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)- Helianthus debilis (5 members)
- 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)
- Lepidium (44 members)
- Lepidium lasiocarpum (2 members)
- Lepidium virginicum (2 members)
- Lepidospartum (3 members)
- Leptarrhena (1 member)
- Leptobryum (1 member)
- Leptochloa (12 members)
- Leptochloa fusca (3 members)
- Leptochloa panicea (2 members)
- Leptodictyum (2 members)
- Leptodon (1 member)
- Leptodontaceae (6 members)
- Leptodontium (3 members)
- Leptodontium viticulosoides (1 member)
- Leptohymenium (1 member)
- Leptopterigynandrum (1 member)
- Leptospermum (1 member)
- Leptostomopsis (2 members)
- Lepuropetalon (1 member)
- Lepyrodiclis (1 member)
- Lescuraea (1 member)
- Leskea (4 members)
- Leskeaceae (18 members)
- Leskeella (1 member)
- Lessingia (15 members)
- Lessingia glandulifera (3 members)
- Lessingia micradenia (2 members)
- Lessingia pectinata (2 members)
- Leucanthemella (1 member)
- Leucanthemum (3 members)
- Leuciva (1 member)
- Leucobryaceae (2 members)
- Leucobryum (2 members)
- Leucocrinum (1 member)
- Leucodon (3 members)
- Leucodontaceae (6 members)
- Leucojum (1 member)
- Leucolepis (1 member)
- Leucophanaceae (2 members)
- Leucophyllum (3 members)
- Leucophysalis (2 members)
- Leucopoa (1 member)
- Leucospora (1 member)
- Leucothoë (3 members)
- Lewisia (19 members)
- Lewisia columbiana (3 members)
- Lewisia cotyledon (3 members)
- Lewisia rediviva (2 members)
- Leymus (21 members)
- Leymus innovatus (2 members)
- Leymus mollis (2 members)
- Leymus salina (3 members)
- Leymus simplex (2 members)
- Liatris (44 members)
- Liatris elegans (4 members)
- Liatris pauciflora (2 members)
- Liatris punctata (3 members)
- Liatris pycnostachya (2 members)
- Liatris scariosa (3 members)
- Liatris spicata (2 members)
- Liatris squarrosa (2 members)
- Libertia (1 member)
- Licania (1 member)
- Licaria (1 member)
- Life cycle (137 members)
- Ligularia (1 member)
- Lilaea (1 member)
- Liliaceae (140 members)
- Lilium (25 members)
- Lilium humboldtii (2 members)
- Lilium pardalinum (5 members)
- Lilium washingtonianum (2 members)
- Limbella (1 member)
- Limnanthaceae (4 members)
- Limnanthes (4 members)
- Limnanthes alba (4 members)
- Limnanthes douglasii (5 members)
- Limnanthes floccosa (5 members)
- Limnanthes sect. Inflexae (5 members)
- Limnanthes sect. Limnanthes (5 members)
- Limnobium (1 member)
- Limnocharitaceae (2 members)
- Limnodea (1 member)
- Limnophila (2 members)
- Limonium (8 members)
- Limosella (2 members)
- Linaceae (8 members)
- Linaria (12 members)
- Linaria dalmatica (2 members)
- Linaria genistifolia (1 member)
- Lindbergia (2 members)
- Lindera (3 members)
- Lindernia (6 members)
- Linderniaceae (6 members)
- Lindheimera (1 member)
- Linum (6 members)
- Linum australe (2 members)
- Linum berlandieri (2 members)
- Linum carteri (2 members)
- Linum floridanum (2 members)
- Linum lewisii (3 members)
- Linum medium (2 members)
- Linum rigidum (2 members)
- Linum sect. Cathartolinum (1 member)
- Linum sect. Linopsis (36 members)
- Linum sect. Linum (7 members)
- Liparis (3 members)
- Lipocarpha (6 members)
- Liquidambar (1 member)
- Liriodendron (1 member)
- Listera (9 members)
- Listera cordata (2 members)
- Lithachne (1 member)
- Lithocarpus (2 members)
- Lithocarpus densiflorus (2 members)
- Lithophragma (10 members)
- Litsea (1 member)
- Littorella (1 member)
- Livistona (2 members)
- Lloydia (2 members)
- Lloydia serotina (2 members)
- Loasaceae (8 members)
- Lobularia (1 member)
- Loeflingia (1 member)
- Loeskeobryum (1 member)
- Loeskypnum (2 members)
- Loganiaceae (6 members)
- Logfia (6 members)
- Lolium (6 members)
- Lolium temulentum (2 members)
- Lomariopsis (1 member)
- Lomatogonium (2 members)
- Lomatogonium rotatum (2 members)
- Lophiola (1 member)
- Lophophora (1 member)
- Lorandersonia (7 members)
- Lorentziella (1 member)
- Ludwigia (14 members)
- Ludwigia glandulosa (2 members)
- Ludwigia peploides (3 members)
- Ludwigia sect. Isnardia (19 members)
- Ludwigia sect. Jussiaea (4 members)
- Ludwigia sect. Ludwigia (4 members)
- Ludwigia sect. Macrocarpon (2 members)
- Ludwigia sect. Myrtocarpus (1 member)
- Ludwigia sect. Pterocaulon (2 members)
- Ludwigia sect. Seminudae (1 member)
- Luetkea (1 member)
- Luffa (3 members)
- Luffa acutangula (1 member)
- Luina (2 members)
- Luisierella (1 member)
- Luma (1 member)
- Lumnitzera (1 member)
- Lunaria (1 member)
- Luziola (3 members)
- Luzula (6 members)
- Luzula acuminata (2 members)
- Luzula arcuata (1 member)
- Luzula luzuloides (1 member)
- Luzula multiflora (3 members)
- Luzula subg. Anthelaea (7 members)
- Luzula subg. Luzula (17 members)
- Luzula subg. Pterodes (3 members)
- Lycianthes (2 members)
- Lycium (19 members)
- Lycium pallidum (2 members)
- Lycopodiaceae (14 members)
- Lycopodiella (6 members)
- Lycopodiophyta (3 members)
- Lycopodium (6 members)
- Lycurus (2 members)
- Lyellia (1 member)
- Lygodesmia (6 members)
- Lygodesmia grandiflora (5 members)
- Lygodiaceae (2 members)
- Lygodium (3 members)
- Lyonia (6 members)
- Lyonia ligustrina (2 members)
- Lyonothamnus (1 member)
- Lyrocarpa (1 member)
- Lysichiton (1 member)
- Lysimachia (20 members)
- Lythraceae (20 members)
- Lythrum (13 members)
- Lythrum alatum (2 members)
- Mabrya (1 member)
- Machaeranthera (2 members)
- Macleaya (1 member)
- Maclura (1 member)
- Macradenia (1 member)
- Macranthera (1 member)
- Macrochloa (1 member)
- Macrocoma (2 members)
- Macrocoma tenuis (1 member)
- Macromitrium (1 member)
- Macrothelypteris (1 member)
- Madia (10 members)
- Magnolia (8 members)
- Magnoliaceae (4 members)
- Magnoliophyta (178 members)
- Maianthemum (6 members)
- Maianthemum racemosum (2 members)
- Malachra (2 members)
- Malacomeles (1 member)
- Malacothamnus (10 members)
- Malacothrix (20 members)
- Malacothrix foliosa (4 members)
- Malacothrix saxatilis (5 members)
- Malaxis (11 members)
- Malaxis monophyllos (2 members)
- Malephora (1 member)
- Malperia (1 member)
- Malpighia (1 member)
- Malpighiaceae (16 members)
- Malus (10 members)
- Malva (11 members)
- Malvaceae (12 members)
- Malvaceae subfam. Bombacoideae (2 members)
- Malvaceae subfam. Byttnerioideae (8 members)
- Malvaceae subfam. Grewioideae (4 members)
- Malvaceae subfam. Malvoideae (84 members)
- Malvaceae subfam. Sterculioideae (4 members)
- Malvaceae subfam. Tilioideae (2 members)
- Malvastrum (6 members)
- Malvaviscus (2 members)
- Malvaviscus arboreus (2 members)
- Malvella (3 members)
- Mammea (1 member)
- Mammillaria (17 members)
- Mammillaria heyderi (2 members)
- Mammillaria prolifera (1 member)
- Mammillaria wrightii (2 members)
- Mandevilla (5 members)
- Manfreda (5 members)
- Manihot (6 members)
- Manilkara (3 members)
- Manilkara jaimiqui (1 member)
- Mantisalca (1 member)
- Marah (7 members)
- Maranta (1 member)
- Marantaceae (4 members)
- Marshallia (7 members)
- Marsilea (6 members)
- Marsileaceae (4 members)
- Matelea (22 members)
- Matricaria (3 members)
- Matteuccia (2 members)
- Matteuccia struthiopteris (1 member)
- Matthiola (2 members)
- Maurandella (1 member)
- Mauranthemum (1 member)
- Maxillaria (2 members)
- Maxonia (2 members)
- Maxonia apiifolia (1 member)
- Mayaca (1 member)
- Mayacaceae (2 members)
- Maytenus (3 members)
- Maytenus phyllanthoides (2 members)
- Mazaceae (2 members)
- Mazus (2 members)
- Mecardonia (3 members)
- Mecardonia acuminata (3 members)
- Meconella (3 members)
- Medeola (1 member)
- Meesia (3 members)
- Meesiaceae (8 members)
- Megathyrsus (1 member)
- Meiotrichum (1 member)
- Melaleuca (4 members)
- Melampodium (7 members)
- Melampyrum (1 member)
- Melanthera (3 members)
- Melanthium (4 members)
- Melastoma (1 member)
- Melastomataceae (6 members)
- Melica (22 members)
- Melica geyeri (2 members)
- Melica porteri (2 members)
- Melica stricta (2 members)
- Melinis (3 members)
- Melochia (6 members)
- Melochia pyramidata (1 member)
- Melochia tomentosa (1 member)
- Melothria (1 member)
- Menispermaceae (8 members)
- Menispermum (1 member)
- Mentzelia (10 members)
- Mentzelia humilis (2 members)
- Mentzelia laevicaulis (2 members)
- Mentzelia longiloba (3 members)
- Mentzelia sect. Bartonia (54 members)
- Mentzelia sect. Bicuspidaria (5 members)
- Mentzelia sect. Mentzelia (7 members)
- Mentzelia sect. Micromentzelia (2 members)
- Mentzelia sect. Trachyphytum (21 members)
- Mentzelia torreyi (2 members)
- Menziesia (2 members)
- Mercurialis (1 member)
- Merremia (6 members)
- Mesadenus (1 member)
- Mesembryanthemum (2 members)
- Mespilus (1 member)
- Metastelma (7 members)
- Meteoriaceae (4 members)
- Meximalva (1 member)
- Mibora (1 member)
- Micranthemum (3 members)
- Micranthes (46 members)
- Micranthes nelsoniana (5 members)
- Microbryum (6 members)
- Microbryum davallianum (3 members)
