
- Anthenantia (2 members)
- Anthephora (1 member)
- Anthoxanthum (8 members)
- Anthoxanthum monticola (2 members)
- Antigonon (1 member)
- Antirrhinum (1 member)
- Antitrichia (2 members)
- Anulocaulis (5 members)
- Anulocaulis leiosolenus (4 members)
- Aongstroemia (1 member)
- Apacheria (1 member)
- Apera (2 members)
- Aphanes (3 members)
- Aphanisma (1 member)
- Aphanorrhegma (1 member)
- Aphanostephus (6 members)
- Aphanostephus ramosissimus (2 members)
- Aphanostephus skirrhobasis (3 members)
- Aphragmus (1 member)
- Aplectrum (1 member)
- Aplodon (1 member)
- Apluda (1 member)
- Apocynaceae (72 members)
- Apocynum (3 members)
- Apodanthaceae (2 members)
- Apodanthera (2 members)
- Apodanthera undulata (1 member)
- Aponogeton (1 member)
- Aponogetonaceae (2 members)
- Aptenia (1 member)
- Apteria (1 member)
- Aquilegia (23 members)
- Aquilegia coerulea (4 members)
- Aquilegia formosa (3 members)
- Arabidopsis (6 members)
- Arabidopsis arenosa (1 member)
- Arabidopsis lyrata (3 members)
- Arabis (16 members)
- Arabis pycnocarpa (2 members)
- Araceae (16 members)
- Arachniodes (1 member)
- Araujia (2 members)
- Arbutus (3 members)
- Arceuthobium (9 members)
- Arceuthobium campylopodum (13 members)
- Arceuthobium vaginatum (1 member)
- Archidiaceae (2 members)
- Archidium (6 members)
- Arctagrostis (2 members)
- Arctagrostis latifolia (2 members)
- Arctanthemum (2 members)
- Arctanthemum arcticum (2 members)
- Arctium (3 members)
- Arctoa (3 members)
- Arctomecon (3 members)
- Arctophila (1 member)
- Arctostaphylos (77 members)
- Arctostaphylos bakeri (2 members)
- Arctostaphylos canescens (2 members)
- Arctostaphylos crustacea (6 members)
- Arctostaphylos glandulosa (8 members)
- Arctostaphylos hookeri (2 members)
- Arctostaphylos manzanita (6 members)
- Arctostaphylos mewukka (2 members)
- Arctostaphylos montana (2 members)
- Arctostaphylos nevadensis (2 members)
- Arctostaphylos nummularia (2 members)
- Arctostaphylos parryana (3 members)
- Arctostaphylos pringlei (2 members)
- Arctostaphylos stanfordiana (3 members)
- Arctostaphylos tomentosa (4 members)
- Arctostaphylos viscida (3 members)
- Arctotheca (1 member)
- Arctotis (2 members)
- Arctous (2 members)
- Ardisia (4 members)
- Area (2 members)
- Arecaceae (6 members)
- Arecaceae (tribe Areceae) subtribe Dypsidinae (2 members)
- Arecaceae (tribe Areceae) subtribe Ptychospermatinae (2 members)
- Arecaceae (tribe Areceae) subtribe Roystoneinae (2 members)
- Arecaceae (tribe Cocoeae) subtribe Bactridinae (2 members)
- Arecaceae (tribe Cocoeae) subtribe Butiinae (4 members)
- Arecaceae (tribe Cocoeae) subtribe Elaeidinae (2 members)
- Arecaceae (tribe Corypheae) subtribe Livistoninae (8 members)
- Arecaceae (tribe Corypheae) subtribe Sabalinae (2 members)
- Arecaceae (tribe Corypheae) subtribe Thrinacinae (6 members)
- Arecaceae subfam. Arecoideae (6 members)
- Arecaceae subfam. Ceroxyloideae (4 members)
- Arecaceae subfam. Coryphoideae (4 members)
- Arecaceae tribe Areceae (6 members)
- Arecaceae tribe Caryoteae (2 members)
- Arecaceae tribe Cocoeae (6 members)
- Arecaceae tribe Corypheae (6 members)
- Arecaceae tribe Cyclospatheae (2 members)
- Arecaceae tribe Hyophorbeae (2 members)
- Arecaceae tribe Phoeniceae (2 members)
- Arenaria (11 members)
- Arenaria lanuginosa (2 members)
- Arenaria serpyllifolia (2 members)
- Arethusa (1 member)
- Argemone (20 members)
- Argemone albiflora (2 members)
- Argemone corymbosa (2 members)
- Argemone munita (4 members)
- Argemone pleiacantha (3 members)
- Argemone squarrosa (2 members)
- Argyranthemum (1 member)
- Argyreia (1 member)
- Argyrochosma (7 members)
- Argyrochosma limitanea (2 members)
- Argythamnia (14 members)
- Argythamnia brandegeei (1 member)
- Argythamnia mercurialina (2 members)
- Arida (6 members)
- Ariocarpus (2 members)
- Ariocarpus fissuratus (1 member)
- Arisaema (2 members)
- Aristida (35 members)
- Aristida californica (2 members)
- Aristida dichotoma (2 members)
- Aristida longespica (2 members)
- Aristida purpurascens (3 members)
- Aristida purpurea (7 members)
- Aristida ternipes (2 members)
- Aristocapsa (1 member)
- Aristolochia (12 members)
- Aristolochiaceae (6 members)
- Arivela (1 member)
- Armeria (2 members)
- Armeria maritima (4 members)
- Armoracia (1 member)
- Arnica (29 members)
- Arnica angustifolia (2 members)
- Arnica griscomii (2 members)
- Arnica lanceolata (2 members)
- Arnoglossum (8 members)
- Arnoseris (1 member)
- Aronia (2 members)
- Arrangement (6 members)
- Arrhenatherum (1 member)
- Arrhenopterum (1 member)
- Artemisia (8 members)
- Artemisia arbuscula (3 members)
- Artemisia borealis (2 members)
- Artemisia campestris (3 members)
- Artemisia cana (3 members)
- Artemisia globularia (2 members)
- Artemisia laciniata (2 members)
- Artemisia ludoviciana (6 members)
- Artemisia norvegica (1 member)
- Artemisia subg. Absinthium (5 members)
- Artemisia subg. Artemisia (31 members)
- Artemisia subg. Drancunculus (10 members)
- Artemisia subg. Tridentatae (14 members)
- Artemisia tridentata (4 members)
- Artemisia tripartita (2 members)
- Arthraxon (1 member)
- Arthrocnemum (1 member)
- Aruncus (2 members)
- Aruncus dioicus (4 members)
- Arundinaria (3 members)
- Arundo (1 member)
- Asanthus (1 member)
- Asarum (6 members)
- Aschisma (1 member)
- Asclepias (82 members)
- Asclepias asperula (2 members)
- Asclepias californica (2 members)
- Asclepias cryptoceras (2 members)
- Asclepias incarnata (2 members)
- Asclepias tuberosa (3 members)
- Asemeia (1 member)
- Asimina (9 members)
- Asimina longifolia (2 members)
- Asparagus (4 members)
- Asphodelus (1 member)
- Aspicarpa (2 members)
- Aspidotis (3 members)
- Aspleniaceae (2 members)
- Asplenium (33 members)
- Asplenium scolopendrium (1 member)
- Asplenium trichomanes (2 members)
- Aster (3 members)
- Aster alpinus (1 member)
- Asteraceae (28 members)
- Asteraceae (tribe Heliantheae) subtribe Ambrosiinae (22 members)
- Asteraceae (tribe Heliantheae) subtribe Baeriinae (14 members)
- Asteraceae (tribe Heliantheae) subtribe Chaenactidinae (38 members)
- Asteraceae (tribe Heliantheae) subtribe Clappiinae (4 members)
- Asteraceae (tribe Heliantheae) subtribe Coreopsidinae (14 members)
- Asteraceae (tribe Heliantheae) subtribe Dimeresiinae (2 members)
- Asteraceae (tribe Heliantheae) subtribe Ecliptinae (62 members)
- Asteraceae (tribe Heliantheae) subtribe Flaveriinae (6 members)
- Asteraceae (tribe Heliantheae) subtribe Gaillardiinae (22 members)
- Asteraceae (tribe Heliantheae) subtribe Galinsoginae (8 members)
- Asteraceae (tribe Heliantheae) subtribe Guardiolinae (2 members)
- Asteraceae (tribe Heliantheae) subtribe Helianthinae (16 members)
- Asteraceae (tribe Heliantheae) subtribe Hymenopappinae (2 members)
- Asteraceae (tribe Heliantheae) subtribe Jaumeinae (2 members)
- Asteraceae (tribe Heliantheae) subtribe Madiinae (40 members)
- Asteraceae (tribe Heliantheae) subtribe Marshalliinae (2 members)
- Asteraceae (tribe Heliantheae) subtribe Melampodiinae (6 members)
- Asteraceae (tribe Heliantheae) subtribe Milleriinae (2 members)
- Asteraceae (tribe Heliantheae) subtribe Pectidinae (18 members)
- Asteraceae (tribe Heliantheae) subtribe Peritylinae (4 members)
- Asteraceae (tribe Heliantheae) subtribe Polymniinae (2 members)
- Asteraceae (tribe Heliantheae) subtribe Rudbeckiinae (4 members)
- Asteraceae (tribe Heliantheae) subtribe Varillinae (2 members)
- Asteraceae (tribe Heliantheae) subtribe Zaluzaniinae (2 members)
- Asteraceae tribe Anthemideae (52 members)
- Asteraceae tribe Arctotideae (6 members)
- Asteraceae tribe Astereae (154 members)
- Asteraceae tribe Calenduleae (8 members)
- Asteraceae tribe Cardueae (34 members)
- Asteraceae tribe Cichorieae (98 members)
- Asteraceae tribe Eupatorieae (54 members)
- Asteraceae tribe Gnaphalieae (38 members)
- Asteraceae tribe Heliantheae (48 members)
- Asteraceae tribe Inuleae (6 members)
- Asteraceae tribe Mutisieae (14 members)
- Asteraceae tribe Plucheeae (6 members)
- Asteraceae tribe Senecioneae (58 members)
- Asteraceae tribe Vernonieae (12 members)
- Astilbe (1 member)
- Astraea (1 member)
- Astranthium (3 members)
- Astrolepis (6 members)
- Astrolepis cochisensis (3 members)
- Astrolepis sinuata (2 members)
- Astrophytum (1 member)
- Atamisquea (1 member)
- Athyrium (5 members)
- Athyrium alpestre (0 members)
- Athyrium distentifolium (1 member)
- Athyrium filix-femina (4 members)
- Athysanus (2 members)
- Atrichoseris (1 member)
- Atrichum (9 members)
- Atriplex (6 members)
- Atriplex acanthocarpa (2 members)
- Atriplex argentea (5 members)
- Atriplex canescens (4 members)
- Atriplex cordulata (2 members)
- Atriplex coronata (3 members)
- Atriplex elegans (2 members)
- Atriplex gardneri (7 members)
- Atriplex garrettii (2 members)
- Atriplex glabriuscula (3 members)
- Atriplex gmelinii (2 members)
- Atriplex parishii (5 members)
- Atriplex powellii (2 members)
- Atriplex saccaria (3 members)
- Atriplex sect. Atriplex (1 member)
- Atriplex sect. Covilleiae (1 member)
- Atriplex sect. Dialysex (2 members)
- Atriplex sect. Endolepis (1 member)
- Atriplex sect. Obione (18 members)
- Atriplex sect. Phyllostegiae (1 member)
- Atriplex sect. Pleianthae (1 member)
- Atriplex sect. Sclerocalymma (3 members)
- Atriplex sect. Semibaccata (2 members)
- Atriplex sect. Spongiocarpus (2 members)
- Atriplex sect. Teutliopsis (12 members)
- Atriplex serenana (2 members)
- Atriplex subg. Atriplex (12 members)
- Atriplex subg. Obione (10 members)
- Atriplex subg. Pterochiton (19 members)
- Atriplex subsect. Arenariae (10 members)
- Atriplex subsect. Argenteae (5 members)
- Atriplex subsect. Californicae (3 members)
- Atriplex subsect. Graciliflorae (1 member)
- Atriplex subsect. Leucophyllae (1 member)
- Atriplex subsect. Pusillae (8 members)
- Atriplex subsect. Saccariae (2 members)
- Atriplex subsect. Truncatae (1 member)
- Atriplex subsect. Wolfianae (2 members)
- Atriplex torreyi (2 members)
- Atriplex wolfii (2 members)
- Atropa (1 member)
- Aubrieta (1 member)
- Aucuba (1 member)
- Aulacomniaceae (4 members)
- Aulacomnium (4 members)
- Aureolaria (7 members)
- Aurinia (2 members)
- Austrostipa (2 members)
- Avena (6 members)
- Avenula (2 members)
- Axonopus (4 members)
- Axyris (1 member)
- Ayenia (7 members)
- Azolla (3 members)
- Azollaceae (2 members)
- Baccharis (24 members)
- Baccharis pilularis (2 members)
- Baccharis plummerae (2 members)
- Bacopa (7 members)