- Microbryum starckeanum (3 members)
- Microchloa (1 member)
- Microgramma (1 member)
- Micromitrium (4 members)
- Micromonolepis (1 member)
- Micropsis (1 member)
- Micropus (3 members)
- Micropus californicus (2 members)
- Microseris (13 members)
- Microseris douglasii (3 members)
- Microseris laciniata (4 members)
- Microstachys (1 member)
- Microstegium (1 member)
- Microthlaspi (1 member)
- Mielichhoferia (3 members)
- Mielichhoferiaceae (6 members)
- Mikania (3 members)
- Milium (2 members)
- Milla (1 member)
- Mimetanthe (1 member)
- Mimulus (3 members)
- Mimulus ringens (2 members)
- Mimusops (1 member)
- Minuartia (34 members)
- Minuartia nuttallii (4 members)
- Mirabilis (10 members)
- Mirabilis jalapa (1 member)
- Mirabilis laevis (3 members)
- Mirabilis linearis (3 members)
- Mirabilis multiflora (3 members)
- Mirabilis sect. Mirabilis (3 members)
- Mirabilis sect. Mirabilopsis (1 member)
- Mirabilis sect. Oxybaphoides (4 members)
- Mirabilis sect. Oxybaphus (11 members)
- Mirabilis sect. Quamoclidion (6 members)
- Miscanthus (5 members)
- Misopates (2 members)
- Misopates orontium (1 member)
- Mitella (9 members)
- Mitreola (3 members)
- Mniaceae (16 members)
- Mnium (9 members)
- Modiola (1 member)
- Moehringia (3 members)
- Moenchia (2 members)
- Moenchia erecta (1 member)
- Mohavea (2 members)
- Molendoa (3 members)
- Molinia (1 member)
- Molluginaceae (4 members)
- Mollugo (2 members)
- Momordica (3 members)
- Momordica charantia (1 member)
- Monanthochloë (1 member)
- Moneses (1 member)
- Monnina (1 member)
- Monochoria (1 member)
- Monolepis (2 members)
- Monolopia (5 members)
- Monoptilon (2 members)
- Monotropa (2 members)
- Monotropsis (1 member)
- Montia (8 members)
- Moorochloa (1 member)
- Moraceae (14 members)
- Moringa (1 member)
- Moringaceae (2 members)
- Mortonia (4 members)
- Morus (3 members)
- Mosiera (1 member)
- Mucronea (2 members)
- Muehlenbeckia (3 members)
- Muehlenbeckia hastulata (1 member)
- Muhlenbergia (70 members)
- Muilla (3 members)
- Mulgedium (1 member)
- Munroa (1 member)
- Muntingia (1 member)
- Muntingiaceae (2 members)
- Munzothamnus (1 member)
- Murdannia (3 members)
- Musa (2 members)
- Musaceae (2 members)
- Muscari (3 members)
- Myagrum (1 member)
- Mycelis (1 member)
- Myoporum (3 members)
- Myosoton (1 member)
- Myosurus (6 members)
- Myosurus apetalus (2 members)
- Myrcianthes (1 member)
- Myrica (7 members)
- Myricaceae (4 members)
- Myrinia (1 member)
- Myriniaceae (4 members)
- Myriophyllum (14 members)
- Myrsinaceae (10 members)
- Myrsine (1 member)
- Myrtaceae (26 members)
- Myrtus (1 member)
- Myurella (3 members)
- Myuroclada (1 member)
- Najadaceae (2 members)
- Najas (9 members)
- Najas guadalupensis (4 members)
- Nandina (1 member)
- Napaea (1 member)
- Narcissus (5 members)
- Nardus (1 member)
- Narthecium (2 members)
- Nassella (10 members)
- Nasturtium (4 members)
- Neckera (5 members)
- Neckeraceae (16 members)
- Neckeropsis (2 members)
- Nectandra (1 member)
- Nectouxia (1 member)
- Neillia (1 member)
- Nekemias (1 member)
- Nelumbo (2 members)
- Nelumbonaceae (2 members)
- Nemacaulis (2 members)
- Nemacaulis denudata (2 members)
- Nemastylis (5 members)
- Nemastylis tenuis (1 member)
- Neogaerrhinum (2 members)
- Neoholmgrenia (2 members)
- Neolloydia (2 members)
- Neolloydia conoidea (1 member)
- Neomacounia (1 member)
- Neonesomia (1 member)
- Neostapfia (1 member)
- Nephrolepis (5 members)
- Nerisyrenia (2 members)
- Nerium (1 member)
- Neslia (1 member)
- Nestotus (2 members)
- Nestronia (1 member)
- Neurodium (1 member)
- Nevada (1 member)
- Neviusia (2 members)
- Neyraudia (1 member)
- Nicandra (1 member)
- Nicolletia (2 members)
- Nicotiana (12 members)
- Nigella (1 member)
- Niphotrichum (4 members)
- Niphotrichum canescens (2 members)
- Niphotrichum sect. Elongata (4 members)
- Niphotrichum sect. Niphotrichum (3 members)
- Nipponanthemum (1 member)
- Nitrophila (2 members)
- Noccaea (4 members)
- Noccaea fendleri (5 members)
- Nogopterium (1 member)
- Nolina (14 members)
- Nopalea (1 member)
- Nothocalaïs (4 members)
- Nothochelone (1 member)
- Notholaena (12 members)
- Notholaena californica (2 members)
- Notholaena grayi (2 members)
- Nothoscordum (2 members)
- Nuphar (8 members)
- Nuttallanthus (3 members)
- Nyctaginaceae (26 members)
- Nyctaginia (1 member)
- Nymphaea (10 members)
- Nymphaea odorata (2 members)
- Nymphaeaceae (4 members)
- Nyssa (5 members)
- Nyssaceae (2 members)
- Obolaria (1 member)
- Ochrosia (1 member)
- Oclemena (4 members)
- Octoblepharum (1 member)
- Odontites (1 member)
- Odontosoria (1 member)
- Odontostomum (1 member)
- Oeceoclades (1 member)
- Oedipodiaceae (2 members)
- Oedipodium (1 member)
- Oemleria (1 member)
- Oenothera (31 members)
- Oenothera (sect. Oenothera) ser. Allochroa (2 members)
- Oenothera avita (3 members)
- Oenothera californica (0 members)
- Oenothera capillifolia (2 members)
- Oenothera cespitosa (5 members)
- Oenothera cinerea (2 members)
- Oenothera deltoides (5 members)
- Oenothera drummondii (1 member)
- Oenothera elata (2 members)
- Oenothera fruticosa (2 members)
- Oenothera hartwegii (5 members)
- Oenothera heterophylla (2 members)
- Oenothera macrocarpa (4 members)
- Oenothera pallida (4 members)
- Oenothera sect. Anogra (10 members)
- Oenothera sect. Calylophus (4 members)
- Oenothera sect. Contortae (1 member)
- Oenothera sect. Eremia (1 member)
- Oenothera sect. Gaura (15 members)
- Oenothera sect. Gauropsis (1 member)
- Oenothera sect. Hartmannia (4 members)
- Oenothera sect. Kleinia (2 members)
- Oenothera sect. Kneiffia (7 members)
- Oenothera sect. Lavauxia (2 members)
- Oenothera sect. Leucocoryne (2 members)
- Oenothera sect. Megapterium (5 members)
- Oenothera sect. Oenothera (12 members)
- Oenothera sect. Pachylophus (5 members)
- Oenothera sect. Paradoxus (1 member)
- Oenothera sect. Peniophyllum (1 member)
- Oenothera stricta (1 member)
- Oenothera subsect. Calylophus (4 members)
- Oenothera subsect. Campogaura (2 members)
- Oenothera subsect. Candela (6 members)
- Oenothera subsect. Emersonia (1 member)
- Oenothera subsect. Gaura (12 members)
- Oenothera subsect. Lavauxia (3 members)
- Oenothera subsect. Munzia (2 members)
- Oenothera subsect. Nutantigemma (1 member)
- Oenothera subsect. Oenothera (14 members)
- Oenothera subsect. Raimannia (7 members)
- Oenothera subsect. Salpingia (6 members)
- Oenothera subsect. Schizocarya (1 member)
- Oenothera subsect. Stenosiphon (1 member)
- Oenothera subsect. Stipogaura (6 members)
- Oenothera subsect. Xenogaura (1 member)
- Oenothera subsect. Xerogaura (1 member)
- Oenothera tubicula (1 member)
- Oenothera villosa (2 members)
- Okenia (1 member)
- Oligomeris (1 member)
- Oligotrichum (4 members)
- Olsynium (2 members)
- Olsynium douglasii (2 members)
- Omalotheca (3 members)
- Onagraceae (4 members)
- Onagraceae subfam. Ludwigioideae (2 members)
- Onagraceae subfam. Onagroideae (6 members)
- Onagraceae tribe Circaeeae (4 members)
- Onagraceae tribe Epilobieae (4 members)
- Onagraceae tribe Onagreae (24 members)
- Oncidium (1 member)
- Oncophorus (3 members)
- Oncosiphon (1 member)
- Onoclea (1 member)
- Onopordum (4 members)
- Onopordum acanthium (1 member)
- Operculina (1 member)
- Ophioglossaceae (6 members)
- Ophioglossum (7 members)
- Opizia (1 member)
- Oplismenus (1 member)
- Opuntia (38 members)
- Opuntia basilaris (4 members)
- Opuntia engelmannii (5 members)
- Opuntia humifusa (2 members)
- Opuntia polyacantha (5 members)
- Orchidaceae (8 members)
- Orchidaceae (tribe Arethuseae) subtribe Arethusinae (2 members)
- Orchidaceae (tribe Arethuseae) subtribe Bletiinae (6 members)
- Orchidaceae (tribe Cranichideae) subtribe Cranichidinae (4 members)
- Orchidaceae (tribe Cranichideae) subtribe Goodyerinae (6 members)
- Orchidaceae (tribe Cranichideae) subtribe Prescottiinae (2 members)
- Orchidaceae (tribe Cranichideae) subtribe Spiranthinae (22 members)
- Orchidaceae (tribe Cymbidieae) subtribe Corallorhizinae (4 members)
- Orchidaceae (tribe Cymbidieae) subtribe Cyrtopodiinae (4 members)
- Orchidaceae (tribe Cymbidieae) subtribe Eulophiinae (6 members)
- Orchidaceae (tribe Cymbidieae) subtribe Goveniinae (2 members)
- Orchidaceae (tribe Epidendreae) subtribe Laeliinae (8 members)
- Orchidaceae (tribe Epidendreae) subtribe Pleurothallidinae (4 members)
- Orchidaceae (tribe Epidendreae) subtribe Polystachynae (2 members)
- Orchidaceae (tribe Maxillarieae) subtribe Maxillariinae (2 members)
- Orchidaceae (tribe Maxillarieae) subtribe Oncidiinae (12 members)
- Orchidaceae (tribe Neottieae) subtribe Limodorinae (6 members)
- Orchidaceae (tribe Orchideae) subtribe Habenariinae (2 members)
- Orchidaceae (tribe Orchideae) subtribe Orchidinae (14 members)
- Orchidaceae (tribe Vanilleae) subtribe Pogoniinae (6 members)