- Bahia (4 members)
- Bahiopsis (3 members)
- Baileya (3 members)
- Balduina (3 members)
- Balsamorhiza (4 members)
- Balsamorhiza subg. Artorhiza (3 members)
- Balsamorhiza subg. Balsamorhiza (9 members)
- Bambusa (4 members)
- Barbarea (4 members)
- Barbella (1 member)
- Barbula (8 members)
- Barbula convoluta (3 members)
- Barbula indica (2 members)
- Barkleyanthus (1 member)
- Bartlettia (1 member)
- Bartonia (4 members)
- Bartonia paniculata (3 members)
- Bartramia (7 members)
- Bartramiaceae (10 members)
- Bartramiopsis (1 member)
- Bartsia (1 member)
- Basellaceae (2 members)
- Basiphyllaea (1 member)
- Bassia (2 members)
- Bastardia (1 member)
- Bataceae (2 members)
- Batesimalva (1 member)
- Batis (1 member)
- Bebbia (2 members)
- Bebbia juncea (1 member)
- Beckmannia (1 member)
- Begonia (2 members)
- Begoniaceae (2 members)
- Bejaria (1 member)
- Belamcanda (1 member)
- Bellardia (3 members)
- Bellibarbula (1 member)
- Bellis (1 member)
- Beloglottis (1 member)
- Benitoa (1 member)
- Bensoniella (1 member)
- Berberidaceae (16 members)
- Berberis (23 members)
- Berberis pinnata (2 members)
- Berchemia (1 member)
- Bergerocactus (1 member)
- Bergia (1 member)
- Berlandiera (8 members)
- Bernardia (3 members)
- Berteroa (1 member)
- Bestia (1 member)
- Beta (2 members)
- Beta vulgaris (2 members)
- Betula (20 members)
- Betula nana (2 members)
- Betula pubescens (2 members)
- Betulaceae (4 members)
- Betulaceae subfam. Betuloideae (4 members)
- Betulaceae subfam. Coryloideae (6 members)
- Bidens (25 members)
- Bigelowia (3 members)
- Bigelowia nudata (2 members)
- Billieturnera (1 member)
- Bischofia (1 member)
- Bistorta (4 members)
- Blechnaceae (4 members)
- Blechnum (4 members)
- Blechnum occidentale (1 member)
- Blennosperma (3 members)
- Blennosperma nanum (2 members)
- Blepharidachne (2 members)
- Blepharipappus (1 member)
- Blepharizonia (2 members)
- Blepharoneuron (1 member)
- Bletia (2 members)
- Blindia (1 member)
- Bloomeria (4 members)
- Bloomeria crocea (3 members)
- Blutaparon (1 member)
- Blysmopsis (1 member)
- Blyxa (1 member)
- Boechera (111 members)
- Boechera breweri (2 members)
- Boechera fernaldiana (2 members)
- Boehmeria (2 members)
- Boerhavia (17 members)
- Boerhavia coulteri (2 members)
- Bolandra (2 members)
- Bolboschoenus (6 members)
- Bolboschoenus maritimus (2 members)
- Boltonia (7 members)
- Boltonia asteroides (3 members)
- Boltonia diffusa (2 members)
- Bommeria (1 member)
- Bonamia (2 members)
- Bonellia (2 members)
- Bonellia macrocarpa (1 member)
- Bontia (1 member)
- Borrichia (3 members)
- Boschniakia (1 member)
- Bothriochloa (12 members)
- Botrychium (6 members)
- Botrychium lanceolatum (2 members)
- Botrychium sect. Hiemobotrychium (1 member)
- Botrychium sect. Sceptridium (6 members)
- Botrychium subg. Botrychium (23 members)
- Botrychium subg. Osmundopteris (1 member)
- Botrychium subg. Sceptridium (4 members)
- Bouchetia (1 member)
- Bouteloua (4 members)
- Bouteloua aristidoides (2 members)
- Bouteloua barbata (2 members)
- Bouteloua curtipendula (2 members)
- Bouteloua hirsuta (2 members)
- Bouteloua subg. Bouteloua (11 members)
- Bouteloua subg. Chondrosum (13 members)
- Bouteloua trifida (2 members)
- Boykinia (6 members)
- Brachelyma (1 member)
- Brachychiton (1 member)
- Brachydontium (2 members)
- Brachyelytrum (2 members)
- Brachymenium (2 members)
- Brachypodium (5 members)
- Brachystigma (1 member)
- Brachytheciaceae (38 members)
- Brachytheciastrum (7 members)
- Brachytheciastrum velutinum (2 members)
- Brachythecium (22 members)
- Brachythecium erythrorrhizon (2 members)
- Bradburia (2 members)
- Brandegea (1 member)
- Brasenia (1 member)
- Brassia (1 member)
- Brassica (8 members)
- Brassicaceae (63 members)
- Brassicaceae tribe Alysseae (6 members)
- Brassicaceae tribe Anchonieae (2 members)
- Brassicaceae tribe Aphragmeae (2 members)
- Brassicaceae tribe Arabideae (8 members)
- Brassicaceae tribe Boechereae (14 members)
- Brassicaceae tribe Brassiceae (26 members)
- Brassicaceae tribe Buniadeae (2 members)
- Brassicaceae tribe Calepineae (2 members)
- Brassicaceae tribe Camelineae (12 members)
- Brassicaceae tribe Cardamineae (20 members)
- Brassicaceae tribe Chorisporeae (4 members)
- Brassicaceae tribe Cochlearieae (2 members)
- Brassicaceae tribe Conringieae (2 members)
- Brassicaceae tribe Descurainieae (6 members)
- Brassicaceae tribe Erysimeae (2 members)
- Brassicaceae tribe Euclidieae (6 members)
- Brassicaceae tribe Eutremeae (2 members)
- Brassicaceae tribe Halimolobeae (4 members)
- Brassicaceae tribe Hesperideae (2 members)
- Brassicaceae tribe Iberideae (4 members)
- Brassicaceae tribe Isatideae (4 members)
- Brassicaceae tribe Lepidieae (2 members)
- Brassicaceae tribe Lunarieae (2 members)
- Brassicaceae tribe Malcolmieae (2 members)
- Brassicaceae tribe Noccaeeae (4 members)
- Brassicaceae tribe Physarieae (14 members)
- Brassicaceae tribe Sisymbrieae (2 members)
- Brassicaceae tribe Smelowskieae (2 members)
- Brassicaceae tribe Thelypodieae (28 members)
- Brassicaceae tribe Thlaspideae (4 members)
- Braunia (2 members)
- Braya (10 members)
- Braya glabella (3 members)
- Braya humilis (4 members)
- Braya thorild-wulffii (2 members)
- Breynia (1 member)
- Brickellia (40 members)
- Brickellia atractyloides (3 members)
- Brickellia coulteri (2 members)
- Brickellia eupatorioides (6 members)
- Brickellia hinckleyi (2 members)
- Brickellia lemmonii (2 members)
- Brickellia longifolia (2 members)
- Brickellia microphylla (2 members)
- Brickellia oblongifolia (2 members)
- Brickelliastrum (1 member)
- Brintonia (1 member)
- Briza (3 members)
- Brodiaea (18 members)
- Brodiaea californica (2 members)
- Brodiaea coronaria (2 members)
- Brodiaea elegans (2 members)
- Brodiaea terrestris (2 members)
- Bromeliaceae (8 members)
- Bromidium (1 member)
- Bromus (10 members)
- Bromus carinatus (2 members)
- Bromus catharticus (2 members)
- Bromus hordeaceus (4 members)
- Bromus pumpellianus (2 members)
- Bromus sect. Bromopsis (26 members)
- Bromus sect. Bromus (15 members)
- Bromus sect. Ceratochloa (9 members)
- Bromus sect. Genea (5 members)
- Bromus sect. Neobromus (1 member)
- Brosimum (1 member)
- Brothera (1 member)
- Brotherella (4 members)
- Broussonetia (1 member)
- Browallia (2 members)
- Bruchia (10 members)
- Bruchiaceae (4 members)
- Brunnichia (1 member)
- Bryaceae (24 members)
- Bryhnia (3 members)
- Bryoandersonia (1 member)
- Bryobrittonia (1 member)
- Bryocrumia (1 member)
- Bryoerythrophyllum (4 members)
- Bryolawtonia (1 member)
- Bryonia (2 members)
- Bryophyllum (5 members)
- Bryophyta (81 members)
- Bryoxiphiaceae (2 members)
- Bryoxiphium (1 member)
- Bryum (8 members)
- Bryum argenteum (3 members)
- Buchloë (1 member)
- Buchnera (3 members)
- Buckiella (1 member)
- Bucklandiella (8 members)
- Bucklandiella macounii (2 members)
- Bucklandiella sect. Laevifoliae (5 members)
- Bucklandiella sect. Lawtonia (1 member)
- Bucklandiella sect. Marginatae (2 members)
- Bucklandiella sect. Sudeticae (5 members)
- Buckleya (1 member)
- Buddleja (11 members)
- Buddleja racemosa (2 members)
- Bulbophyllum (1 member)
- Bulbostylis (9 members)
- Bulbostylis ciliatifolia (2 members)
- Bunias (2 members)
- Burmannia (3 members)
- Burmanniaceae (6 members)
- Butomaceae (2 members)
- Butomus (1 member)
- Buxaceae (4 members)
- Buxbaumia (4 members)
- Buxbaumiaceae (2 members)
- Buxus (1 member)
- Byrsonima (1 member)
- Cabomba (1 member)
- Cabombaceae (4 members)
- Cacaliopsis (1 member)
- Cactaceae (6 members)
- Cactaceae subfam. Cactoideae (56 members)
- Cactaceae subfam. Opuntioideae (10 members)
- Cactaceae subfam. Pereskioideae (2 members)
- Cakile (8 members)
- Cakile edentula (4 members)
- Cakile lanceolata (3 members)
- Cakile maritima (1 member)
- Calamagrostis (29 members)
- Calamagrostis canadensis (3 members)
- Calamagrostis porteri (2 members)
- Calamagrostis stricta (2 members)
- Calamovilfa (6 members)
- Calamovilfa longifolia (2 members)
- Calandrinia (2 members)
- Calendula (2 members)
- Calepina (1 member)
- Calibrachoa (1 member)
- Calla (1 member)
- Callaeum (1 member)
- Callicladium (1 member)
- Callicostella (1 member)
- Calliergon (5 members)
- Calliergonaceae (14 members)
- Calliergonella (1 member)
- Calliphysalis (1 member)
- Callirhoë (10 members)
- Callirhoë involucrata (2 members)
- Callisia (7 members)
- Callitriche (14 members)
- Callitriche brutia (1 member)
- Callitris (1 member)
- Calluna (1 member)
- Calocedrus (1 member)
- Calochortus (64 members)
- Calochortus clavatus (5 members)
- Calochortus elegans (3 members)
- Calochortus gunnisonii (2 members)
- Calochortus kennedyi (2 members)
- Calochortus longebarbatus (2 members)
- Calochortus macrocarpus (2 members)
- Calochortus palmeri (2 members)
- Calochortus weedii (3 members)
- Calophyllaceae (4 members)
- Calophyllum (1 member)
- Calopogon (6 members)
- Calopogon tuberosus (2 members)
- Caltha (3 members)
- Calycadenia (10 members)
- Calycanthaceae (2 members)
- Calycanthus (3 members)
- Calycanthus floridus (2 members)
- Calycocarpum (1 member)
- Calycoseris (2 members)
- Calydorea (1 member)
- Calymperaceae (4 members)
- Calymperes (5 members)
- Calypso (2 members)
- Calypso bulbosa (2 members)
- Calyptocarpus (1 member)
- Calyptranthes (2 members)
- Calystegia (31 members)
- Calystegia atriplicifolia (2 members)
- Calystegia catesbeiana (2 members)
- Calystegia collina (5 members)
- Calystegia macrostegia (6 members)
- Calystegia malacophylla (2 members)
- Calystegia occidentalis (2 members)
- Calystegia purpurata (2 members)
- Calystegia sepium (6 members)
- Calystegia silvatica (2 members)
- Calystegia spithamaea (3 members)
- Calystegia subacaulis (2 members)
- Camassia (8 members)
- Camassia leichtlinii (2 members)
- Camassia quamash (8 members)
- Camelina (4 members)
- Camissonia (14 members)
- Camissonia campestris (2 members)
- Camissonia kernensis (2 members)
- Camissonia sierrae (2 members)
- Camissoniopsis (16 members)
- Camissoniopsis cheiranthifolia (2 members)
- Camissoniopsis guadalupensis (1 member)
- Camissoniopsis pallida (2 members)
- Campyliadelphus (1 member)
- Campylium (4 members)
- Campylocentrum (1 member)
- Campyloneurum (4 members)
- Campylophyllum (3 members)
- Campylopodiella (2 members)
- Campylopus (18 members)
- Campylopus atrovirens (2 members)
- Campylostelium (1 member)
- Canadanthus (1 member)
- Canbya (2 members)
- Canella (1 member)
- Canellaceae (2 members)
- Canna (3 members)
- Cannabaceae (4 members)
- Cannabis (1 member)
- Cannaceae (2 members)
- Canotia (1 member)
- Caperonia (2 members)
- Capparaceae (6 members)
- Capraria (2 members)
- Capsella (1 member)
- Capsicum (2 members)
- Capsicum annuum (1 member)
- Cardamine (39 members)
- Cardionema (1 member)
- Carduus (7 members)
- Carduus acanthoides (1 member)
- Carduus pycnocephalus (1 member)
- Carex (140 members)
- Carex albicans (3 members)
- Carex aquatilis (4 members)
- Carex atlantica (2 members)
- Carex bigelowii (2 members)
- Carex bromoides (2 members)
- Carex brunnescens (2 members)
- Carex canescens (2 members)
- Carex communis (2 members)
- Carex crinita (2 members)
- Carex debilis (2 members)
- Carex deflexa (2 members)
- Carex deweyana (2 members)
- Carex digitalis (3 members)
- Carex divulsa (1 member)
- Carex echinata (2 members)
- Carex filifolia (2 members)
- Carex fissa (2 members)
- Carex glareosa (2 members)
- Carex inops (2 members)
- Carex laxiculmis (2 members)
- Carex lenticularis (5 members)
- Carex lucorum (2 members)
- Carex luzulina (2 members)
- Carex magellanica (1 member)
- Carex microchaeta (2 members)
- Carex microglochin (1 member)
- Carex muehlenbergii (2 members)
- Carex muricata (1 member)
- Carex parallela (1 member)
- Carex petricosa (2 members)
- Carex scirpoidea (4 members)
- Carex scoparia (2 members)
- Carex scopulorum (3 members)
- Carex sect. Acrocystis (26 members)
- Carex sect. Albae (2 members)
- Carex sect. Ammoglochin (2 members)
- Carex sect. Anomalae (2 members)
- Carex sect. Aulocystis (10 members)
- Carex sect. Bicolores (4 members)
- Carex sect. Capituligerae (1 member)
- Carex sect. Carex (5 members)
- Carex sect. Careyanae (10 members)
- Carex sect. Ceratocystis (6 members)
- Carex sect. Chlorostachyae (3 members)
- Carex sect. Chordorrhizae (1 member)
- Carex sect. Circinatae (2 members)
- Carex sect. Clandestinae (4 members)
- Carex sect. Collinsiae (1 member)
- Carex sect. Cyperoideae (1 member)
- Carex sect. Deweyanae (8 members)
- Carex sect. Dispermae (1 member)
- Carex sect. Divisae (6 members)
- Carex sect. Dornera (2 members)
- Carex sect. Filifoliae (4 members)
- Carex sect. Firmiculmes (3 members)
- Carex sect. Foetidae (4 members)
- Carex sect. Glareosae (19 members)
- Carex sect. Glaucescentes (3 members)
- Carex sect. Granulares (4 members)
- Carex sect. Griseae (20 members)
- Carex sect. Hallerianae (4 members)
- Carex sect. Heleoglochin (4 members)
- Carex sect. Hirtifoliae (1 member)
- Carex sect. Hispidae (1 member)
- Carex sect. Holarrhenae (2 members)
- Carex sect. Hymenochlaenae (21 members)
- Carex sect. Inflatae (3 members)
- Carex sect. Lamprochlaenae (3 members)
- Carex sect. Laxiflorae (15 members)
- Carex sect. Leptocephalae (1 member)
- Carex sect. Leucoglochin (3 members)
- Carex sect. Limosae (7 members)
- Carex sect. Longicaules (1 member)
- Carex sect. Lupulinae (6 members)
- Carex sect. Macrocephalae (2 members)
- Carex sect. Mitratae (1 member)
- Carex sect. Multiflorae (8 members)
- Carex sect. Nardinae (1 member)
- Carex sect. Obtusatae (1 member)
- Carex sect. Ovales (75 members)
- Carex sect. Paludosae (14 members)
- Carex sect. Paniceae (10 members)
- Carex sect. Phacocystis (36 members)
- Carex sect. Phaestoglochin (28 members)
- Carex sect. Phyllostachyae (10 members)
- Carex sect. Physoglochin (3 members)
- Carex sect. Pictae (2 members)
- Carex sect. Porocystis (8 members)
- Carex sect. Racemosae (29 members)
- Carex sect. Rhynchocystis (1 member)
- Carex sect. Rostrales (4 members)
- Carex sect. Rupestres (1 member)
- Carex sect. Schiedeanae (1 member)
- Carex sect. Scirpinae (4 members)
- Carex sect. Scitae (5 members)
- Carex sect. Shortianae (1 member)
- Carex sect. Spirostachyae (3 members)
- Carex sect. Squarrosae (4 members)
- Carex sect. Stellulatae (10 members)
- Carex sect. Thuringiaca (1 member)
- Carex sect. Triquetrae (1 member)
- Carex sect. Vesicariae (19 members)
- Carex sect. Vulpinae (10 members)
- Carex stipata (2 members)
- Carex supina (1 member)
- Carex tenera (2 members)
- Carex tonsa (2 members)
- Carex tribuloides (2 members)
- Carex viridula (6 members)
- Carica (1 member)
- Caricaceae (2 members)
- Carissa (1 member)
- Carlina (2 members)
- Carlina vulgaris (1 member)
- Carlquistia (1 member)
- Carminatia (1 member)
- Carnegiea (1 member)
- Carpenteria (1 member)
- Carphephorus (8 members)
- Carphephorus odoratissimus (2 members)
- Carphochaete (1 member)
- Carpinus (2 members)
- Carpinus caroliniana (2 members)
- Carpobrotus (2 members)
- Carrichtera (1 member)
- Carsonia (1 member)
- Carthamus (4 members)
- Carya (12 members)
- Carya ovata (2 members)
- Caryophyllaceae (8 members)
- Caryophyllaceae subfam. Alsinoideae (32 members)
- Caryophyllaceae subfam. Caryophylloideae (16 members)
- Caryophyllaceae subfam. Paronychioideae (12 members)
- Caryophyllaceae subfam. Polycarpoideae (14 members)
- Caryota (2 members)
- Cascadia (1 member)
- Cassiope (5 members)
- Cassiope mertensiana (4 members)
- Cassiope tetragona (2 members)
- Cassytha (1 member)
- Castanea (3 members)
- Castilleja (139 members)
- Castilleja affinis (3 members)
- Castilleja ambigua (4 members)
- Castilleja angustifolia (3 members)
- Castilleja applegatei (4 members)
- Castilleja campestris (2 members)
- Castilleja densiflora (3 members)
- Castilleja exserta (3 members)
- Castilleja flava (2 members)
- Castilleja hispida (2 members)
- Castilleja martini (2 members)
- Castilleja miniata (4 members)
- Castilleja minor (4 members)
- Castilleja pallescens (2 members)
- Castilleja pallida (2 members)
- Castilleja parviflora (4 members)
- Castilleja pilosa (3 members)
- Castilleja rubicundula (2 members)
- Castilleja scabrida (2 members)
- Castilleja subinclusa (3 members)
- Castilleja tenuiflora (1 member)
- Casuarina (5 members)
- Casuarina cunninghamiana (1 member)
- Casuarina equisetifolia (1 member)
- Casuarinaceae (2 members)
- Catabrosa (1 member)
- Catharanthus (1 member)
- Cathestecum (2 members)
- Catopsis (3 members)
- Catoscopiaceae (2 members)
- Catoscopium (1 member)
- Caulanthus (17 members)
- Caulophyllum (2 members)
- Causonis (1 member)
- Cayaponia (2 members)
- Ceanothus (4 members)
- Ceanothus crassifolius (2 members)
- Ceanothus cuneatus (4 members)
- Ceanothus foliosus (3 members)
- Ceanothus gloriosus (3 members)
- Ceanothus impressus (2 members)
- Ceanothus jepsonii (2 members)
- Ceanothus megacarpus (2 members)
- Ceanothus oliganthus (3 members)
- Ceanothus prostratus (2 members)
- Ceanothus subg. Ceanothus (33 members)
- Ceanothus subg. Cerastes (29 members)
- Ceanothus tomentosus (2 members)
- Ceanothus velutinus (2 members)
- Celastraceae (24 members)
- Celastrus (2 members)
- Celosia (5 members)
- Celtica (1 member)
- Celtis (6 members)
- Cenchrus (8 members)
- Centaurea (22 members)
- Centaurea stoebe (1 member)
- Centaurea virgata (1 member)
- Centaurium (3 members)
- Centratherum (1 member)
- Centromadia (5 members)
- Centromadia parryi (4 members)
- Centromadia pungens (2 members)
- Centrostegia (1 member)
- Cephalanthera (1 member)
- Cerastium (32 members)
- Cerastium alpinum (2 members)
- Cerastium arvense (2 members)
- Cerastium fontanum (2 members)
- Cerastium nutans (2 members)
- Cerastium velutinum (2 members)
- Ceratiola (1 member)
- Ceratodon (3 members)
- Ceratodon purpureus (3 members)
- Ceratophyllaceae (2 members)
- Ceratophyllum (4 members)
- Ceratophyllum muricatum (1 member)
- Ceratopteris (3 members)
- Ceratotheca (1 member)
- Cercocarpus (6 members)
- Cercocarpus betuloides (3 members)
- Cercocarpus ledifolius (3 members)
- Cervantesiaceae (2 members)
- Cestrum (3 members)
- Cevallia (1 member)
- Chaenactis (6 members)
- Chaenactis carphoclinia (2 members)
- Chaenactis douglasii (2 members)
- Chaenactis glabriuscula (5 members)
- Chaenactis sect. Acarphaea (3 members)
- Chaenactis sect. Chaenactis (8 members)
- Chaenactis sect. Macrocarphus (9 members)
- Chaenomeles (2 members)
- Chaenorhinum (2 members)
- Chaenorhinum minus (1 member)
- Chaetadelpha (1 member)
- Chaetopappa (9 members)
- Chaetopappa asteroides (2 members)
- Chamaebatia (2 members)
- Chamaebatiaria (1 member)
- Chamaechaenactis (1 member)
- Chamaecyparis (3 members)
- Chamaedaphne (1 member)
- Chamaedorea (1 member)
- Chamaelirium (1 member)
- Chamaemelum (2 members)
- Chamaenerion (3 members)
- Chamaenerion angustifolium (2 members)
- Chamaerhodos (1 member)
- Chamaesaracha (8 members)
- Chamelaucium (1 member)
- Chaptalia (3 members)
- Chasmanthe (1 member)
- Chasmanthium (5 members)
- Cheilanthes (28 members)
- Cheiroglossa (1 member)
- Chelidonium (1 member)
- Chelone (5 members)
- Chelone obliqua (3 members)
- Chenia (1 member)
- Chenopodiaceae (54 members)
- Chenopodium (4 members)
- Chenopodium berlandieri (6 members)
- Chenopodium capitatum (2 members)
- Chenopodium glaucum (2 members)
- Chenopodium incanum (3 members)
- Chenopodium polyspermum (2 members)
- Chenopodium rubrum (2 members)
- Chenopodium sect. Agathophytum (2 members)
- Chenopodium sect. Blitum (3 members)
- Chenopodium sect. Chenopodium (16 members)
- Chenopodium sect. Degenia (1 member)
- Chenopodium sect. Glauca (2 members)
- Chenopodium sect. Grossefoveata (1 member)
- Chenopodium sect. Pseudoblitum (3 members)
- Chenopodium subg. Blitum (10 members)
- Chenopodium subg. Chenopodium (4 members)
- Chenopodium subsect. Chenopodium (4 members)
- Chenopodium subsect. Favosa (5 members)
- Chenopodium subsect. Fremontia (5 members)
- Chenopodium subsect. Leptophylla (9 members)
- Chenopodium subsect. Polysperma (2 members)
- Chenopodium subsect. Standleyana (1 member)
- Chenopodium subsect. Undata (1 member)
- Chenopodium subsect. Urbica (1 member)
- Chimaphila (4 members)
- Chimaphila umbellata (1 member)
- Chionodoxa (1 member)
- Chionophila (2 members)
- Chloracantha (2 members)
- Chloracantha spinosa (1 member)
- Chloris (19 members)
- Chloris canterae (2 members)
- Chlorocrambe (1 member)
- Chlorogalum (7 members)
- Chlorogalum pomeridianum (3 members)
- Chlorogalum purpureum (2 members)
- Chloropyron (6 members)
- Chloropyron maritimum (3 members)
- Chloropyron molle (2 members)
- Chondrilla (1 member)
- Chorisiva (1 member)
- Chorispora (1 member)
- Chorizanthe (6 members)
- Chorizanthe biloba (2 members)
- Chorizanthe brevicornu (2 members)
- Chorizanthe cuspidata (2 members)