- Orchidaceae (tribe Vanilleae) subtribe Vanillinae (2 members)
- Orchidaceae subfam. Cypripedioideae (2 members)
- Orchidaceae subfam. Epidendroideae (22 members)
- Orchidaceae subfam. Orchidoideae (4 members)
- Orchidaceae subfam. Vanilloideae (2 members)
- Orchidaceae tribe Arethuseae (4 members)
- Orchidaceae tribe Calypsoeae (4 members)
- Orchidaceae tribe Cranichideae (8 members)
- Orchidaceae tribe Cymbidieae (8 members)
- Orchidaceae tribe Dendrobieae (2 members)
- Orchidaceae tribe Epidendreae (6 members)
- Orchidaceae tribe Malaxideae (4 members)
- Orchidaceae tribe Maxillarieae (4 members)
- Orchidaceae tribe Neottieae (2 members)
- Orchidaceae tribe Orchideae (4 members)
- Orchidaceae tribe Triphoreae (2 members)
- Orchidaceae tribe Tropidieae (2 members)
- Orchidaceae tribe Vandeae (6 members)
- Orchidaceae tribe Vanilleae (4 members)
- Orcuttia (5 members)
- Oreas (1 member)
- Oreochrysum (1 member)
- Oreostemma (4 members)
- Oreostemma alpigenum (3 members)
- Ornithogalum (2 members)
- Ornithostaphylos (1 member)
- Orobanchaceae (54 members)
- Orobanche (23 members)
- Orobanche californica (6 members)
- Orobanche cooperi (3 members)
- Orobanche corymbosa (2 members)
- Orobanche parishii (2 members)
- Orobanche uniflora (2 members)
- Orobanche valida (2 members)
- Orochaenactis (1 member)
- Orontium (1 member)
- Orthilia (1 member)
- Orthocarpus (11 members)
- Orthocarpus cuspidatus (3 members)
- Orthocarpus tolmiei (2 members)
- Orthodontiaceae (2 members)
- Orthodontium (2 members)
- Orthosia (1 member)
- Orthothecium (6 members)
- Orthothecium chryseum (2 members)
- Orthotrichaceae (18 members)
- Orthotrichum (48 members)
- Orthotrichum pallens (3 members)
- Orychophragmus (1 member)
- Oryctes (1 member)
- Oryza (4 members)
- Oryzopsis (1 member)
- Osmadenia (1 member)
- Osmunda (5 members)
- Osmunda regalis (1 member)
- Osmundaceae (2 members)
- Osteospermum (2 members)
- Ostrya (3 members)
- Ottelia (1 member)
- Oxalidaceae (2 members)
- Oxalis (38 members)
- Oxalis frutescens (1 member)
- Oxalis hirta (1 member)
- Oxycaryum (1 member)
- Oxydendrum (1 member)
- Oxyria (1 member)
- Oxyrrhynchium (1 member)
- Oxystylis (1 member)
- Oxytenia (1 member)
- Oxytheca (4 members)
- Oxytheca dendroidea (1 member)
- Oönopsis (5 members)
- Oönopsis foliosa (2 members)
- Pachycereus (1 member)
- Pachysandra (2 members)
- Packera (60 members)
- Packera bolanderi (2 members)
- Packera dimorphophylla (3 members)
- Packera eurycephala (2 members)
- Packera neomexicana (3 members)
- Packera pseudaurea (3 members)
- Packera subnuda (2 members)
- Paeonia (2 members)
- Paeoniaceae (2 members)
- Pages using duplicate arguments in template calls (9 members)
- Pages with broken file links (112 members)
- Palafoxia (10 members)
- Palamocladium (1 member)
- Palhinhaea (1 member)
- Paliurus (1 member)
- Paludella (1 member)
- Palustriella (1 member)
- Panicum (6 members)
- Panicum amarum (2 members)
- Panicum anceps (2 members)
- Panicum capillare (2 members)
- Panicum dichotomiflorum (3 members)
- Panicum hallii (2 members)
- Panicum hirticaule (3 members)
- Panicum miliaceum (2 members)
- Panicum philadelphicum (3 members)
- Panicum rigidulum (5 members)
- Panicum sect. Agrostoidea (4 members)
- Panicum sect. Antidotalia (1 member)
- Panicum sect. Bulbosa (2 members)
- Panicum sect. Dichotomiflora (4 members)
- Panicum sect. Hemitonia (1 member)
- Panicum sect. Monticola (2 members)
- Panicum sect. Obtusa (1 member)
- Panicum sect. Panicum (18 members)
- Panicum sect. Phanopyrum (1 member)
- Panicum sect. Repentia (5 members)
- Panicum sect. Tenera (1 member)
- Panicum sect. Urvilleana (1 member)
- Panicum sect. Verrucosa (2 members)
- Panicum subg. Agrostoidea (10 members)
- Panicum subg. Panicum (8 members)
- Panicum subg. Phanopyrum (8 members)
- Papaver (13 members)
- Papaver macounii (2 members)
- Papaver nudicaule (1 member)
- Papaver radicatum (4 members)
- Papaver sect. Argemonidium (1 member)
- Papaver sect. Californicum (1 member)
- Papaver sect. Macrantha (1 member)
- Papaver sect. Meconella (12 members)
- Papaver sect. Papaver (1 member)
- Papaver sect. Rhoeadium (2 members)
- Papaveraceae (34 members)
- Papillaria (1 member)
- Pappophorum (2 members)
- Paraleucobryum (2 members)
- Parapholis (2 members)
- Parasenecio (1 member)
- Parietaria (6 members)
- Parietaria hespera (2 members)
- Parkeriaceae (2 members)
- Parnassia (10 members)
- Parnassia cirrata (2 members)
- Paronychia (29 members)
- Paronychia chartacea (2 members)
- Paronychia echinulata (1 member)
- Paronychia fastigiata (3 members)
- Parrya (4 members)
- Parthenice (1 member)
- Parthenium (7 members)
- Parthenocissus (4 members)
- Pascalia (1 member)
- Pascopyrum (1 member)
- Paspalidium (1 member)
- Paspalum (44 members)
- Paspalum setaceum (9 members)
- Passiflora (19 members)
- Passiflora foetida (1 member)
- Passifloraceae (2 members)
- Pattalias (1 member)
- Paulownia (1 member)
- Paulowniaceae (2 members)
- Pavonia (4 members)
- Paxistima (2 members)
- Paysonia (9 members)
- Paysonia lasiocarpa (2 members)
- Pecluma (4 members)
- Pecluma ptilodon (1 member)
- Pectis (17 members)
- Pectis angustifolia (3 members)
- Pectis filipes (1 member)
- Pectis linifolia (1 member)
- Pectis papposa (2 members)
- Pedaliaceae (4 members)
- Pedicularis (48 members)
- Pedicularis attollens (2 members)
- Pedicularis bracteosa (8 members)
- Pedicularis centranthera (2 members)
- Pedicularis contorta (3 members)
- Pedicularis lanata (1 member)
- Pedicularis langsdorffii (2 members)
- Pedicularis palustris (1 member)
- Pedicularis parryi (3 members)
- Pedicularis racemosa (2 members)
- Pedicularis semibarbata (2 members)
- Pedicularis sudetica (5 members)
- Pediocactus (10 members)
- Pediocactus peeblesianus (2 members)
- Pelexia (1 member)
- Pellaea (18 members)
- Pellaea glabella (4 members)
- Pellaea mucronata (2 members)
- Pellaea ternifolia (3 members)
- Peltandra (2 members)
- Peniocereus (3 members)
- Peniocereus greggii (2 members)
- Pennellia (3 members)
- Pennisetum (18 members)
- Penstemon (4 members)
- Penstemon acuminatus (2 members)
- Penstemon ambiguus (2 members)
- Penstemon angustifolius (5 members)
- Penstemon attenuatus (4 members)
- Penstemon azureus (2 members)
- Penstemon barbatus (3 members)
- Penstemon caespitosus (3 members)
- Penstemon cardinalis (2 members)
- Penstemon clevelandii (3 members)
- Penstemon cobaea (2 members)
- Penstemon crandallii (5 members)
- Penstemon cyananthus (3 members)
- Penstemon davidsonii (3 members)
- Penstemon deustus (4 members)
- Penstemon eatonii (3 members)
- Penstemon eriantherus (5 members)
- Penstemon floridus (2 members)
- Penstemon fremontii (2 members)
- Penstemon fruticiformis (2 members)
- Penstemon fruticosus (3 members)
- Penstemon gairdneri (2 members)
- Penstemon glaber (3 members)
- Penstemon glandulosus (2 members)
- Penstemon heterodoxus (3 members)
- Penstemon heterophyllus (3 members)
- Penstemon humilis (3 members)
- Penstemon laetus (3 members)
- Penstemon laricifolius (2 members)
- Penstemon leiophyllus (3 members)
- Penstemon lentus (2 members)
- Penstemon leonardii (3 members)
- Penstemon linarioides (4 members)
- Penstemon montanus (2 members)
- Penstemon newberryi (3 members)
- Penstemon nitidus (2 members)
- Penstemon pachyphyllus (2 members)
- Penstemon palmeri (3 members)
- Penstemon procerus (6 members)
- Penstemon pseudospectabilis (2 members)
- Penstemon rattanii (2 members)
- Penstemon richardsonii (3 members)
- Penstemon rydbergii (3 members)
- Penstemon scariosus (4 members)
- Penstemon sect. Ambigui (3 members)
- Penstemon sect. Baccharifolii (1 member)
- Penstemon sect. Bridgesiani (1 member)
- Penstemon sect. Caespitosi (14 members)
- Penstemon sect. Chamaeleon (3 members)
- Penstemon sect. Coerulei (26 members)
- Penstemon sect. Cristati (35 members)
- Penstemon sect. Dissecti (1 member)
- Penstemon sect. Elmigera (7 members)
- Penstemon sect. Erianthera (14 members)
- Penstemon sect. Gentianoides (10 members)
- Penstemon sect. Glabri (49 members)
- Penstemon sect. Penstemon (70 members)
- Penstemon sect. Petiolati (1 member)
- Penstemon sect. Saccanthera (33 members)
- Penstemon sect. Spectabiles (18 members)
- Penstemon secundiflorus (2 members)
- Penstemon spectabilis (2 members)
- Penstemon subg. Dasanthera (2 members)
- Penstemon subg. Penstemon (30 members)
- Penstemon triflorus (2 members)
- Penstemon virgatus (2 members)
- Pentachaeta (7 members)
- Pentachaeta exilis (2 members)
- Pentagramma (3 members)
- Pentagramma triangularis (4 members)
- Pentalinon (1 member)
- Penthoraceae (2 members)
- Penthorum (1 member)
- Pentzia (1 member)
- Peperomia (7 members)
- Peraphyllum (1 member)
- Pereskia (3 members)
- Pereskia grandifolia (1 member)
- Pericallis (1 member)
- Pericome (1 member)
- Peritoma (7 members)