- Chorizanthe fimbriata (2 members)
- Chorizanthe parryi (2 members)
- Chorizanthe polygonoides (2 members)
- Chorizanthe pungens (2 members)
- Chorizanthe robusta (2 members)
- Chorizanthe sect. Acanthogonum (6 members)
- Chorizanthe sect. Fragile (2 members)
- Chorizanthe sect. Ptelosepala (32 members)
- Chorizanthe subg. Amphietes (6 members)
- Chorizanthe subg. Eriogonella (1 member)
- Chorizanthe subg. Quintaria (1 member)
- Chorizanthe xanti (2 members)
- Chromolaena (4 members)
- Chrysactinia (1 member)
- Chrysanthemoides (1 member)
- Chryso-hypnum (1 member)
- Chrysobalanaceae (4 members)
- Chrysobalanus (2 members)
- Chrysobalanus icaco (1 member)
- Chrysogonum (2 members)
- Chrysogonum virginianum (3 members)
- Chrysolepis (3 members)
- Chrysolepis chrysophylla (2 members)
- Chrysoma (1 member)
- Chrysophyllum (2 members)
- Chrysophyllum oliviforme (1 member)
- Chrysopogon (4 members)
- Chrysopsis (13 members)
- Chrysopsis gossypina (3 members)
- Chrysopsis linearifolia (2 members)
- Chrysosplenium (6 members)
- Chrysothamnus (10 members)
- Chrysothamnus viscidiflorus (5 members)
- Chylismia (4 members)
- Chylismia brevipes (3 members)
- Chylismia cardiophylla (2 members)
- Chylismia claviformis (10 members)
- Chylismia scapoidea (4 members)
- Chylismia sect. Chylismia (19 members)
- Chylismia sect. Lignothera (3 members)
- Chylismia specicola (2 members)
- Chylismia walkeri (2 members)
- Chylismiella (1 member)
- Cicendia (1 member)
- Cichorium (1 member)
- Cienfuegosia (2 members)
- Cimicifuga (6 members)
- Cinclidium (4 members)
- Cinna (3 members)
- Cinnamomum (1 member)
- Circaea (5 members)
- Circaea alpina (2 members)
- Circaea canadensis (1 member)
- Cirriphyllum (1 member)
- Cirsium (78 members)
- Cirsium arizonicum (5 members)
- Cirsium clavatum (3 members)
- Cirsium cymosum (2 members)
- Cirsium douglasii (2 members)
- Cirsium eatonii (7 members)
- Cirsium edule (3 members)
- Cirsium fontinale (3 members)
- Cirsium horridulum (3 members)
- Cirsium hydrophilum (2 members)
- Cirsium inamoenum (2 members)
- Cirsium occidentale (7 members)
- Cirsium ochrocentrum (2 members)
- Cirsium pulcherrimum (2 members)
- Cirsium pumilum (2 members)
- Cirsium remotifolium (3 members)
- Cirsium scariosum (8 members)
- Cissampelos (1 member)
- Cissus (2 members)
- Cistaceae (10 members)
- Cistanthe (11 members)
- Cistus (5 members)
- Citrullus (4 members)
- Citrullus lanatus (1 member)
- Cladanthus (1 member)
- Cladium (3 members)
- Cladoraphis (1 member)
- Claopodium (4 members)
- Clappia (1 member)
- Clarkia (16 members)
- Clarkia amoena (5 members)
- Clarkia biloba (3 members)
- Clarkia borealis (2 members)
- Clarkia concinna (3 members)
- Clarkia cylindrica (2 members)
- Clarkia gracilis (4 members)
- Clarkia mildrediae (2 members)
- Clarkia purpurea (3 members)
- Clarkia sect. Biortis (1 member)
- Clarkia sect. Clarkia (1 member)
- Clarkia sect. Eucharidium (3 members)
- Clarkia sect. Fibula (4 members)
- Clarkia sect. Godetia (8 members)
- Clarkia sect. Myxocarpa (9 members)
- Clarkia sect. Phaeostoma (14 members)
- Clarkia sect. Rhodanthos (6 members)
- Clarkia speciosa (4 members)
- Clarkia subsect. Connubium (1 member)
- Clarkia subsect. Flexicaules (2 members)
- Clarkia subsect. Heterogaura (1 member)
- Clarkia subsect. Jugales (2 members)
- Clarkia subsect. Lautiflorae (5 members)
- Clarkia subsect. Micranthae (1 member)
- Clarkia subsect. Phaeostoma (5 members)
- Clarkia subsect. Primigenia (4 members)
- Clarkia subsect. Prognatae (1 member)
- Clarkia subsect. Sympherica (4 members)
- Clarkia tembloriensis (2 members)
- Clarkia xantiana (2 members)
- Clasmatodon (1 member)
- Claytonia (29 members)
- Claytonia exigua (2 members)
- Claytonia parviflora (4 members)
- Claytonia perfoliata (3 members)
- Claytonia rubra (2 members)
- Cleistes (2 members)
- Cleistocarpidium (1 member)
- Clematis (8 members)
- Clematis columbiana (2 members)
- Clematis hirsutissima (2 members)
- Clematis occidentalis (3 members)
- Clematis pitcheri (2 members)
- Clematis subg. Atragene (4 members)
- Clematis subg. Clematis (12 members)
- Clematis subg. Viorna (20 members)
- Clematis subg. Viticella (1 member)
- Clematis tangutica (1 member)
- Cleomaceae (24 members)
- Cleome (2 members)
- Cleomella (9 members)
- Cleomella hillmanii (2 members)
- Cleoserrata (2 members)
- Clethra (3 members)
- Clethraceae (2 members)
- Cliftonia (1 member)
- Climaciaceae (2 members)
- Climacium (2 members)
- Clintonia (4 members)
- Clusia (1 member)
- Clusiaceae (2 members)
- Cnidoscolus (3 members)
- Coccinia (1 member)
- Coccoloba (2 members)
- Coccothrinax (1 member)
- Cocculus (2 members)
- Cochlearia (3 members)
- Cochlospermaceae (2 members)
- Cocos (1 member)
- Codriophorus (4 members)
- Codriophorus sect. Codriophorus (6 members)
- Codriophorus sect. Fascicularia (3 members)
- Coeloglossum (1 member)
- Coelophragmus (1 member)
- Coelorachis (4 members)
- Coincya (2 members)
- Coincya monensis (1 member)
- Coix (1 member)
- Coleanthus (1 member)
- Coleogyne (1 member)
- Collinsia (24 members)
- Collinsia bartsiifolia (4 members)
- Collinsia heterophylla (2 members)
- Collinsia sparsiflora (2 members)
- Colocasia (1 member)
- Coloration (12 members)
- Colubrina (10 members)
- Colubrina asiatica (1 member)
- Colubrina cubensis (1 member)
- Columbiadoria (1 member)
- Comandra (2 members)
- Comandra umbellata (3 members)
- Comandraceae (4 members)
- Comarostaphylis (2 members)
- Comarostaphylis diversifolia (2 members)
- Comarum (1 member)
- Comastoma (1 member)
- Combretaceae (10 members)
- Combretum (1 member)
- Commelina (10 members)
- Commelina diffusa (2 members)
- Commelinaceae (12 members)
- Commicarpus (1 member)
- Comptonia (1 member)
- Conardia (1 member)
- Condalia (9 members)
- Condalia globosa (1 member)
- Condalia warnockii (2 members)
- Condition (75 members)
- Conicosia (1 member)
- Coniferophyta (3 members)
- Conimitella (1 member)
- Conocarpus (1 member)
- Conoclinium (4 members)
- Conoclinium betonicifolium (2 members)
- Conopholis (2 members)
- Conostomum (1 member)
- Conringia (1 member)
- Consolea (1 member)
- Consolida (4 members)
- Constancea (1 member)
- Convallaria (2 members)
- Convallaria majalis (2 members)
- Convolvulaceae (36 members)
- Convolvulus (5 members)
- Convolvulus crenatifolius (1 member)
- Conyza (4 members)
- Coptis (4 members)
- Corallorhiza (10 members)
- Corallorhiza maculata (2 members)
- Corallorhiza odontorhiza (2 members)
- Corallorhiza striata (2 members)
- Corchorus (5 members)
- Cordylanthus (19 members)
- Cordylanthus eremicus (2 members)
- Cordylanthus kingii (3 members)
- Cordylanthus pilosus (2 members)
- Cordylanthus rigidus (4 members)
- Cordylanthus tenuis (5 members)
- Cordylanthus wrightii (3 members)
- Corema (1 member)
- Coreocarpus (1 member)
- Coreopsis (16 members)
- Coreopsis sect. Calliopsis (2 members)
- Coreopsis sect. Coreopsis (7 members)
- Coreopsis sect. Eublepharis (4 members)
- Coreopsis sect. Gyrophyllum (6 members)
- Coreopsis sect. Leptosyne (3 members)
- Coreopsis sect. Pugiopappus (3 members)
- Coreopsis sect. Silphidium (1 member)
- Coreopsis sect. Tuckermannia (2 members)
- Corethrogyne (1 member)
- Corispermum (14 members)
- Corispermum americanum (2 members)
- Corispermum hookeri (2 members)
- Corispermum ochotense (2 members)
- Cornaceae (2 members)
- Cornus (12 members)
- Cornus subg. Arctocrania (3 members)
- Cornus subg. Cornus (2 members)
- Cornus subg. Cynoxylon (2 members)
- Cornus subg. Mesomora (1 member)
- Cornus subg. Syncarpea (1 member)
- Cornus subg. Thelycrania (11 members)
- Corrigiola (2 members)
- Corrigiola litoralis (1 member)
- Cortaderia (2 members)
- Corydalis (14 members)
- Corydalis aurea (2 members)
- Corydalis caseana (5 members)
- Corydalis curvisiliqua (2 members)
- Corydalis micrantha (3 members)
- Corylus (4 members)
- Corylus cornuta (2 members)
- Corynephorus (1 member)
- Coryphantha (20 members)
- Coscinodon (5 members)
- Cosmos (4 members)
- Cota (1 member)
- Cotoneaster (34 members)
- Cottea (1 member)
- Cottsia (1 member)
- Cotula (2 members)
- Cotyledon (2 members)
- Cotyledon orbiculata (1 member)
- Count (80 members)
- Crambe (1 member)
- Cranichis (1 member)
- Crassula (12 members)
- Crassula colligata (1 member)
- Crassulaceae (36 members)
- Crataegus (30 members)
- Crataegus (sect. Brevispinae) ser. Brevispinae (1 member)
- Crataegus (sect. Coccineae) ser. Aestivales (3 members)
- Crataegus (sect. Coccineae) ser. Apricae (12 members)
- Crataegus (sect. Coccineae) ser. Bracteatae (2 members)
- Crataegus (sect. Coccineae) ser. Coccineae (4 members)
- Crataegus (sect. Coccineae) ser. Crus-galli (8 members)
- Crataegus (sect. Coccineae) ser. Dilatatae (1 member)
- Crataegus (sect. Coccineae) ser. Greggianae (1 member)
- Crataegus (sect. Coccineae) ser. Intricatae (14 members)
- Crataegus (sect. Coccineae) ser. Lacrimatae (24 members)
- Crataegus (sect. Coccineae) ser. Madrenses (1 member)
- Crataegus (sect. Coccineae) ser. Molles (8 members)
- Crataegus (sect. Coccineae) ser. Parvifoliae (2 members)
- Crataegus (sect. Coccineae) ser. Populneae (8 members)
- Crataegus (sect. Coccineae) ser. Pruinosae (7 members)
- Crataegus (sect. Coccineae) ser. Pulcherrimae (10 members)
- Crataegus (sect. Coccineae) ser. Punctatae (5 members)
- Crataegus (sect. Coccineae) ser. Rotundifoliae (11 members)
- Crataegus (sect. Coccineae) ser. Tenuifoliae (8 members)
- Crataegus (sect. Coccineae) ser. Triflorae (2 members)
- Crataegus (sect. Coccineae) ser. Virides (3 members)
- Crataegus (sect. Crataegus) ser. Apiifoliae (1 member)
- Crataegus (sect. Crataegus) ser. Cordatae (1 member)
- Crataegus (sect. Crataegus) ser. Crataegus (3 members)
- Crataegus (sect. Crataegus) ser. Microcarpae (1 member)
- Crataegus (sect. Douglasia) ser. Cerrones (3 members)
- Crataegus (sect. Douglasia) ser. Douglasianae (5 members)
- Crataegus (sect. Douglasia) ser. Purpureofructus (9 members)
- Crataegus (sect. Macracanthae) ser. Anomalae (4 members)
- Crataegus (sect. Macracanthae) ser. Macracanthae (6 members)
- Crataegus (sect. Sanguineae) ser. Altaicae (2 members)
- Crataegus (sect. Unassigned) ser. Montaninsulae (3 members)
- Crataegus berberifolia (2 members)
- Crataegus chrysocarpa (9 members)
- Crataegus coccinea (3 members)
- Crataegus collina (5 members)
- Crataegus crus-galli (2 members)
- Crataegus margarettae (4 members)
- Crataegus mollis (5 members)
- Crataegus monogyna (1 member)
- Crataegus okanaganensis (2 members)
- Crataegus ouachitensis (2 members)
- Crataegus padifolia (2 members)
- Crataegus pruinosa (6 members)
- Crataegus reverchonii (3 members)
- Crataegus scabrida (4 members)
- Crataegus schuettei (4 members)
- Crataegus sect. Brevispinae (2 members)
- Crataegus sect. Coccineae (40 members)
- Crataegus sect. Crataegus (8 members)
- Crataegus sect. Douglasia (6 members)
- Crataegus sect. Macracanthae (4 members)
- Crataegus sect. Sanguineae (2 members)
- Crataegus sect. Unassigned (2 members)
- Crataegus sheila-phippsiae (2 members)
- Crataegus succulenta (5 members)
- Crataegus texana (2 members)
- Crataegus viridis (6 members)
- Crataegus wattiana (1 member)
- Crataegus ×sicca (2 members)
- Cratoneuron (1 member)
- Crepis (28 members)
- Crepis bakeri (3 members)
- Crepis modocensis (4 members)
- Crepis occidentalis (4 members)
- Crepis runcinata (7 members)
- Cressa (2 members)
- Crinum (5 members)
- Crinum americanum (2 members)
- Crocanthemum (16 members)
- Crocanthemum scoparium (2 members)
- Crocidium (1 member)
- Crocosmia (1 member)
- Croomia (1 member)
- Croptilon (4 members)
- Croptilon hookerianum (3 members)
- Crossidium (6 members)
- Crossidium crassinervium (1 member)
- Crossidium squamiferum (2 members)
- Crossopetalum (2 members)
- Crossosoma (2 members)
- Crossosomataceae (6 members)
- Croton (37 members)
- Croton alabamensis (2 members)
- Croton glandulosus (5 members)
- Croton leucophyllus (1 member)
- Croton lindheimerianus (2 members)
- Croton michauxii (2 members)
- Croton pottsii (2 members)
- Crumia (1 member)
- Crupina (1 member)
- Cryphaea (4 members)
- Cryphaeaceae (6 members)
- Crypsis (3 members)
- Cryptogramma (4 members)
- Cryptostegia (2 members)
- Ctenidium (2 members)
- Ctenitis (2 members)
- Ctenium (2 members)
- Ctenolepis (1 member)
- Cucumis (9 members)
- Cucumis anguria (2 members)
- Cucumis melo (2 members)
- Cucumis sativus (1 member)
- Cucurbita (12 members)
- Cucurbita melopepo (4 members)
- Cucurbita melopepo subsp. melopepo (1 member)
- Cucurbita melopepo subsp. texana (2 members)
- Cucurbita okeechobeensis (1 member)
- Cucurbita pepo (1 member)
- Cucurbitaceae (46 members)
- Cuniculotinus (1 member)
- Cuphea (6 members)
- Cupressaceae (18 members)
- Cupressus (8 members)
- Cupressus guadalupensis (1 member)
- Curcuma (1 member)
- Cuscuta (6 members)
- Cuscuta approximata (1 member)
- Cuscuta californica (3 members)
- Cuscuta chinensis (1 member)
- Cuscuta epithymum (1 member)
- Cuscuta gronovii (3 members)
- Cuscuta indecora (3 members)
- Cuscuta japonica (2 members)
- Cuscuta obtusiflora (1 member)
- Cuscuta pacifica (2 members)
- Cuscuta subg. Cuscuta (6 members)
- Cuscuta subg. Grammica (52 members)
- Cuscuta subg. Monogynella (3 members)
- Cuscuta umbellata (1 member)
- Cusickiella (2 members)
- Cutandia (1 member)
- Cyanthillium (1 member)
- Cycadophyta (1 member)
- Cyclachaena (1 member)
- Cycladenia (2 members)
- Cycladenia humilis (3 members)
- Cyclanthera (4 members)
- Cyclodictyon (1 member)
- Cycloloma (1 member)
- Cyclopogon (2 members)
- Cydonia (1 member)
- Cylindropuntia (27 members)
- Cylindropuntia acanthocarpa (4 members)
- Cylindropuntia bigelovii (1 member)
- Cylindropuntia californica (2 members)
- Cylindropuntia fulgida (2 members)
- Cylindropuntia imbricata (2 members)
- Cymbalaria (2 members)
- Cymbalaria muralis (1 member)
- Cymbopogon (3 members)
- Cymodoceaceae (4 members)
- Cymophyllus (1 member)
- Cynanchum (3 members)
- Cynara (2 members)
- Cynara cardunculus (2 members)
- Cynodon (8 members)
- Cynodon dactylon (2 members)
- Cynodontium (9 members)
- Cynophalla (1 member)
- Cynosurus (2 members)
- Cyperaceae (54 members)
- Cyperus (10 members)
- Cyperus esculentus (3 members)
- Cyperus lupulinus (2 members)
- Cyperus manimae (1 member)
- Cyperus subg. Cyperus (62 members)
- Cyperus subg. Diclidium (2 members)
- Cyperus subg. Juncellus (2 members)
- Cyperus subg. Pycnostachys (22 members)
- Cyperus subg. Pycreus (11 members)
- Cyphomeris (2 members)
- Cypripedium (13 members)
- Cypripedium parviflorum (3 members)
- Cypselea (1 member)
- Cyrilla (1 member)
- Cyrillaceae (4 members)
- Cyrto-hypnum (4 members)
- Cyrtomium (3 members)
- Cyrtomium fortunei (1 member)
- Cyrtomnium (2 members)
- Cyrtopodium (2 members)
- Cystopteris (9 members)
- Dacryophyllum (1 member)
- Dactylis (1 member)
- Dactyloctenium (3 members)
- Dactylorhiza (3 members)
- Dactylorhiza majalis (1 member)
- Dalechampia (1 member)
- Daltonia (1 member)
- Daltoniaceae (2 members)
- Damasonium (1 member)
- Danthonia (8 members)
- Daphne (2 members)
- Darlingtonia (1 member)
- Darmera (1 member)
- Dasiphora (1 member)
- Dasistoma (1 member)
- Dasylirion (3 members)
- Dasyochloa (1 member)
- Dasypyrum (1 member)
- Datisca (1 member)
- Datiscaceae (2 members)
- Datura (8 members)
- Decodon (1 member)
- Decumaria (1 member)
- Dedeckera (1 member)
- Deeringothamnus (2 members)
- Deinandra (17 members)
- Deinandra increscens (2 members)
- Deiregyne (1 member)
- Delairea (1 member)
- Delosperma (1 member)
- Delphinium (4 members)
- Delphinium bicolor (2 members)
- Delphinium californicum (2 members)
- Delphinium carolinianum (4 members)
- Delphinium decorum (2 members)
- Delphinium gypsophilum (2 members)
- Delphinium hansenii (3 members)
- Delphinium hesperium (3 members)
- Delphinium menziesii (2 members)
- Delphinium nuttallii (2 members)
- Delphinium parishii (3 members)
- Delphinium parryi (5 members)
- Delphinium patens (3 members)
- Delphinium sect. Diedropetala (18 members)
- Delphinium sect. Elatopsis (2 members)
- Delphinium subsect. Bicoloria (7 members)
- Delphinium subsect. Depauperata (3 members)
- Delphinium subsect. Echinata (7 members)
- Delphinium subsect. Elata (1 member)
- Delphinium subsect. Exaltata (13 members)
- Delphinium subsect. Grumosa (17 members)
- Delphinium subsect. Multiplex (4 members)
- Delphinium subsect. Subscaposa (13 members)
- Delphinium subsect. Virescens (4 members)
- Delphinium subsect. Wislizenana (5 members)
- Delphinium variegatum (3 members)
- Dendroalsia (1 member)
- Dendromecon (2 members)
- Dendrophylax (1 member)
- Dennstaedtia (3 members)
- Dennstaedtiaceae (8 members)
- Deparia (2 members)
- Deschampsia (9 members)
- Deschampsia cespitosa (3 members)
- Descurainia (16 members)
- Descurainia incisa (2 members)
- Descurainia pinnata (4 members)
- Desmazeria (2 members)
- Deutzia (3 members)
- Diameter (12 members)
- Diamorpha (1 member)
- Dianella (1 member)
- Dianthus (10 members)
- Dianthus armeria (1 member)
- Dianthus barbatus (1 member)
- Dianthus deltoides (1 member)
- Dianthus plumarius (1 member)
- Diapensia (2 members)
- Diapensiaceae (8 members)
- Diaperia (5 members)
- Diaperia prolifera (2 members)
- Diaperia verna (2 members)
- Diarrhena (2 members)
- Dicentra (10 members)
- Dicentra formosa (2 members)
- Dichaetophora (1 member)
- Dichanthelium (26 members)
- Dichanthelium aciculare (4 members)
- Dichanthelium acuminatum (10 members)
- Dichanthelium chamaelonche (2 members)
- Dichanthelium commutatum (4 members)
- Dichanthelium dichotomum (7 members)
- Dichanthelium ensifolium (2 members)
- Dichanthelium oligosanthes (2 members)
- Dichanthelium ovale (4 members)
- Dichanthelium portoricense (2 members)
- Dichanthelium sect. Angustifolia (3 members)
- Dichanthelium sect. Clandestina (3 members)
- Dichanthelium sect. Dichanthelium (3 members)
- Dichanthelium sect. Ensifolia (5 members)
- Dichanthelium sect. Lancearia (2 members)
- Dichanthelium sect. Lanuginosa (5 members)
- Dichanthelium sect. Linearifolia (4 members)
- Dichanthelium sect. Macrocarpa (6 members)
- Dichanthelium sect. Nudicaulia (1 member)
- Dichanthelium sect. Oligosantha (4 members)
- Dichanthelium sect. Pedicellata (2 members)
- Dichanthelium sect. Sphaerocarpa (3 members)
- Dichanthelium sect. Strigosa (3 members)
- Dichanthelium strigosum (3 members)
- Dichanthium (3 members)
- Dichelostemma (6 members)
- Dichelostemma capitatum (2 members)
- Dichelyma (4 members)
- Dichodontium (2 members)
- Dichondra (8 members)
- Dichromanthus (1 member)
- Dicoria (1 member)
- Dicranaceae (34 members)
- Dicranella (11 members)
- Dicranocarpus (1 member)
- Dicranodontium (3 members)
- Dicranopteris (1 member)
- Dicranostegia (1 member)
- Dicranoweisia (2 members)
- Dicranum (28 members)
- Dicranum fuscescens (2 members)
- Dicranum majus (2 members)
- Didiplis (1 member)
- Didymodon (28 members)
- Didymodon rigidulus (5 members)
- Didymodon vinealis (2 members)
- Dieteria (6 members)
- Dieteria asteroides (3 members)
- Dieteria bigelovii (3 members)
- Dieteria canescens (10 members)
- Digitalis (5 members)
- Digitalis purpurea (1 member)
- Digitaria (33 members)
- Digitaria eriantha (2 members)
- Digitaria filiformis (4 members)
- Dimeresia (1 member)
- Dimorphocarpa (3 members)
- Dimorphotheca (2 members)
- Dinebra (1 member)
- Dionaea (1 member)
- Dioscorea (6 members)
- Dioscoreaceae (2 members)
- Diospyros (4 members)
- Diphasiastrum (5 members)
- Diphylleia (1 member)
- Diphysciaceae (2 members)
- Diphyscium (2 members)
- Diplacus (49 members)
- Diplacus bigelovii (2 members)
- Diplazium (3 members)
- Diplotaxis (3 members)
- Dirca (3 members)
- Disceliaceae (2 members)
- Discelium (1 member)
- Dissanthelium (1 member)
- Distance (5 members)
- Distichium (3 members)
- Distichlis (1 member)
- Dithyrea (2 members)
- Ditrichaceae (18 members)
- Ditrichum (11 members)
- Ditrysinia (1 member)
- Dittrichia (1 member)
- Dodecahema (1 member)
- Dodecatheon (20 members)
- Dodecatheon clevelandii (4 members)
- Dodecatheon conjugens (2 members)
- Dodecatheon pulchellum (7 members)
- Doellingeria (4 members)
- Doellingeria umbellata (2 members)
- Donnellia (1 member)
- Donrichardsia (2 members)
- Dopatrium (1 member)
- Doronicum (3 members)
- Dorstenia (1 member)
- Douglasia (9 members)
- Draba (123 members)
- Draba asprella (2 members)
- Draba cuneifolia (3 members)
- Drepanocladus (7 members)
- Drosanthemum (1 member)
- Drosera (8 members)
- Droseraceae (4 members)
- Drummondia (1 member)
- Dryas (9 members)
- Dryas ajanensis (1 member)
- Dryas integrifolia (2 members)
- Drymaria (13 members)
- Drymaria cordata (1 member)
- Drymaria effusa (1 member)
- Drymaria glandulosa (1 member)
- Drymaria leptophylla (1 member)
- Drymocallis (19 members)
- Drymocallis cuneifolia (2 members)
- Drymocallis glandulosa (4 members)