- Peritoma arborea (3 members)
- Perityle (6 members)
- Perityle bisetosa (3 members)
- Perityle gilensis (2 members)
- Perityle lindheimeri (2 members)
- Perityle megalocephala (2 members)
- Perityle microglossa (1 member)
- Perityle rupestris (2 members)
- Perityle sect. Laphamia (28 members)
- Perityle sect. Pappothrix (7 members)
- Perityle sect. Perityle (7 members)
- Perityle staurophylla (2 members)
- Persea (3 members)
- Persicaria (10 members)
- Persicaria meisneriana (1 member)
- Persicaria sect. Cephalophilon (3 members)
- Persicaria sect. Echinocaulon (6 members)
- Persicaria sect. Persicaria (16 members)
- Persicaria sect. Rubrivena (2 members)
- Persicaria sect. Tovara (1 member)
- Persicaria wallichii (1 member)
- Petalonyx (5 members)
- Petalonyx thurberi (2 members)
- Petasites (2 members)
- Petasites frigidus (4 members)
- Petiveria (1 member)
- Petradoria (2 members)
- Petradoria pumila (2 members)
- Petrogenia (1 member)
- Petrophytum (4 members)
- Petrophytum caespitosum (2 members)
- Petrorhagia (5 members)
- Petrorhagia saxifraga (1 member)
- Petunia (3 members)
- Peucephyllum (1 member)
- Phalacroseris (1 member)
- Phalaris (11 members)
- Phanerophlebia (2 members)
- Pharus (1 member)
- Phaulothamnus (1 member)
- Phedimus (3 members)
- Phegopteris (2 members)
- Phemeranthus (16 members)
- Phenology (238 members)
- Pherotrichis (1 member)
- Philadelphus (11 members)
- Philadelphus microphyllus (4 members)
- Philadelphus texensis (2 members)
- Philonotis (12 members)
- Philonotis fontana (3 members)
- Phippsia (2 members)
- Phlebodium (1 member)
- Phlegmariurus (1 member)
- Phleum (6 members)
- Phoebanthus (2 members)
- Phoenicaulis (1 member)
- Phoenix (2 members)
- Phoradendron (8 members)
- Phoradendron villosum (2 members)
- Photinia (5 members)
- Photinia davidiana (1 member)
- Phragmites (1 member)
- Phryma (2 members)
- Phryma leptostachya (1 member)
- Phrymaceae (12 members)
- Phyllanthaceae (14 members)
- Phyllanthopsis (2 members)
- Phyllanthus (20 members)
- Phyllanthus abnormis (2 members)
- Phyllanthus caroliniensis (2 members)
- Phyllanthus liebmannianus (1 member)
- Phyllanthus urinaria (1 member)
- Phyllodoce (5 members)
- Phyllospadix (3 members)
- Phyllostachys (2 members)
- Physalis (29 members)
- Physalis cinerascens (2 members)
- Physalis longifolia (3 members)
- Physalis mollis (2 members)
- Physalis pumila (2 members)
- Physalis ×elliottii (2 members)
- Physaria (104 members)
- Physaria arenosa (2 members)
- Physaria argyraea (1 member)
- Physaria carinata (3 members)
- Physaria didymocarpa (3 members)
- Physaria douglasii (2 members)
- Physaria floribunda (2 members)
- Physaria geyeri (2 members)
- Physaria gracilis (2 members)
- Physaria hemiphysaria (2 members)
- Physaria hitchcockii (3 members)
- Physaria kingii (7 members)
- Physaria lepidota (2 members)
- Physaria newberryi (2 members)
- Physaria occidentalis (2 members)
- Physaria ovalifolia (2 members)
- Physaria saximontana (2 members)
- Physcomitrella (2 members)
- Physcomitrium (4 members)
- Physocarpus (6 members)
- Phytolacca (7 members)
- Phytolacca americana (2 members)
- Phytolaccaceae (12 members)
- Picea (9 members)
- Picea engelmannii (1 member)
- Picradeniopsis (2 members)
- Picramnia (1 member)
- Picramniaceae (4 members)
- Picris (2 members)
- Picrodendraceae (2 members)
- Picrothamnus (1 member)
- Pieris (2 members)
- Pilea (5 members)
- Pilosium (1 member)
- Pilosocereus (1 member)
- Pilostyles (1 member)
- Pilotrichaceae (6 members)
- Pilularia (1 member)
- Pinaceae (12 members)
- Pinaropappus (2 members)
- Pinus (44 members)
- Pinus contorta (3 members)
- Pinus elliottii (2 members)
- Pinus leiophylla (1 member)
- Pinus ponderosa (3 members)
- Pinus sylvestris (1 member)
- Pinus torreyana (2 members)
- Piper (2 members)
- Piperaceae (4 members)
- Piperia (11 members)
- Piperia elegans (2 members)
- Piptatherum (8 members)
- Piptatherum miliaceum (2 members)
- Piptochaetium (6 members)
- Pireella (2 members)
- Piriqueta (2 members)
- Piriqueta cistoides (1 member)
- Pisonia (3 members)
- Pistia (1 member)
- Pityopsis (9 members)
- Pityopsis aspera (2 members)
- Pityopsis graminifolia (5 members)
- Pityopus (1 member)
- Pityrogramma (3 members)
- Pityrogramma calomelanos (1 member)
- Plagiobryoides (5 members)
- Plagiobryum (2 members)
- Plagiomnium (11 members)
- Plagiopus (1 member)
- Plagiotheciaceae (2 members)
- Plagiothecium (6 members)
- Planera (1 member)
- Planodes (1 member)
- Plantaginaceae (90 members)
- Plantago (32 members)
- Platanaceae (2 members)
- Platanthera (36 members)
- Platanthera blephariglottis (2 members)
- Platanthera dilatata (3 members)
- Platanthera flava (2 members)
- Platanthera tipuloides (1 member)
- Platanus (3 members)
- Plateilema (1 member)
- Plates (277 members)
- Platydictya (4 members)
- Platygyrium (2 members)
- Platylomella (1 member)
- Platyschkuhria (1 member)
- Platystemon (1 member)
- Platythelys (1 member)
- Plaubelia (2 members)
- Plaubelia sprengelii (2 members)
- Plectocephalus (2 members)
- Pleea (1 member)
- Pleiacanthus (1 member)
- Pleopeltis (6 members)
- Pleopeltis polylepis (1 member)
- Pleopeltis polypodioides (1 member)
- Pleradenophora (1 member)
- Pleuricospora (1 member)
- Pleuridium (4 members)
- Pleurochaete (1 member)
- Pleurocoronis (1 member)
- Pleuropogon (6 members)
- Pleuropogon californicus (2 members)
- Pleurothallis (1 member)
- Pleuroziopsaceae (2 members)
- Pleuroziopsis (1 member)
- Pleurozium (1 member)
- Ploidy (1 member)
- Pluchea (10 members)
- Pluchea odorata (2 members)
- Plumbaginaceae (6 members)
- Plumbago (2 members)
- Plumeria (1 member)
- Poa (7 members)
- Poa abbreviata (3 members)
- Poa alpina (2 members)
- Poa arctica (5 members)
- Poa bulbosa (2 members)
- Poa cusickii (4 members)
- Poa fendleriana (3 members)
- Poa glauca (3 members)
- Poa hartzii (3 members)
- Poa laxa (2 members)
- Poa pratensis (6 members)
- Poa saltuensis (2 members)
- Poa sect. Abbreviatae (6 members)
- Poa sect. Alpinae (2 members)
- Poa sect. Arctopoa (1 member)
- Poa sect. Arenariae (2 members)
- Poa sect. Dioicopoa (1 member)
- Poa sect. Homalopoa (10 members)
- Poa sect. Madropoa (5 members)
- Poa sect. Micrantherae (3 members)
- Poa sect. Oreinos (4 members)
- Poa sect. Pandemos (1 member)
- Poa sect. Poa (6 members)
- Poa sect. Secundae (4 members)
- Poa sect. Stenopoa (5 members)
- Poa sect. Sylvestres (8 members)
- Poa sect. Tichopoa (1 member)
- Poa secunda (2 members)
- Poa stenantha (2 members)
- Poa subg. Arctopoa (2 members)
- Poa subg. Poa (29 members)
- Poa subsect. Epiles (7 members)
- Poa subsect. Halophytae (5 members)
- Poa subsect. Madropoa (8 members)
- Poa subsect. Poa (8 members)
- Poa subsect. Secundae (7 members)
- Poa unilateralis (2 members)
- Poaceae (20 members)
- Poaceae subfam. Aristidoideae (2 members)
- Poaceae subfam. Arundinoideae (2 members)
- Poaceae subfam. Bambusoideae (4 members)
- Poaceae subfam. Centothecoideae (4 members)
- Poaceae subfam. Chloridoideae (6 members)
- Poaceae subfam. Danthonioideae (2 members)
- Poaceae subfam. Ehrhartoideae (4 members)
- Poaceae subfam. Panicoideae (6 members)
- Poaceae subfam. Pharoideae (2 members)
- Poaceae subfam. Pooideae (18 members)
- Poaceae tribe Andropogoneae (60 members)
- Poaceae tribe Aristideae (2 members)
- Poaceae tribe Arundineae (8 members)
- Poaceae tribe Bambuseae (8 members)
- Poaceae tribe Brachyelytreae (2 members)
- Poaceae tribe Brachypodieae (2 members)
- Poaceae tribe Bromeae (2 members)
- Poaceae tribe Centotheceae (2 members)
- Poaceae tribe Cynodonteae (106 members)
- Poaceae tribe Danthonieae (12 members)
- Poaceae tribe Diarrheneae (2 members)
- Poaceae tribe Ehrharteae (2 members)
- Poaceae tribe Gynerieae (2 members)
- Poaceae tribe Meliceae (8 members)
- Poaceae tribe Nardeae (2 members)
- Poaceae tribe Olyreae (2 members)
- Poaceae tribe Orcuttieae (6 members)
- Poaceae tribe Oryzeae (12 members)
- Poaceae tribe Paniceae (55 members)
- Poaceae tribe Pappophoreae (6 members)
- Poaceae tribe Phareae (2 members)
- Poaceae tribe Poeae (134 members)
- Poaceae tribe Stipeae (30 members)
- Poaceae tribe Thysanolaeneae (2 members)
- Poaceae tribe Triticeae (39 members)
- Podagrostis (2 members)
- Podophyllum (1 member)
- Podostemaceae (2 members)
- Podostemum (1 member)
- Pogonarthria (1 member)
- Pogonatum (5 members)
- Pogonia (1 member)
- Pohlia (32 members)
- Polanisia (7 members)
- Polanisia dodecandra (3 members)
- Polanisia erosa (2 members)
- Polycarpaea (1 member)
- Polycarpon (3 members)
- Polycarpon tetraphyllum (1 member)
- Polycnemum (2 members)
- Polyctenium (1 member)
- Polygala (31 members)
- Polygalaceae (12 members)
- Polygaloides (1 member)
- Polygonaceae (4 members)
- Polygonaceae subfam. Eriogonoideae (38 members)