- Drymocallis lactea (2 members)
- Drymocallis pseudorupestris (3 members)
- Dryopetalon (2 members)
- Dryopteridaceae (36 members)
- Dryopteris (15 members)
- Drypetes (2 members)
- Duchesnea (2 members)
- Duchesnea indica (1 member)
- Dudleya (6 members)
- Dudleya abramsii (7 members)
- Dudleya attenuata (1 member)
- Dudleya blochmaniae (2 members)
- Dudleya cymosa (8 members)
- Dudleya saxosa (3 members)
- Dudleya subg. Dudleya (18 members)
- Dudleya subg. Hasseanthus (6 members)
- Dudleya subg. Stylophyllum (8 members)
- Dudleya virens (3 members)
- Dulichium (2 members)
- Dulichium arundinaceum (2 members)
- Dupontia (1 member)
- Dypsis (1 member)
- Dysodiopsis (1 member)
- Dysphania (6 members)
- Dysphania sect. Adenois (4 members)
- Dysphania sect. Botryoides (6 members)
- Dysphania sect. Orthospora (3 members)
- Dysphania subsect. Botrys (1 member)
- Dysphania subsect. Incisa (1 member)
- Dysphania subsect. Teloxys (1 member)
- Dyssodia (1 member)
- Eastwoodia (1 member)
- Eatonella (1 member)
- Ebenaceae (2 members)
- Ecballium (1 member)
- Eccremidium (1 member)
- Echeandia (3 members)
- Echeveria (1 member)
- Echinacea (10 members)
- Echinacea paradoxa (2 members)
- Echinocactus (4 members)
- Echinocactus polycephalus (2 members)
- Echinocereus (27 members)
- Echinocereus enneacanthus (2 members)
- Echinocereus pectinatus (1 member)
- Echinocereus rigidissimus (1 member)
- Echinocereus stramineus (1 member)
- Echinochloa (15 members)
- Echinochloa crus-pavonis (2 members)
- Echinochloa muricata (2 members)
- Echinocystis (1 member)
- Echinodorus (5 members)
- Echinodorus cordifolius (1 member)
- Echinomastus (7 members)
- Echinomastus erectocentrus (2 members)
- Echinomastus intertextus (2 members)
- Echinopepon (2 members)
- Echinophyllum (1 member)
- Echinops (4 members)
- Echinops ritro (1 member)
- Echites (1 member)
- Eclipta (1 member)
- Edgeworthia (1 member)
- Egeria (1 member)
- Egletes (1 member)
- Ehrharta (3 members)
- Eichhornia (2 members)
- Elaeagnaceae (6 members)
- Elaeagnus (5 members)
- Elaeis (1 member)
- Elatinaceae (4 members)
- Elatine (10 members)
- Eleocharis (12 members)
- Eleocharis (sect. Eleocharis) ser. Albidae (1 member)
- Eleocharis (sect. Eleocharis) ser. Eleocharis (25 members)
- Eleocharis (sect. Eleocharis) ser. Melanocarpae (1 member)
- Eleocharis (sect. Eleocharis) ser. Rostellatae (1 member)
- Eleocharis (sect. Eleocharis) ser. Tenuissimae (14 members)
- Eleocharis (sect. Eleogenus) ser. Maculosae (4 members)
- Eleocharis (sect. Eleogenus) ser. Ovatae (6 members)
- Eleocharis compressa (2 members)
- Eleocharis flavescens (2 members)
- Eleocharis mamillata (1 member)
- Eleocharis microcarpa (2 members)
- Eleocharis sect. Eleocharis (10 members)
- Eleocharis sect. Eleogenus (4 members)
- Eleocharis sect. Parvulae (2 members)
- Eleocharis subg. Eleocharis (1 member)
- Eleocharis subg. Limnochloa (7 members)
- Eleocharis subg. Scirpidium (7 members)
- Eleocharis subg. Zinserlingia (4 members)
- Eleocharis tenuis (3 members)
- Elephantopus (4 members)
- Eleusine (4 members)
- Eleusine coracana (2 members)
- Elionurus (2 members)
- Elliottia (2 members)
- Elmera (1 member)
- Elodea (3 members)
- Elodium (3 members)
- Eltroplectris (1 member)
- Elymus (55 members)
- Elymus alaskanus (2 members)
- Elymus canadensis (3 members)
- Elymus elymoides (4 members)
- Elymus glaucus (3 members)
- Elymus lanceolatus (3 members)
- Elymus stebbinsii (2 members)
- Elymus trachycaulus (3 members)
- Elymus virginicus (4 members)
- Embryophyta (304 members)
- Emex (2 members)
- Emilia (2 members)
- Emorya (1 member)
- Empetrum (3 members)
- Encalypta (14 members)
- Encalyptaceae (4 members)
- Encelia (8 members)
- Enceliopsis (3 members)
- Encyclia (1 member)
- Enemion (5 members)
- Engelmannia (1 member)
- Enneapogon (2 members)
- Enteropogon (3 members)
- Entodon (10 members)
- Entodontaceae (2 members)
- Entodontopsis (1 member)
- Entosthodon (12 members)
- Ephedra (12 members)
- Ephedraceae (2 members)
- Ephemeraceae (4 members)
- Ephemerum (5 members)
- Ephemerum crassinervium (2 members)
- Epidendrum (7 members)
- Epifagus (1 member)
- Epigaea (1 member)
- Epilobium (17 members)
- Epilobium canum (3 members)
- Epilobium ciliatum (3 members)
- Epilobium glaberrimum (2 members)
- Epilobium hornemannii (2 members)
- Epilobium sect. Cordylophorum (3 members)
- Epilobium sect. Crossostigma (2 members)
- Epilobium sect. Epilobiopsis (2 members)
- Epilobium sect. Epilobium (30 members)
- Epilobium sect. Macrocarpa (1 member)
- Epilobium sect. Pachydium (3 members)
- Epilobium sect. Xerolobium (1 member)
- Epilobium sect. Zauschneria (3 members)
- Epilobium subsect. Nuttalia (1 member)
- Epilobium subsect. Petrolobium (2 members)
- Epipactis (3 members)
- Epiphyllum (2 members)
- Epiphyllum phyllanthus (1 member)
- Epipterygium (1 member)
- Epithelantha (3 members)
- Epithelantha micromeris (1 member)
- Epixiphium (1 member)
- Equisetaceae (2 members)
- Equisetophyta (1 member)
- Equisetum (4 members)
- Equisetum hyemale (1 member)
- Equisetum ramosissimum (1 member)
- Equisetum subg. Equisetum (11 members)
- Equisetum subg. Hippochaete (8 members)
- Equisetum telmateia (1 member)
- Equisetum variegatum (2 members)
- Eragrostis (53 members)
- Eragrostis ciliaris (2 members)
- Eragrostis mexicana (2 members)
- Eragrostis pectinacea (3 members)
- Eragrostis pilosa (2 members)
- Eranthis (1 member)
- Erechtites (4 members)
- Erechtites hieraciifolius (2 members)
- Eremalche (4 members)
- Eremalche parryi (2 members)
- Eremochloa (2 members)
- Eremocrinum (1 member)
- Eremogone (21 members)
- Eremogone capillaris (2 members)
- Eremogone congesta (9 members)
- Eremogone eastwoodiae (2 members)
- Eremogone franklinii (2 members)
- Eremogone hookeri (2 members)
- Eremogone kingii (2 members)
- Eremogone macradenia (2 members)
- Eremopoa (1 member)
- Eremopyrum (3 members)
- Eremothera (8 members)
- Eremothera boothii (6 members)
- Erica (4 members)
- Ericaceae (12 members)
- Ericaceae subfam. Arbutoideae (12 members)
- Ericaceae subfam. Cassiopoideae (2 members)
- Ericaceae subfam. Ericoideae (28 members)
- Ericaceae subfam. Harrimanelloideae (2 members)
- Ericaceae subfam. Monotropoideae (24 members)
- Ericaceae subfam. Vaccinioideae (24 members)
- Ericameria (40 members)
- Ericameria cooperi (1 member)
- Ericameria cuneata (3 members)
- Ericameria nauseosa (21 members)
- Ericameria palmeri (2 members)
- Ericameria parishii (1 member)
- Ericameria parryi (12 members)
- Erigeron (199 members)
- Erigeron acris (1 member)
- Erigeron aphanactis (2 members)
- Erigeron bellidiastrum (3 members)
- Erigeron bloomeri (2 members)
- Erigeron breweri (5 members)
- Erigeron chrysopsidis (3 members)
- Erigeron clokeyi (2 members)
- Erigeron concinnus (3 members)
- Erigeron eatonii (6 members)
- Erigeron foliosus (5 members)
- Erigeron formosissimus (2 members)
- Erigeron glabellus (2 members)
- Erigeron glacialis (2 members)
- Erigeron inornatus (3 members)
- Erigeron lassenianus (2 members)
- Erigeron peregrinus (2 members)
- Erigeron petrophilus (3 members)
- Erigeron philadelphicus (3 members)
- Erigeron poliospermus (3 members)
- Erigeron pulchellus (3 members)
- Erigeron pumilus (2 members)
- Erigeron reductus (2 members)
- Erigeron sionis (2 members)
- Erigeron strigosus (4 members)
- Erigeron uncialis (2 members)
- Erigeron uniflorus (1 member)
- Eriobotrya (1 member)
- Eriocaulaceae (6 members)
- Eriocaulon (11 members)
- Eriochloa (13 members)
- Eriochloa acuminata (2 members)
- Eriochloa michauxii (2 members)
- Eriogonum (18 members)
- Eriogonum alatum (2 members)
- Eriogonum apricum (2 members)
- Eriogonum arcuatum (3 members)
- Eriogonum atrorubens (1 member)
- Eriogonum baileyi (2 members)
- Eriogonum breedlovei (2 members)
- Eriogonum brevicaule (8 members)
- Eriogonum cithariforme (2 members)
- Eriogonum compositum (3 members)
- Eriogonum corymbosum (8 members)
- Eriogonum deflexum (3 members)
- Eriogonum douglasii (3 members)
- Eriogonum elatum (2 members)
- Eriogonum elongatum (1 member)
- Eriogonum esmeraldense (2 members)
- Eriogonum fasciculatum (4 members)
- Eriogonum flavum (3 members)
- Eriogonum giganteum (3 members)
- Eriogonum gracile (2 members)
- Eriogonum grande (3 members)
- Eriogonum heermannii (8 members)
- Eriogonum hemipterum (1 member)
- Eriogonum heracleoides (2 members)
- Eriogonum hoffmannii (2 members)
- Eriogonum inerme (2 members)
- Eriogonum jamesii (3 members)
- Eriogonum kennedyi (5 members)
- Eriogonum lachnogynum (3 members)
- Eriogonum leptocladon (3 members)
- Eriogonum longifolium (3 members)
- Eriogonum luteolum (4 members)
- Eriogonum marifolium (2 members)
- Eriogonum microtheca (13 members)
- Eriogonum microthecum (0 members)
- Eriogonum multiflorum (2 members)
- Eriogonum nudum (13 members)
- Eriogonum nutans (2 members)
- Eriogonum ochrocephalum (2 members)
- Eriogonum ovalifolium (11 members)
- Eriogonum panguicense (2 members)
- Eriogonum pharnaceoides (2 members)
- Eriogonum prattenianum (2 members)
- Eriogonum prociduum (2 members)
- Eriogonum pyrolifolium (2 members)
- Eriogonum rosense (2 members)
- Eriogonum spergulinum (3 members)
- Eriogonum sphaerocephalum (4 members)
- Eriogonum strictum (4 members)
- Eriogonum subg. Clastomyelon (1 member)
- Eriogonum subg. Eriogonum (3 members)
- Eriogonum subg. Eucycla (125 members)
- Eriogonum subg. Ganysma (60 members)
- Eriogonum subg. Micrantha (3 members)
- Eriogonum subg. Oligogonum (44 members)
- Eriogonum subg. Oregonium (30 members)
- Eriogonum subg. Pterogonum (9 members)
- Eriogonum tenellum (3 members)
- Eriogonum thompsoniae (3 members)
- Eriogonum umbellatum (41 members)
- Eriogonum ursinum (2 members)
- Eriogonum wrightii (6 members)
- Eriogonum zionis (2 members)
- Erioneuron (3 members)
- Eriophorum (12 members)
- Eriophorum angustifolium (2 members)
- Eriophyllum (16 members)
- Eriophyllum ambiguum (2 members)
- Eriophyllum confertiflorum (2 members)
- Eriophyllum lanatum (10 members)
- Erpodiaceae (6 members)
- Erpodium (2 members)
- Eruca (2 members)
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- Erucastrum (1 member)
- Erysimum (20 members)
- Erysimum capitatum (2 members)
- Erythranthe (86 members)
- Erythronium (26 members)
- Erythronium americanum (2 members)
- Erythronium grandiflorum (2 members)
- Erythronium umbilicatum (2 members)
- Eschscholzia (12 members)
- Eschscholzia californica (2 members)
- Eschscholzia lemmonii (2 members)
- Eubotrys (2 members)
- Eucalyptus (15 members)
- Eucephalus (11 members)
- Eucephalus ledophyllus (2 members)
- Euchiton (3 members)
- Eucladium (1 member)
- Euclidium (1 member)
- Eucnide (5 members)
- Eucnide bartonioides (2 members)
- Eucommia (1 member)
- Eucommiaceae (2 members)
- Eugenia (5 members)
- Eulobus (1 member)
- Eulophia (1 member)
- Euonymus (8 members)
- Euonymus occidentalis (2 members)
- Eupatorium (28 members)
- Eupatorium album (3 members)
- Eupatorium hyssopifolium (2 members)
- Eupatorium leucolepis (2 members)
- Eupatorium rotundifolium (3 members)
- Euphorbia (12 members)
- Euphorbia austrotexana (2 members)
- Euphorbia chaetocalyx (2 members)
- Euphorbia deltoidea (4 members)
- Euphorbia geyeri (2 members)
- Euphorbia inundata (2 members)
- Euphorbia ocellata (2 members)
- Euphorbia pediculifera (1 member)
- Euphorbia polycarpa (1 member)
- Euphorbia sect. Alectoroctonum (21 members)
- Euphorbia sect. Anisophyllum (77 members)
- Euphorbia sect. Crepidaria (2 members)
- Euphorbia sect. Nummulariopsis (5 members)
- Euphorbia sect. Poinsettia (10 members)
- Euphorbia serpillifolia (2 members)
- Euphorbia subg. Esula (35 members)
- Euphorbia theriaca (2 members)
- Euphorbia tithymaloides (1 member)
- Euphorbiaceae (48 members)
- Euphrasia (22 members)
- Euphrasia arctica (2 members)
- Euphrasia oakesii (2 members)
- Euphrasia salisburgensis (1 member)
- Euphrasia stricta (2 members)
- Eurhynchiastrum (2 members)
- Eurhynchiastrum pulchellum (2 members)
- Eurybia (23 members)
- Eustachys (7 members)
- Eustoma (2 members)
- Eustoma exaltatum (2 members)
- Euthamia (5 members)
- Eutrema (2 members)
- Eutrochium (7 members)
- Eutrochium maculatum (3 members)
- Eutrochium purpureum (2 members)
- Evolvulus (7 members)
- Exochorda (1 member)
- Exudation (22 members)
- Fabronia (2 members)
- Fabroniaceae (2 members)
- Facelis (1 member)
- Fagaceae (10 members)
- Fagonia (3 members)
- Fagopyrum (2 members)
- Fagus (1 member)
- Fallopia (9 members)
- Fallopia japonica (1 member)
- Fallugia (1 member)
- Fatoua (1 member)
- Fendlera (2 members)
- Fendlerella (1 member)
- Ferocactus (7 members)
- Ferocactus hamatacanthus (2 members)
- Ferocactus viridescens (1 member)
- Festuca (9 members)
- Festuca brachyphylla (3 members)
- Festuca californica (3 members)
- Festuca rubra (10 members)
- Festuca saximontana (3 members)
- Festuca sect. Breviaristatae (7 members)
- Festuca sect. Elmera (1 member)
- Festuca sect. Festuca (35 members)
- Festuca sect. Subulatae (2 members)
- Festuca sect. Subuliflorae (1 member)
- Festuca sect. Texanae (1 member)
- Festuca subg. Festuca (4 members)
- Festuca subg. Montanae (2 members)
- Festuca subg. Obtusae (1 member)
- Festuca subg. Subulatae (6 members)
- Festuca viviparoidea (2 members)
- Ficus (10 members)
- Filago (3 members)
- Filago pyramidata (1 member)
- Filipendula (4 members)
- Fimbristylis (17 members)
- Fimbristylis puberula (2 members)
- Fingerhuthia (1 member)
- Firmiana (1 member)
- Fissidens (40 members)
- Fissidens closteri (1 member)
- Fissidens pellucidus (1 member)
- Fissidens serratus (1 member)
- Fissidentaceae (2 members)
- Flacourtia (1 member)
- Flaveria (8 members)
- Fleischmannia (2 members)
- Floerkea (1 member)
- Florestina (1 member)
- Flourensia (2 members)
- Flueggea (2 members)
- Flueggea virosa (1 member)
- Flyriella (1 member)
- Fontinalaceae (6 members)
- Fontinalis (10 members)
- Forsstroemia (2 members)
- Fothergilla (2 members)
- Fragaria (6 members)
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- Fragaria vesca (4 members)
- Fragaria virginiana (4 members)
- Frangula (10 members)
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- Frangula purshiana (3 members)
- Frangula rubra (5 members)
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- Frankeniaceae (2 members)
- Franklinia (1 member)
- Frasera (17 members)
- Frasera albicaulis (5 members)
- Frasera albomarginata (2 members)
- Freesia (2 members)
- Fremontodendron (3 members)
- Fritillaria (21 members)
- Fritillaria biflora (2 members)
- Froelichia (5 members)
- Fryxellia (1 member)
- Fuchsia (1 member)
- Fuirena (8 members)
- Fuirena simplex (2 members)
- Fumaria (3 members)
- Fumariaceae (8 members)
- Funaria (10 members)
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- Funariaceae (12 members)
- Funastrum (7 members)
- Furcraea (2 members)
- Gaillardia (11 members)
- Galanthus (2 members)
- Galax (1 member)
- Galeandra (1 member)
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- Galinsoga (3 members)
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- Galphimia (1 member)
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- Gamochaeta (12 members)
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- Gastridium (1 member)
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- Gaultheria (6 members)
- Gaylussacia (10 members)
- Gayophytum (9 members)
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- Gazania (1 member)
- Gelsemiaceae (2 members)
- Gelsemium (2 members)
- Gemmabryum (6 members)
- Gemmabryum sect. Caespitibryum (3 members)
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- Gemmabryum sect. Tuberibryum (9 members)
- Gentiana (32 members)
- Gentiana affinis (2 members)
- Gentiana andrewsii (2 members)
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- Gentiana prostrata (1 member)
- Gentianaceae (36 members)
- Gentianella (14 members)
- Gentianella amarella (1 member)
- Gentianella heterosepala (1 member)
- Gentianella propinqua (2 members)
- Gentianella quinquefolia (2 members)
- Gentianopsis (10 members)
- Gentianopsis detonsa (4 members)
- Gentianopsis virgata (3 members)
- Geocarpon (1 member)
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- Geraea (2 members)
- Geum (18 members)
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- Gigaspermaceae (2 members)
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- Ginkgophyta (1 member)
- Gisekia (1 member)
- Gladiolus (5 members)
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- Glandulicactus (2 members)
- Glandulicactus uncinatus (1 member)
- Glaucium (2 members)
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- Gleicheniaceae (2 members)
- Glinus (2 members)
- Globulinella (1 member)
- Glochidion (1 member)
- Glossopetalon (5 members)
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- Glossostigma (1 member)
- Glyceria (6 members)
- Glyceria canadensis (2 members)
- Glyceria grandis (2 members)
- Glyceria sect. Glyceria (9 members)
- Glyceria sect. Hydropoa (4 members)
- Glyceria sect. Striatae (8 members)
- Glyceria septentrionalis (2 members)
- Glyptopleura (2 members)
- Gnaphalium (3 members)
- Gnetophyta (1 member)
- Gochnatia (1 member)
- Gollania (1 member)
- Gomphrena (9 members)
- Gonolobus (4 members)
- Gonolobus suberosus (2 members)
- Goodmania (1 member)
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- Gossypianthus lanuginosus (2 members)
- Gossypium (3 members)
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- Gratiola (13 members)
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- Grimmia subg. Grimmia (4 members)
- Grimmia subg. Guembelia (13 members)
- Grimmia subg. Litoneuron (7 members)
- Grimmia subg. Rhabdogrimmia (17 members)
- Grimmia subg. Undetermined (2 members)
- Grimmiaceae (5 members)
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- Grimmiaceae subfam. Racomitrioideae (7 members)
- Grindelia (18 members)
- Grossulariaceae (2 members)
- Groutiella (2 members)
- Growth form (351 members)
- Grusonia (8 members)
- Guaiacum (2 members)
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- Gutierrezia (11 members)
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- Guzmania (2 members)
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- Gyminda (1 member)
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- Harmonia (5 members)
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- Helianthus (59 members)
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- Helianthus niveus (1 member)
- Helianthus nuttallii (3 members)
- Helianthus occidentalis (2 members)
- Helianthus pauciflorus (2 members)
- Helianthus petiolaris (2 members)
- Helianthus praecox (3 members)
- Helichrysum (1 member)
- Heliconia (1 member)
- Heliconiaceae (2 members)
- Helictotrichon (2 members)
- Heliomeris (6 members)
- Heliomeris longifolia (2 members)
- Heliomeris multiflora (3 members)
- Heliopsis (4 members)
- Heliopsis helianthoides (2 members)
- Helleborus (1 member)
- Helminthotheca (1 member)
- Helodiaceae (4 members)
- Helonias (1 member)
- Hemarthria (1 member)
- Hemerocallis (2 members)
- Hemiscola (3 members)
- Hemiscola aculeata (1 member)
- Hemitomes (1 member)
- Hemizonella (1 member)
- Hemizonia (2 members)
- Hemizonia congesta (6 members)
- Henicodium (1 member)
- Hennediella (3 members)
- Hennediella heimii (2 members)
- Herbertia (1 member)
- Herissantia (1 member)
- Hermannia (2 members)
- Hermbstaedtia (1 member)
- Herniaria (3 members)
- Herniaria hirsuta (2 members)
- Herpetineuron (1 member)
- Herrickia (6 members)
- Herrickia glauca (2 members)
- Herrickia kingii (2 members)
- Herzogiella (4 members)
- Hesperaloe (2 members)
- Hesperevax (5 members)
- Hesperevax acaulis (3 members)
- Hesperevax sparsiflora (2 members)
- Hesperidanthus (5 members)
- Hesperis (1 member)
- Hesperocallis (1 member)
- Hesperocnide (1 member)
- Hesperolinon (13 members)
- Hesperomecon (1 member)
- Hesperostipa (5 members)
- Hesperostipa comata (2 members)
- Hesperoyucca (2 members)
- Heteranthemis (1 member)
- Heteranthera (6 members)
- Heterocladium (3 members)
- Heteromeles (1 member)
- Heterophyllium (1 member)
- Heteropogon (2 members)
- Heteropterys (1 member)
- Heterosavia (1 member)
- Heterosperma (1 member)
- Heterotheca (24 members)
- Heterotheca camporum (2 members)
- Heterotheca fulcrata (4 members)
- Heterotheca oregona (4 members)
- Heterotheca sessiliflora (4 members)
- Heterotheca stenophylla (2 members)
- Heterotheca subaxillaris (2 members)
- Heterotheca villosa (9 members)
- Heuchera (36 members)
- Heuchera americana (3 members)
- Heuchera micrantha (5 members)
- Heuchera parviflora (2 members)
- Heuchera villosa (2 members)
- Hexalectris (6 members)
- Hexalectris spicata (2 members)
- Hexastylis (11 members)