- Polygonaceae subfam. Polygonoideae (32 members)
- Polygonatum (3 members)
- Polygonella (12 members)
- Polygonella polygama (3 members)
- Polygonum (6 members)
- Polygonum aviculare (6 members)
- Polygonum fowleri (2 members)
- Polygonum humifusum (1 member)
- Polygonum oxyspermum (2 members)
- Polygonum polygaloides (4 members)
- Polygonum ramosissimum (2 members)
- Polygonum sawatchense (2 members)
- Polygonum sect. Duravia (22 members)
- Polygonum sect. Polygonum (16 members)
- Polymnia (3 members)
- Polypodiaceae (14 members)
- Polypodiophyta (20 members)
- Polypodium (11 members)
- Polypogon (8 members)
- Polypremum (1 member)
- Polystachya (1 member)
- Polystemma (1 member)
- Polystichum (16 members)
- Polystichum imbricans (2 members)
- Polytrias (1 member)
- Polytrichaceae (18 members)
- Polytrichastrum (11 members)
- Polytrichastrum alpinum (4 members)
- Polytrichastrum formosum (2 members)
- Polytrichastrum sexangulare (2 members)
- Polytrichum (8 members)
- Polytrichum commune (2 members)
- Pontederia (1 member)
- Pontederiaceae (8 members)
- Ponthieva (2 members)
- Populus (10 members)
- Populus deltoides (3 members)
- Populus fremontii (2 members)
- Poranopsis (1 member)
- Porophyllum (6 members)
- Porophyllum ruderale (1 member)
- Porotrichum (1 member)
- Portulaca (11 members)
- Portulaca umbraticola (2 members)
- Portulacaceae (18 members)
- Position (711 members)
- Position relational (53 members)
- Potamogeton (35 members)
- Potamogeton foliosus (2 members)
- Potamogeton pusillus (3 members)
- Potamogetonaceae (4 members)
- Potentilla (43 members)
- Potentilla anserina (4 members)
- Potentilla arenosa (2 members)
- Potentilla concinna (3 members)
- Potentilla crebridens (1 member)
- Potentilla effusa (2 members)
- Potentilla glaucophylla (2 members)
- Potentilla gracilis (5 members)
- Potentilla hyparctica (2 members)
- Potentilla ovina (2 members)
- Potentilla rhyolitica (2 members)
- Potentilla sect. Arenicolae (1 member)
- Potentilla sect. Aureae (11 members)
- Potentilla sect. Biflorae (1 member)
- Potentilla sect. Brevifoliae (1 member)
- Potentilla sect. Chrysanthae (3 members)
- Potentilla sect. Concinnae (9 members)
- Potentilla sect. Graciles (9 members)
- Potentilla sect. Leucophyllae (5 members)
- Potentilla sect. Lupinoides (1 member)
- Potentilla sect. Multijugae (11 members)
- Potentilla sect. Niveae (13 members)
- Potentilla sect. Pensylvanicae (8 members)
- Potentilla sect. Pentaphylloides (2 members)
- Potentilla sect. Potentilla (5 members)
- Potentilla sect. Rectae (1 member)
- Potentilla sect. Rivales (5 members)
- Potentilla sect. Rubrae (3 members)
- Potentilla sect. Rubricaules (8 members)
- Potentilla sect. Subjugae (2 members)
- Potentilla sect. Subviscosae (9 members)
- Potentilla sect. Terminales (3 members)
- Potentilla subviscosa (2 members)
- Potentilla supina (1 member)
- Potentilla thurberi (2 members)
- Poteridium (2 members)
- Poterium (2 members)
- Poterium sanguisorba (1 member)
- Pottiaceae (10 members)
- Pottiaceae subfam. Barbuloideae (32 members)
- Pottiaceae subfam. Merceyoideae (2 members)
- Pottiaceae subfam. Pottioideae (30 members)
- Pottiaceae subfam. Timmielloideae (2 members)
- Pottiaceae subfam. Trichostomoideae (14 members)
- Pouteria (1 member)
- Pouzolzia (1 member)
- Prenanthella (1 member)
- Prenanthes (14 members)
- Prescottia (1 member)
- Primula (22 members)
- Primula cuneifolia (2 members)
- Primula cusickiana (4 members)
- Primulaceae (10 members)
- Prosartes (5 members)
- Proserpinaca (2 members)
- Prosthechea (5 members)
- Prosthechea boothiana (1 member)
- Prosthechea cochleata (1 member)
- Proteaceae (2 members)
- Prunus (49 members)
- Prunus fasciculata (2 members)
- Prunus ilicifolia (2 members)
- Prunus pumila (4 members)
- Prunus serotina (3 members)
- Prunus virginiana (2 members)
- Psacalium (1 member)
- Psathyrostachys (1 member)
- Psathyrotes (3 members)
- Psathyrotopsis (1 member)
- Pseudabutilon (2 members)
- Pseudelephantopus (1 member)
- Pseudephemerum (1 member)
- Pseudobahia (3 members)
- Pseudobraunia (1 member)
- Pseudobryum (1 member)
- Pseudocalliergon (4 members)
- Pseudocampylium (1 member)
- Pseudoclappia (2 members)
- Pseudocrossidium (4 members)
- Pseudocryphaea (1 member)
- Pseudocydonia (1 member)
- Pseudoditrichaceae (2 members)
- Pseudoditrichum (1 member)
- Pseudognaphalium (21 members)
- Pseudogynoxys (1 member)
- Pseudoleskea (10 members)
- Pseudoleskea incurvata (3 members)
- Pseudoleskea radicosa (3 members)
- Pseudoleskeella (4 members)
- Pseudolycopodiella (1 member)
- Pseudophoenix (2 members)
- Pseudophoenix sargentii (1 member)
- Pseudorchis (2 members)
- Pseudorchis albida (1 member)
- Pseudoroegneria (1 member)
- Pseudorontium (1 member)
- Pseudosasa (1 member)
- Pseudoscleropodium (1 member)
- Pseudostellaria (3 members)
- Pseudotaxiphyllum (3 members)
- Pseudotsuga (3 members)
- Pseudotsuga menziesii (2 members)
- Psidium (2 members)
- Psilactis (5 members)
- Psilocarphus (6 members)
- Psilocarphus brevissimus (2 members)
- Psilopilum (2 members)
- Psilostrophe (6 members)
- Psilotaceae (2 members)
- Psilotophyta (1 member)
- Psilotum (1 member)
- Pteridaceae (26 members)
- Pteridium (2 members)
- Pteridium aquilinum (4 members)
- Pteridophytes (4 members)
- Pterigynandraceae (8 members)
- Pterigynandrum (1 member)
- Pteris (6 members)
- Pteris cretica (2 members)
- Pterobryaceae (6 members)
- Pterocaulon (2 members)
- Pteroglossaspis (1 member)
- Pterospora (1 member)
- Pterostegia (1 member)
- Pterygoneurum (5 members)
- Pterygoneurum subsessile (2 members)
- Ptilagrostis (2 members)
- Ptilium (1 member)
- Ptychomitriaceae (4 members)
- Ptychomitrium (5 members)
- Ptychosperma (2 members)
- Ptychostomum (4 members)
- Ptychostomum subg. Cladodium (16 members)
- Ptychostomum subg. Ptychostomum (15 members)
- Puccinellia (21 members)
- Pulicaria (1 member)
- Punica (1 member)
- Purshia (5 members)
- Purshia tridentata (2 members)
- Putranjivaceae (2 members)
- Pylaisia (4 members)
- Pylaisiadelpha (1 member)
- Pyracantha (6 members)
- Pyramidula (1 member)
- Pyrola (8 members)
- Pyrola asarifolia (2 members)
- Pyrrhobryum (1 member)
- Pyrrhopappus (4 members)
- Pyrrocoma (21 members)
- Pyrrocoma carthamoides (3 members)
- Pyrrocoma clementis (2 members)
- Pyrrocoma crocea (2 members)
- Pyrrocoma hirta (3 members)
- Pyrrocoma lanceolata (2 members)
- Pyrrocoma racemosa (5 members)
- Pyrrocoma uniflora (2 members)
- Pyrularia (1 member)
- Pyrus (6 members)
- Pyxidanthera (2 members)
- Quadrella (2 members)
- Quantity (653 members)
- Quercus (6 members)
- Quercus durata (2 members)
- Quercus garryana (3 members)
- Quercus sect. Lobatae (35 members)
- Quercus sect. Protobalanus (4 members)
- Quercus sect. Quercus (54 members)
- Quercus sinuata (2 members)
- Quincula (1 member)
- Racomitrium (1 member)
- Racopilaceae (2 members)
- Racopilum (1 member)
- Radiola (1 member)
- Rafinesquia (2 members)
- Raillardella (3 members)
- Rainiera (1 member)
- Ranunculaceae (44 members)
- Ranunculus (18 members)
- Ranunculus acriformis (3 members)
- Ranunculus alismifolius (6 members)
- Ranunculus aquatilis (2 members)
- Ranunculus arizonicus (1 member)
- Ranunculus bonariensis (1 member)
- Ranunculus californicus (2 members)
- Ranunculus canus (2 members)
- Ranunculus eschscholtzii (5 members)
- Ranunculus flammula (3 members)
- Ranunculus glaberrimus (2 members)
- Ranunculus glacialis (2 members)
- Ranunculus harveyi (1 member)
- Ranunculus hispidus (3 members)
- Ranunculus inamoenus (2 members)
- Ranunculus occidentalis (7 members)
- Ranunculus orthorhynchus (3 members)
- Ranunculus pedatifidus (1 member)
- Ranunculus recurvatus (1 member)
- Ranunculus sceleratus (2 members)
- Ranunculus sect. Arcteranthis (1 member)
- Ranunculus sect. Cyrtorhyncha (1 member)
- Ranunculus sect. Echinella (8 members)
- Ranunculus sect. Epirotes (28 members)
- Ranunculus sect. Flammula (13 members)
- Ranunculus sect. Halodes (1 member)
- Ranunculus sect. Hecatonia (5 members)
- Ranunculus sect. Pseudaphanostemma (1 member)
- Ranunculus sect. Ranunculus (26 members)
- Ranunculus subg. Batrachium (4 members)
- Ranunculus subg. Ceratocephala (1 member)
- Ranunculus subg. Coptidium (1 member)
- Ranunculus subg. Crymodes (3 members)
- Ranunculus subg. Cyrtorhyncha (8 members)
- Ranunculus subg. Ficaria (1 member)
- Ranunculus subg. Oxygraphis (1 member)
- Ranunculus subg. Pallasiantha (1 member)
- Ranunculus subg. Ranunculus (10 members)
- Raphanus (2 members)
- Rapistrum (1 member)
- Ratibida (5 members)
- Ratibida peduncularis (2 members)
- Rauiella (2 members)
- Rauvolfia (1 member)
- Rayjacksonia (3 members)
- Redfieldia (1 member)
- Reference (6,778 members)
- Reimarochloa (1 member)
- Remirea (1 member)
- Reseda (4 members)
- Resedaceae (4 members)
- Revised Since Print (1,287 members)
- Reynosia (1 member)
- Rhabdadenia (1 member)
- Rhabdoweisia (2 members)
- Rhachitheciaceae (2 members)
- Rhachithecium (1 member)
- Rhagadiolus (1 member)
- Rhamnaceae (30 members)
- Rhamnus (16 members)
- Rhamnus davurica (1 member)
- Rhamnus utilis (1 member)
- Rhapidophyllum (1 member)
- Rheum (1 member)
- Rhexia (14 members)
- Rhexia mariana (2 members)
- Rhexophyllum (1 member)
- Rhinanthus (3 members)
- Rhinanthus minor (2 members)
- Rhinotropis (16 members)
- Rhinotropis cornuta (2 members)
- Rhinotropis lindheimeri (2 members)
- Rhinotropis nitida (2 members)
- Rhinotropis rimulicola (2 members)
- Rhizogoniaceae (2 members)
- Rhizomnium (8 members)
- Rhizophora (1 member)
- Rhizophoraceae (2 members)
- Rhodiola (4 members)
- Rhodiola integrifolia (3 members)
- Rhodobryum (2 members)
- Rhododendron (26 members)
- Rhododendron minus (2 members)
- Rhodomyrtus (2 members)
- Rhodomyrtus tomentosa (1 member)
- Rhodotypos (1 member)
- Rhynchosida (1 member)
- Rhynchospora (70 members)
- Rhynchospora globularis (3 members)
- Rhynchospora harveyi (2 members)
- Rhynchostegium (2 members)
- Rhytidiaceae (2 members)
- Rhytidiadelphus (5 members)
- Rhytidiopsis (1 member)
- Rhytidium (1 member)
- Ribes (61 members)
- Ribes aureum (3 members)
- Ribes californicum (2 members)
- Ribes cereum (2 members)
- Ribes divaricatum (3 members)
- Ribes inerme (2 members)
- Ribes oxyacanthoides (5 members)
- Ribes roezlii (3 members)
- Ribes sanguineum (2 members)
- Ricinus (1 member)
- Rigiopappus (1 member)
- Rivina (1 member)
- Roellobryaceae (2 members)
- Roellobryon (1 member)
- Roemeria (1 member)
- Roldana (1 member)
- Romneya (2 members)
- Romulea (1 member)
- Rorippa (23 members)
- Rorippa palustris (2 members)
- Rosa (5 members)
- Rosa acicularis (2 members)
- Rosa carolina (2 members)
- Rosa gymnocarpa (2 members)
- Rosa nutkana (3 members)
- Rosa pisocarpa (2 members)
- Rosa rubiginosa (2 members)
- Rosa sect. Bracteatae (1 member)
- Rosa sect. Caninae (6 members)
- Rosa sect. Gallicae (1 member)
- Rosa sect. Laevigatae (1 member)
- Rosa sect. Minutifoliae (3 members)
- Rosa sect. Pimpinellifoliae (1 member)
- Rosa sect. Rosa (25 members)
- Rosa sect. Systylae (3 members)
- Rosa stellata (3 members)
- Rosa subg. Hesperhodos (2 members)
- Rosa subg. Rosa (13 members)
- Rosa woodsii (6 members)
- Rosaceae (6 members)
- Rosaceae subfam. Amygdaloideae (16 members)
- Rosaceae subfam. Dryadoideae (2 members)
- Rosaceae subfam. Rosoideae (12 members)
- Rosaceae tribe Agrimonieae (10 members)
- Rosaceae tribe Amygdaleae (2 members)
- Rosaceae tribe Colurieae (8 members)
- Rosaceae tribe Dryadeae (8 members)
- Rosaceae tribe Exochordeae (4 members)
- Rosaceae tribe Gillenieae (38 members)
- Rosaceae tribe Kerrieae (8 members)
- Rosaceae tribe Lyonothamneae (2 members)
- Rosaceae tribe Neillieae (4 members)
- Rosaceae tribe Potentilleae (28 members)
- Rosaceae tribe Roseae (2 members)
- Rosaceae tribe Rubeae (2 members)
- Rosaceae tribe Sorbarieae (6 members)
- Rosaceae tribe Spiraeeae (12 members)
- Rosaceae tribe Ulmarieae (2 members)
- Rostraria (1 member)
- Rosulabryum (13 members)
- Rotala (3 members)
- Rottboellia (1 member)
- Roystonea (1 member)
- Rubus (40 members)
- Rubus arcticus (3 members)
- Rubus idaeus (2 members)
- Rubus leucodermis (2 members)
- Rudbeckia (6 members)
- Rudbeckia fulgida (7 members)
- Rudbeckia grandiflora (2 members)
- Rudbeckia hirta (4 members)
- Rudbeckia laciniata (5 members)
- Rudbeckia sect. Dracopis (1 member)
- Rudbeckia sect. Macrocline (14 members)
- Rudbeckia sect. Rudbeckia (13 members)
- Rudbeckia triloba (3 members)
- Rugelia (1 member)
- Rugosa (1 member)
- Rumex (8 members)
- Rumex sect. Axillares (21 members)
- Rumex sect. Rumex (32 members)
- Rumex subg. Acetosa (5 members)
- Rumex subg. Acetosella (4 members)
- Rumex subg. Platypodium (1 member)
- Rumex subg. Rumex (4 members)
- Ruppia (2 members)
- Ruppiaceae (2 members)
- Russelia (1 member)
- Rutenbergiaceae (2 members)
- Rytidosperma (3 members)
- Sabal (5 members)
- Sabatia (21 members)
- Sabatia macrophylla (2 members)
- Saccharum (10 members)
- Saccharum brevibarbe (2 members)
- Sacciolepis (2 members)
- Sachsia (1 member)
- Sacoila (3 members)
- Sacoila lanceolata (2 members)
- Saelania (1 member)
- Sageretia (3 members)
- Sagina (13 members)
- Sagina decumbens (2 members)
- Sagina maxima (2 members)
- Sagina nodosa (2 members)
- Sagittaria (28 members)
- Sagittaria graminea (3 members)
- Sagittaria guayanensis (1 member)
- Sagittaria lancifolia (2 members)
- Sagittaria montevidensis (3 members)
- Sairocarpus (11 members)
- Sairocarpus cornutus (2 members)
- Sairocarpus vexillocalyculatus (3 members)
- Salicaceae (8 members)
- Salicornia (4 members)
- Salix (10 members)
- Salix alaxensis (2 members)
- Salix brachycarpa (2 members)
- Salix calcicola (2 members)
- Salix exigua (2 members)
- Salix glauca (4 members)
- Salix humilis (2 members)
- Salix lasiandra (2 members)
- Salix ovalifolia (4 members)
- Salix rotundifolia (2 members)
- Salix sect. Arbuscella (1 member)
- Salix sect. Argyrocarpae (1 member)
- Salix sect. Canae (1 member)
- Salix sect. Candidae (1 member)
- Salix sect. Chamaetia (3 members)
- Salix sect. Cinerella (10 members)
- Salix sect. Cordatae (7 members)
- Salix sect. Daphnella (1 member)
- Salix sect. Diplodictyae (4 members)
- Salix sect. Floridanae (1 member)
- Salix sect. Fulvae (1 member)
- Salix sect. Geyerianae (3 members)
- Salix sect. Glaucae (5 members)
- Salix sect. Griseae (1 member)
- Salix sect. Hastatae (18 members)
- Salix sect. Helix (1 member)
- Salix sect. Herbella (5 members)
- Salix sect. Humboldtianae (7 members)
- Salix sect. Lanatae (4 members)
- Salix sect. Maccallianae (1 member)
- Salix sect. Mexicanae (3 members)
- Salix sect. Myrtilloides (4 members)
- Salix sect. Myrtosalix (5 members)
- Salix sect. Nigricantes (1 member)
- Salix sect. Ovalifoliae (4 members)
- Salix sect. Phylicifoliae (5 members)
- Salix sect. Salicaster (5 members)
- Salix sect. Salix (4 members)
- Salix sect. Setchellianae (1 member)
- Salix sect. Sitchenses (4 members)
- Salix sect. Subalbae (3 members)
- Salix sect. Triandrae (1 member)
- Salix sect. Villosae (4 members)
- Salix sect. Viminella (1 member)
- Salix subg. Chamaetia (16 members)
- Salix subg. Longifoliae (8 members)
- Salix subg. Protitea (4 members)
- Salix subg. Salix (10 members)
- Salix subg. Vetrix (38 members)
- Salix wolfii (2 members)
- Salpichroa (1 member)
- Salsola (7 members)
- Salsola kali (2 members)
- Salvinia (1 member)
- Salviniaceae (2 members)
- Samolus (3 members)
- Sandbergia (2 members)
- Sanguinaria (1 member)
- Sanguisorba (4 members)
- Sanionia (4 members)
- Sansevieria (1 member)
- Santalaceae (4 members)
- Santalum (1 member)
- Santolina (1 member)
- Sanvitalia (3 members)
- Saponaria (2 members)
- Sapotaceae (10 members)
- Sarcobatus (2 members)
- Sarcocornia (3 members)
- Sarcodes (1 member)
- Sarmentypnum (5 members)
- Sarracenia (14 members)
- Sarracenia alabamensis (2 members)
- Sarracenia purpurea (2 members)
- Sarracenia rubra (2 members)
- Sarraceniaceae (4 members)
- Sartwellia (1 member)
- Sassafras (1 member)
- Saururaceae (4 members)
- Saururus (1 member)
- Saussurea (8 members)
- Saussurea amara (1 member)
- Saussurea angustifolia (3 members)
- Saxifraga (29 members)
- Saxifraga bronchialis (2 members)
- Saxifraga flagellaris (3 members)
- Saxifraga oppositifolia (2 members)
- Saxifraga rivularis (2 members)
- Saxifragaceae (46 members)
- Saxifragopsis (1 member)
- Scabrethia (2 members)
- Scabrethia scabra (3 members)
- Schaefferia (2 members)
- Schedonnardus (1 member)
- Schedonorus (3 members)
- Schenkia (1 member)
- Scheuchzeria (1 member)
- Scheuchzeriaceae (2 members)
- Schiedeella (1 member)
- Schisandra (1 member)
- Schisandraceae (2 members)
- Schismus (2 members)
- Schistidium (30 members)
- Schistophragma (1 member)
- Schistostega (1 member)
- Schistostegaceae (2 members)
- Schizachne (1 member)
- Schizachyrium (11 members)
- Schizachyrium sanguineum (2 members)
- Schizachyrium scoparium (3 members)
- Schizaea (1 member)
- Schizaeaceae (4 members)
- Schizanthus (1 member)
- Schkuhria (2 members)
- Schlotheimia (2 members)
- Schoenobryum (1 member)
- Schoenocaulon (3 members)
- Schoenolirion (3 members)
- Schoenoplectus (8 members)
- Schoenoplectus acutus (2 members)
- Schoenoplectus erectus (1 member)
- Schoenoplectus purshianus (2 members)
- Schoenoplectus sect. Actaeogeton (5 members)
- Schoenoplectus sect. Malacogeton (3 members)
- Schoenoplectus sect. Schoenoplectus (9 members)
- Schoenoplectus sect. Supini (4 members)
- Schoenoplectus smithii (3 members)
- Schoenus (1 member)
- Schoepfia (1 member)
- Schoepfiaceae (2 members)
- Schwalbea (1 member)
- Schwetschkeopsis (1 member)