- Hexastylis arifolia (3 members)
- Hexastylis shuttleworthii (2 members)
- Hibiscus (24 members)
- Hibiscus clypeatus (1 member)
- Hibiscus moscheutos (2 members)
- Hibiscus striatus (1 member)
- Hidden categories (1 member)
- Hieracium (36 members)
- Hilaria (6 members)
- Hilaria belangeri (2 members)
- Hilpertia (1 member)
- Hippeastrum (1 member)
- Hippocratea (1 member)
- Hippomane (1 member)
- Hippophaë (1 member)
- Hippuris (4 members)
- Hiptage (1 member)
- Hirschfeldia (1 member)
- Holcus (2 members)
- Hollisteria (1 member)
- Holmgrenanthe (1 member)
- Holocarpha (5 members)
- Holocarpha virgata (2 members)
- Holodiscus (4 members)
- Holodiscus discolor (2 members)
- Holodiscus microphyllus (3 members)
- Holosteum (2 members)
- Holosteum umbellatum (1 member)
- Holozonia (1 member)
- Homalia (2 members)
- Homalia trichomanoides (1 member)
- Homaliadelphus (1 member)
- Homalotheciella (1 member)
- Homalothecium (9 members)
- Homomallium (4 members)
- Homomallium mexicanum (2 members)
- Honckenya (2 members)
- Honckenya peploides (3 members)
- Hookeria (2 members)
- Hookeriaceae (2 members)
- Hordeum (15 members)
- Hordeum brachyantherum (2 members)
- Hordeum jubatum (2 members)
- Hordeum marinum (2 members)
- Hordeum murinum (3 members)
- Horkelia (10 members)
- Horkelia californica (3 members)
- Horkelia clevelandii (1 member)
- Horkelia congesta (2 members)
- Horkelia cuneata (3 members)
- Horkelia daucifolia (3 members)
- Horkelia fusca (7 members)
- Horkelia sect. Capitatae (2 members)
- Horkelia sect. Hispidulae (3 members)
- Horkelia sect. Horkelia (12 members)
- Horkelia sect. Parryae (2 members)
- Horkelia sect. Tridentatae (8 members)
- Horkelia tridentata (2 members)
- Horkeliella (2 members)
- Hornungia (1 member)
- Horsfordia (2 members)
- Hosta (3 members)
- Hottonia (1 member)
- Hovenia (1 member)
- Howelliella (1 member)
- Hudsonia (3 members)
- Hulsea (8 members)
- Hulsea vestita (6 members)
- Hulteniella (1 member)
- Humulus (3 members)
- Humulus lupulus (4 members)
- Hunzikeria (1 member)
- Huperzia (7 members)
- Hura (1 member)
- Hyacinthoides (2 members)
- Hybanthus (5 members)
- Hydrangea (5 members)
- Hydrangeaceae (18 members)
- Hydrastis (1 member)
- Hydrilla (1 member)
- Hydrocharis (1 member)
- Hydrocharitaceae (20 members)
- Hydrocleys (1 member)
- Hydrolea (6 members)
- Hydrolea spinosa (1 member)
- Hydroleaceae (2 members)
- Hygroamblystegium (2 members)
- Hygroamblystegium varium (4 members)
- Hygrohypnum (16 members)
- Hygroryza (1 member)
- Hylocereus (1 member)
- Hylocomiaceae (14 members)
- Hylocomiastrum (2 members)
- Hylocomium (1 member)
- Hylotelephium (3 members)
- Hymenachne (1 member)
- Hymenocallis (17 members)
- Hymenocallis henryae (2 members)
- Hymenocallis occidentalis (2 members)
- Hymenopappus (14 members)
- Hymenopappus artemisiifolius (2 members)
- Hymenopappus filifolius (13 members)
- Hymenopappus flavescens (2 members)
- Hymenopappus scabiosaeus (2 members)
- Hymenophyllaceae (4 members)
- Hymenophyllum (3 members)
- Hymenostylium (2 members)
- Hymenostylium recurvirostrum (2 members)
- Hymenothrix (3 members)
- Hymenoxys (19 members)
- Hymenoxys ambigens (3 members)
- Hymenoxys richardsonii (2 members)
- Hyophila (1 member)
- Hyophiladelphus (1 member)
- Hyoscyamus (2 members)
- Hyparrhenia (2 members)
- Hypericaceae (4 members)
- Hypericum (11 members)
- Hypericum ascyron (1 member)
- Hypericum hypericoides (2 members)
- Hypericum maculatum (1 member)
- Hypericum mutilum (2 members)
- Hypericum nitidum (2 members)
- Hypericum perforatum (1 member)
- Hypericum sect. Brathys (17 members)
- Hypericum sect. Hypericum (10 members)
- Hypericum sect. Myriandra (29 members)
- Hypericum sect. Roscyna (2 members)
- Hypericum sect. Webbia (1 member)
- Hypnaceae (38 members)
- Hypnum (24 members)
- Hypnum cupressiforme (4 members)
- Hypnum revolutum (2 members)
- Hypochaeris (5 members)
- Hypochaeris microcephala (1 member)
- Hypolepis (1 member)
- Hypopterygiaceae (2 members)
- Hypopterygium (2 members)
- Hypoxis (7 members)
- Iberis (3 members)
- Ibervillea (2 members)
- Idahoa (1 member)
- Iliamna (8 members)
- Illiciaceae (2 members)
- Illicium (2 members)
- Imbribryum (6 members)
- Imperata (3 members)
- Imported vocabulary (7 members)
- Indusiella (1 member)
- Inula (3 members)
- Iodanthus (1 member)
- Ionactis (5 members)
- Ionopsis (1 member)
- Ipomoea (53 members)
- Ipomoea carnea (1 member)
- Ipomoea cordatotriloba (2 members)
- Ipomoea pes-caprae (1 member)
- Ipomoea plummerae (2 members)
- Ipomoea tenuiloba (2 members)
- Ipomoea ternifolia (1 member)
- Iresine (5 members)
- Iridaceae (32 members)
- Iris (4 members)
- Iris (sect. Limniris) ser. Californicae (11 members)
- Iris (sect. Limniris) ser. Hexagonae (5 members)
- Iris (sect. Limniris) ser. Laevigatae (3 members)
- Iris (sect. Limniris) ser. Longipetalae (2 members)
- Iris (sect. Limniris) ser. Prisimaticae (1 member)
- Iris (sect. Limniris) ser. Sibirica (1 member)
- Iris (sect. Limniris) ser. Spuriae (1 member)
- Iris (sect. Limniris) ser. Tripetalae (3 members)
- Iris (sect. Limniris) ser. Vernae (2 members)
- Iris sect. Limniris (18 members)
- Iris sect. Lophiris (3 members)
- Iris subg. Iris (3 members)
- Iris subg. Limniris (4 members)
- Iris verna (2 members)
- Isatis (1 member)
- Ischaemum (2 members)
- Ismelia (1 member)
- Isocarpha (2 members)
- Isocarpha oppositifolia (1 member)
- Isocoma (12 members)
- Isocoma acradenia (3 members)
- Isocoma menziesii (5 members)
- Isolepis (4 members)
- Isopterygiopsis (3 members)
- Isopterygium (2 members)
- Isothecium (5 members)
- Isotria (2 members)
- Isoëtaceae (2 members)
- Isoëtes (24 members)
- Itea (1 member)
- Iteaceae (2 members)
- Iva (7 members)
- Ivesia (10 members)
- Ivesia aperta (2 members)
- Ivesia argyrocoma (1 member)
- Ivesia arizonica (2 members)
- Ivesia baileyi (2 members)
- Ivesia gordonii (4 members)
- Ivesia kingii (2 members)
- Ivesia lycopodioides (3 members)
- Ivesia rhypara (2 members)
- Ivesia sect. Comarella (2 members)
- Ivesia sect. Ivesia (10 members)
- Ivesia sect. Setosae (15 members)
- Ivesia sect. Stellariopsis (1 member)
- Ivesia sect. Unguiculatae (11 members)
- Ivesia shockleyi (2 members)
- Iwatsukiella (1 member)
- Ixeris (1 member)
- Ixophorus (1 member)
- Jaborosa (1 member)
- Jacquemontia (7 members)
- Jacquinia (2 members)
- Jaegerina (1 member)
- Jaffueliobryum (2 members)
- Jaltomata (1 member)
- Jamesia (3 members)
- Jamesia americana (4 members)
- Jamesianthus (1 member)
- Jarava (3 members)
- Jatropha (11 members)
- Jatropha dioica (2 members)
- Jaumea (1 member)
- Jefea (1 member)
- Jeffersonia (1 member)
- Jensia (2 members)
- Jepsonia (3 members)
- Johanneshowellia (2 members)
- Jovibarba (1 member)
- Juglandaceae (4 members)
- Juglans (7 members)
- Juglans major (1 member)
- Juncaceae (4 members)
- Juncaginaceae (4 members)
- Juncus (14 members)
- Juncus acutus (1 member)
- Juncus arcticus (3 members)
- Juncus covillei (2 members)
- Juncus ensifolius (2 members)
- Juncus falcatus (2 members)
- Juncus hemiendytus (2 members)
- Juncus stygius (1 member)
- Juncus subg. Alpini (6 members)
- Juncus subg. Ensifolii (7 members)
- Juncus subg. Genuini (12 members)
- Juncus subg. Graminifolii (23 members)
- Juncus subg. Juncus (5 members)
- Juncus subg. Poiophylli (18 members)
- Juncus subg. Septati (33 members)
- Juncus triglumis (2 members)
- Juncus validus (2 members)
- Juniperus (4 members)
- Juniperus communis (3 members)
- Juniperus deppeana (1 member)
- Juniperus flaccida (1 member)
- Juniperus occidentalis (2 members)
- Juniperus sect. Juniperus (2 members)
- Juniperus sect. Sabina (16 members)
- Juniperus virginiana (2 members)
- Kalanchoë (3 members)
- Kallstroemia (6 members)
- Kalmia (10 members)
- Kalmia angustifolia (2 members)
- Kalmia microphylla (2 members)
- Kalmiopsis (2 members)
- Karroochloa (1 member)
- Karwinskia (1 member)
- Keckiella (11 members)
- Keckiella antirrhinoides (2 members)
- Keckiella breviflora (2 members)
- Keckiella rothrockii (2 members)
- Keckiella ternata (2 members)
- Kelseya (1 member)
- Kerria (1 member)
- Kiaeria (4 members)
- Kickxia (2 members)
- Kindbergia (2 members)
- Koanophyllon (3 members)
- Kobresia (3 members)
- Kochia (4 members)
- Kochia scoparia (1 member)
- Kochia sect. Neokochia (2 members)
- Kochia sect. Semibassia (2 members)
- Koeberlinia (2 members)
- Koeberlinia spinosa (3 members)
- Koeberliniaceae (2 members)
- Koeleria (3 members)
- Koenigia (1 member)
- Kopsiopsis (2 members)
- Kosteletzkya (2 members)
- Krameria (4 members)
- Krameriaceae (2 members)
- Krapovickasia (1 member)
- Krascheninnikovia (1 member)
- Krigia (8 members)
- Krigia cespitosa (2 members)
- Krugiodendron (1 member)
- Kyhosia (1 member)
- Kyllinga (5 members)
- L w ratio (16 members)
- Lachnagrostis (1 member)
- Lachnanthes (1 member)
- Lachnocaulon (5 members)
- Lactuca (10 members)
- Lagascea (2 members)
- Lagascea decipiens (1 member)
- Lagenaria (2 members)
- Lagenaria siceraria (1 member)
- Lagerstroemia (1 member)
- Lagophylla (4 members)
- Lagotis (2 members)
- Lagotis glauca (2 members)
- Lagunaria (1 member)
- Laguncularia (1 member)
- Lagurus (1 member)
- Lamarckia (1 member)
- Laportea (2 members)
- Lapsana (1 member)
- Lapsanastrum (1 member)
- Lardizabalaceae (2 members)
- Larix (3 members)
- Larrea (1 member)
- Lasiacis (2 members)
- Lasianthaea (1 member)
- Lastarriaea (1 member)
- Lasthenia (14 members)
- Lasthenia californica (3 members)
- Lasthenia glabrata (2 members)
- Lasthenia sect. Amphiachaenia (5 members)
- Lasthenia sect. Burrielia (2 members)
- Lasthenia sect. Hologymne (4 members)
- Lasthenia sect. Lasthenia (1 member)
- Lasthenia sect. Ornduffia (3 members)
- Lasthenia sect. Platycarpha (1 member)
- Lasthenia sect. Ptilomeris (3 members)
- Launaea (1 member)
- Lauraceae (18 members)
- Lavatera (3 members)
- Layia (15 members)
- Layia pentachaeta (2 members)
- Laënnecia (6 members)
- Leavenworthia (8 members)
- Lechea (20 members)
- Lechea intermedia (4 members)
- Lechea maritima (3 members)
- Lechea pulchella (3 members)
- Lechea torreyi (2 members)
- Leersia (5 members)
- Leibnitzia (1 member)
- Leitneria (1 member)
- Leitneriaceae (2 members)
- Lembophyllaceae (6 members)
- Lemna (9 members)
- Lemnaceae (8 members)
- Length (102 members)
- Lenophyllum (1 member)
- Leontodon (4 members)
- Leontodon saxatilis (2 members)
- Lepanthopsis (1 member)