- Scilla (1 member)
- Scirpus (18 members)
- Sciuro-hypnum (11 members)
- Scleranthus (4 members)
- Scleranthus annuus (1 member)
- Scleranthus perennis (1 member)
- Scleria (16 members)
- Scleria ciliata (3 members)
- Scleria pauciflora (2 members)
- Sclerocactus (15 members)
- Sclerocarpus (1 member)
- Sclerochloa (1 member)
- Sclerolepis (1 member)
- Sclerolinon (1 member)
- Scleropodium (7 members)
- Scleropodium touretii (2 members)
- Scleropogon (1 member)
- Scoliopus (2 members)
- Scolochloa (1 member)
- Scolymus (2 members)
- Scoparia (2 members)
- Scopelophila (2 members)
- Scopulophila (1 member)
- Scorpidium (3 members)
- Scorzonera (2 members)
- Scouleria (2 members)
- Scouleriaceae (2 members)
- Scribneria (1 member)
- Scrophularia (11 members)
- Scrophulariaceae (18 members)
- Secale (2 members)
- Sedella (3 members)
- Sedum (49 members)
- Sedum lanceolatum (2 members)
- Sedum laxum (5 members)
- Sedum obtusatum (4 members)
- Sedum oreganum (2 members)
- Sedum radiatum (3 members)
- Sedum spathulifolium (2 members)
- Sedum stenopetalum (2 members)
- Sedum wrightii (2 members)
- Selaginella (6 members)
- Selaginella arenicola (2 members)
- Selaginella mutica (2 members)
- Selaginella subg. Selaginella (1 member)
- Selaginella subg. Stachygynandrum (11 members)
- Selaginella subg. Tetragonostachys (29 members)
- Selaginellaceae (2 members)
- Selenia (4 members)
- Selenicereus (3 members)
- Seligeria (13 members)
- Seligeriaceae (6 members)
- Sematophyllaceae (18 members)
- Sematophyllum (4 members)
- Sempervivum (1 member)
- Senecio (63 members)
- Senecio amplectens (2 members)
- Senecio bigelovii (2 members)
- Senecio eremophilus (3 members)
- Senecio flaccidus (3 members)
- Senecio fremontii (4 members)
- Senecio integerrimus (5 members)
- Senecio multidentatus (1 member)
- Senecio serra (2 members)
- Sequoia (1 member)
- Sequoiadendron (1 member)
- Serenoa (1 member)
- Sericocarpus (6 members)
- Sericocarpus oregonensis (2 members)
- Sesamum (1 member)
- Sesleria (4 members)
- Sesuvium (4 members)
- Setaria (8 members)
- Setaria pumila (2 members)
- Setaria reverchonii (3 members)
- Setaria subg. Paurochaetium (1 member)
- Setaria subg. Ptychophyllum (3 members)
- Setaria subg. Reverchoniae (2 members)
- Setaria subg. Setaria (24 members)
- Setaria viridis (2 members)
- Setariopsis (1 member)
- Seymeria (7 members)
- Seymeria falcata (1 member)
- Seymeria pectinata (2 members)
- Shape (126 members)
- Shepherdia (3 members)
- Shinnersia (1 member)
- Shinnersoseris (1 member)
- Shortia (2 members)
- Shortia galacifolia (2 members)
- Sibara (2 members)
- Sibaropsis (1 member)
- Sibbaldia (1 member)
- Sibbaldiopsis (1 member)
- Sicyos (4 members)
- Sicyosperma (1 member)
- Sida (20 members)
- Sida elliottii (2 members)
- Sidalcea (36 members)
- Sidalcea asprella (2 members)
- Sidalcea calycosa (2 members)
- Sidalcea hickmanii (7 members)
- Sidalcea malviflora (7 members)
- Sidalcea oregana (5 members)
- Sidastrum (1 member)
- Sideroxylon (13 members)
- Sideroxylon lanuginosum (3 members)
- Sideroxylon reclinatum (2 members)
- Sidotheca (3 members)
- Sieversia (1 member)
- Silene (83 members)
- Silene campanulata (0 members)
- Silene caroliniana (3 members)
- Silene conica (1 member)
- Silene dichotoma (1 member)
- Silene douglasii (3 members)
- Silene drummondii (2 members)
- Silene flos-cuculi (1 member)
- Silene greenei (2 members)
- Silene hookeri (2 members)
- Silene involucrata (2 members)
- Silene laciniata (3 members)
- Silene scouleri (3 members)
- Silene uralensis (3 members)
- Silene viscaria (1 member)
- Silphium (17 members)
- Silphium asteriscus (5 members)
- Silphium integrifolium (2 members)
- Silphium perfoliatum (2 members)
- Silphium radula (2 members)
- Silphium terebinthinaceum (2 members)
- Silybum (1 member)
- Simmondsia (1 member)
- Simmondsiaceae (2 members)
- Simsia (2 members)
- Sinapis (2 members)
- Sinosenecio (1 member)
- Sisymbrium (8 members)
- Sisyrinchium (39 members)
- Sisyrinchium idahoense (4 members)
- Sisyrinchium montanum (2 members)
- Size (1,454 members)
- Smallanthus (1 member)
- Smelowskia (7 members)
- Smilacaceae (2 members)
- Smilax (20 members)
- Solanaceae (54 members)
- Solanum (55 members)
- Solanum carolinense (2 members)
- Solanum citrullifolium (2 members)
- Solanum tenuipes (2 members)
- Soleirolia (1 member)
- Solidago (4 members)
- Solidago (sect. Solidago) ser. Argutae (9 members)
- Solidago (sect. Solidago) ser. Auriculatae (1 member)
- Solidago (sect. Solidago) ser. Brachychaeta (1 member)
- Solidago (sect. Solidago) ser. Drummondiani (1 member)
- Solidago (sect. Solidago) ser. Odorae (2 members)
- Solidago (sect. Solidago) ser. Venosae (7 members)
- Solidago altissima (2 members)
- Solidago arguta (4 members)
- Solidago arguta subsp. arguta (2 members)
- Solidago arguta subsp. caroliniana (2 members)
- Solidago caesia (2 members)
- Solidago canadensis (2 members)
- Solidago curtisii (2 members)
- Solidago lepida (4 members)
- Solidago nemoralis (2 members)
- Solidago odora (2 members)
- Solidago patula (2 members)
- Solidago puberula (2 members)
- Solidago rigida (3 members)
- Solidago rugosa (6 members)
- Solidago rugosa subsp. aspera (1 member)
- Solidago rugosa subsp. rugosa (2 members)
- Solidago sect. Ptarmicoidei (7 members)
- Solidago sect. Solidago (22 members)
- Solidago sempervirens (2 members)
- Solidago simplex (9 members)
- Solidago speciosa (4 members)
- Solidago stricta (2 members)
- Solidago subsect. Argutae (6 members)
- Solidago subsect. Glomeruliflorae (10 members)
- Solidago subsect. Humiles (6 members)
- Solidago subsect. Junceae (7 members)
- Solidago subsect. Maritimae (6 members)
- Solidago subsect. Multiradiatae (3 members)
- Solidago subsect. Nemorales (7 members)
- Solidago subsect. Squarrosae (11 members)
- Solidago subsect. Thyrsiflorae (3 members)
- Solidago subsect. Triplinerviae (14 members)
- Solidago subsect. Venosae (6 members)
- Solidago ulmifolia (2 members)
- Solidago velutina (2 members)
- Soliva (3 members)
- Solmsiella (1 member)
- Some measurement (129 members)
- Sonchus (6 members)
- Sonchus arvensis (2 members)
- Sophronanthe (2 members)
- Sorbaria (2 members)
- Sorbus (6 members)
- Sorbus sect. Commixtae (4 members)
- Sorbus sect. Sambucifoliae (1 member)
- Sorbus sect. Sorbus (2 members)
- Sorbus sect. Tianshanicae (2 members)
- Sorbus sitchensis (2 members)
- Sorbus subg. Aria (1 member)
- Sorbus subg. Sorbus (8 members)
- Sorbus subg. Torminaria (1 member)
- Sorghastrum (3 members)
- Sorghum (3 members)
- Sorghum bicolor (3 members)
- Sparaxis (1 member)
- Sparganiaceae (2 members)
- Sparganium (9 members)
- Spartina (13 members)
- Spergula (3 members)
- Spergularia (15 members)
- Spergularia canadensis (2 members)
- Spergularia macrotheca (3 members)
- Spergularia media (1 member)
- Spergularia platensis (1 member)
- Sphaeralcea (33 members)
- Sphaeralcea ambigua (3 members)
- Sphaeralcea angustifolia (2 members)
- Sphaeralcea caespitosa (2 members)
- Sphaeralcea coccinea (2 members)
- Sphaeralcea coulteri (1 member)
- Sphaeralcea fendleri (3 members)
- Sphaeralcea rusbyi (2 members)
- Sphaeromeria (9 members)
- Sphaeromeria potentilloides (2 members)
- Sphagnaceae (2 members)
- Sphagneticola (1 member)
- Sphagnum (18 members)
- Sphagnum fimbriatum (2 members)
- Sphagnum majus (2 members)
- Sphagnum sect. Acutifolia (26 members)
- Sphagnum sect. Cuspidata (30 members)
- Sphagnum sect. Insulosa (1 member)
- Sphagnum sect. Isocladus (2 members)
- Sphagnum sect. Polyclada (1 member)
- Sphagnum sect. Rigida (2 members)
- Sphagnum sect. Sphagnum (12 members)
- Sphagnum sect. Squarrosa (4 members)
- Sphagnum sect. Subsecunda (13 members)
- Sphenoclea (1 member)
- Sphenocleaceae (2 members)
- Sphenopholis (6 members)
- Spigelia (7 members)
- Spinacia (1 member)
- Spiraea (21 members)
- Spiraea alba (2 members)
- Spiraea douglasii (3 members)
- Spiraea splendens (2 members)
- Spiraea tomentosa (2 members)
- Spiranthes (26 members)
- Spiranthes casei (2 members)
- Spiranthes lacera (2 members)
- Spiranthes ovalis (2 members)
- Spirodela (2 members)
- Splachnaceae (10 members)
- Splachnobryaceae (2 members)
- Splachnobryum (1 member)
- Splachnum (6 members)
- Spodiopogon (1 member)
- Sporobolus (34 members)
- Sporobolus compositus (3 members)
- Sporobolus vaginiflorus (2 members)
- Stanleya (8 members)
- Stanleya pinnata (3 members)
- Staphylea (2 members)
- Staphyleaceae (2 members)
- Stebbinsoseris (2 members)
- Stegonia (3 members)
- Stegonia latifolia (2 members)
- Steinchisma (1 member)
- Stellaria (32 members)
- Stellaria borealis (2 members)
- Stellaria cuspidata (2 members)
- Stellaria longipes (2 members)
- Stemodia (3 members)
- Stemonaceae (2 members)
- Stenanthium (2 members)
- Stenocereus (1 member)
- Stenogonum (2 members)
- Stenorrhynchos (1 member)
- Stenotaphrum (1 member)
- Stenotus (5 members)
- Stenotus armerioides (2 members)
- Stenotus lanuginosus (2 members)
- Stephanomeria (16 members)
- Stephanomeria exigua (5 members)
- Stephanomeria virgata (2 members)
- Stereophyllaceae (6 members)
- Stereophyllum (1 member)
- Stevia (10 members)
- Stevia ovata (1 member)
- Stevia plummerae (1 member)
- Stevia salicifolia (1 member)
- Stewartia (2 members)
- Stictocardia (1 member)
- Stillingia (7 members)
- Stipa (2 members)
- Stipulicida (2 members)
- Stipulicida setacea (2 members)
- Stokesia (1 member)
- Straminergon (1 member)
- Streptanthella (1 member)
- Streptanthus (39 members)
- Streptanthus carinatus (2 members)
- Streptanthus cordatus (2 members)
- Streptanthus glandulosus (8 members)
- Streptanthus insignis (2 members)
- Streptopus (3 members)
- Striga (2 members)
- Strigosella (1 member)
- Structure (14 members)
- Strychnos (1 member)
- Stuckenia (5 members)
- Stuckenia filiformis (3 members)
- Stylisma (8 members)
- Stylisma patens (2 members)
- Stylisma pickeringii (2 members)
- Stylocline (7 members)
- Stylomecon (1 member)
- Stylophorum (1 member)
- Styracaceae (4 members)
- Styrax (6 members)
- Styrax platanifolius (4 members)
- Suaeda (6 members)
- Suaeda sect. Brezia (6 members)
- Suaeda sect. Limbogermen (5 members)
- Suaeda sect. Schanginia (1 member)
- Subularia (2 members)
- Subularia aquatica (1 member)
- Suckleya (1 member)
- Suksdorfia (2 members)
- Sullivantia (4 members)
- Sullivantia hapemanii (2 members)
- Suriana (1 member)
- Surianaceae (2 members)
- Swallenia (1 member)
- Swertia (1 member)
- Syagrus (1 member)
- Symblepharis (1 member)
- Symphyotrichum (10 members)
- Symphyotrichum concolor (2 members)
- Symphyotrichum drummondii (2 members)
- Symphyotrichum ericoides (2 members)
- Symphyotrichum falcatum (2 members)
- Symphyotrichum foliaceum (4 members)
- Symphyotrichum laeve (4 members)
- Symphyotrichum lanceolatum (5 members)
- Symphyotrichum novi-belgii (4 members)
- Symphyotrichum ontarionis (2 members)
- Symphyotrichum patens (3 members)
- Symphyotrichum pilosum (2 members)
- Symphyotrichum puniceum (2 members)
- Symphyotrichum sect. Conyzopsis (3 members)
- Symphyotrichum sect. Occidentales (14 members)
- Symphyotrichum sect. Symphyotrichum (43 members)
- Symphyotrichum spathulatum (3 members)
- Symphyotrichum subg. Ascendentes (2 members)
- Symphyotrichum subg. Astropolium (5 members)
- Symphyotrichum subg. Chapmaniani (1 member)
- Symphyotrichum subg. Symphyotrichum (6 members)
- Symphyotrichum subg. Virgulus (24 members)
- Symphyotrichum subulatum (5 members)
- Symphyotrichum tenuifolium (2 members)
- Symplocaceae (2 members)
- Symplocarpus (1 member)
- Symplocos (2 members)
- Synedrella (1 member)
- Syngonanthus (1 member)
- Synthlipsis (1 member)
- Synthyris (20 members)
- Synthyris missurica (3 members)
- Syntrichia (17 members)
- Syntrichopappus (2 members)
- Syringodium (1 member)
- Syrrhopodon (7 members)
- Syrrhopodon prolifer (1 member)
- Systenotheca (1 member)
- Syzygium (3 members)
- Tabernaemontana (2 members)
- Taeniatherum (1 member)
- Tagetes (4 members)
- Takakia (2 members)
- Takakiaceae (2 members)
- Talinopsis (1 member)
- Talinum (2 members)
- Talipariti (2 members)
- Talipariti tiliaceum (2 members)
- Tamaricaceae (2 members)
- Tamarix (8 members)
- Tamaulipa (1 member)
- Tanacetum (4 members)
- Taraxacum (15 members)
- Taraxia (4 members)
- Tarenaya (2 members)
- Taxaceae (4 members)
- Taxiphyllum (4 members)
- Taxithelium (1 member)
- Taxodium (2 members)
- Taxodium distichum (2 members)
- Taxus (3 members)
- Tayloria (6 members)
- Tectaria (4 members)
- Teesdalia (2 members)
- Telesonix (2 members)
- Tellima (1 member)
- Tephroseris (6 members)
- Terminalia (4 members)
- Tetrachondraceae (2 members)
- Tetracoccus (3 members)
- Tetradymia (11 members)
- Tetradymia axillaris (2 members)
- Tetragonia (1 member)
- Tetragonotheca (4 members)
- Tetraneuris (12 members)
- Tetraneuris acaulis (4 members)
- Tetraneuris linearifolia (2 members)
- Tetraneuris scaposa (2 members)
- Tetraphidaceae (4 members)
- Tetraphis (3 members)
- Tetraphis pellucida (2 members)
- Tetraplodon (5 members)
- Tetrapteron (2 members)
- Tetrazygia (1 member)
- Tetrodontium (3 members)
- Tetrodontium brownianum (2 members)
- Texture (501 members)
- Thalassia (1 member)
- Thalia (2 members)
- Thalictrum (12 members)
- Thalictrum sect. Anemonella (1 member)
- Thalictrum sect. Heterogamia (11 members)
- Thalictrum sect. Leucocoma (5 members)
- Thalictrum sect. Omalophysa (1 member)
- Thalictrum sect. Physocarpum (2 members)
- Thalictrum sect. Thalictrum (2 members)
- Thamnobryum (2 members)
- Theaceae (6 members)
- Thelesperma (9 members)
- Thelia (3 members)
- Theliaceae (2 members)
- Thelocactus (2 members)
- Thelocactus bicolor (2 members)
- Thelypodiopsis (9 members)
- Thelypodium (19 members)
- Thelypodium howellii (2 members)
- Thelypodium integrifolium (5 members)
- Thelypodium sagittatum (2 members)
- Thelypteridaceae (6 members)
- Thelypteris (16 members)
- Thelypteris grandis (1 member)
- Thelypteris hispidula (1 member)
- Thelypteris ovata (2 members)
- Thelypteris palustris (1 member)
- Thelypteris patens (1 member)
- Thelypteris pilosa (1 member)
- Thelypteris puberula (1 member)
- Thelypteris subg. Amauropelta (1 member)
- Thelypteris subg. Cyclosorus (14 members)
- Thelypteris subg. Goniopteris (3 members)
- Thelypteris subg. Lastrea (1 member)
- Thelypteris subg. Meniscium (2 members)
- Thelypteris subg. Parathelypteris (3 members)
- Thelypteris subg. Stegnogramma (2 members)
- Thelypteris subg. Thelypteris (2 members)
- Themeda (3 members)
- Theophrastaceae (6 members)
- Therorhodion (2 members)
- Thesiaceae (4 members)
- Thesium (1 member)
- Thespesia (1 member)
- Thevetia (1 member)
- Thinopyrum (5 members)
- Thinopyrum intermedium (2 members)
- Thismia (1 member)
- Thladiantha (1 member)
- Thlaspi (2 members)
- Thrinax (2 members)
- Thuidiaceae (8 members)
- Thuidium (5 members)
- Thuidium delicatulum (2 members)
- Thuja (2 members)
- Thurovia (1 member)
- Thymelaea (1 member)
- Thymelaeaceae (8 members)
- Thymophylla (12 members)
- Thymophylla aurea (2 members)
- Thymophylla pentachaeta (4 members)
- Thymophylla setifolia (1 member)
- Thymophylla tenuiloba (4 members)
- Thyrsanthella (1 member)
- Thysanocarpus (5 members)
- Thysanocarpus laciniatus (3 members)
- Thysanolaena (1 member)
- Tiarella (3 members)
- Tiarella trifoliata (3 members)
- Tidestromia (4 members)
- Tidestromia suffruticosa (2 members)
- Tilia (1 member)
- Tillandsia (16 members)
- Tillandsia fasciculata (3 members)
- Timmia (6 members)
- Timmia megapolitana (2 members)
- Timmia norvegica (2 members)
- Timmiaceae (2 members)
- Timmiella (2 members)
- Tinantia (1 member)
- Tipularia (1 member)
- Tithonia (3 members)
- Tofieldia (3 members)
- Toiyabea (1 member)
- Tolmiea (2 members)
- Tolpis (1 member)
- Tolumnia (1 member)
- Tomentypnum (2 members)
- Tonella (2 members)
- Tonestus (4 members)
- Top Level Property (1,391 members)
- Torenia (1 member)
- Torreya (2 members)
- Torreyochloa (3 members)
- Torreyochloa pallida (3 members)
- Tortella (9 members)
- Tortella inclinata (2 members)
- Tortella tortuosa (3 members)
- Tortula (27 members)
- Tortula cuneifolia (1 member)
- Townsendia (27 members)
- Trachelospermum (1 member)
- Trachycystis (1 member)
- Trachypogon (1 member)
- Trachyxiphium (1 member)
- Tracyina (1 member)
- Tradescantia (31 members)
- Tradescantia occidentalis (2 members)
- Tragia (15 members)
- Tragopogon (5 members)
- Tragus (4 members)
- Transberingia (2 members)
- Transberingia bursifolia (2 members)
- Trapa (1 member)
- Trautvetteria (1 member)
- Treatment (23,870 members)
- Trema (2 members)
- Trematodon (6 members)
- Triadenum (4 members)
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- Triantha (4 members)
- Triantha occidentalis (3 members)
- Trianthema (1 member)
- Tribolium (1 member)
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- Trichocoronis wrightii (1 member)
- Trichodon (2 members)
- Trichodon cylindricus (2 members)
- Trichomanes (9 members)
- Trichomanes punctatum (1 member)
- Trichoneura (1 member)
- Trichophorum (6 members)
- Trichoptilium (1 member)
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- Trichostomum (9 members)
- Trichostomum tenuirostre (2 members)
- Tridax (1 member)
- Tridens (12 members)
- Tridens flavus (2 members)
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- Trientalis (3 members)
- Triglochin (4 members)
- Trillium (4 members)
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- Trillium erectum (2 members)
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- Trillium pusillum (2 members)
- Trillium subg. Phyllantherum (24 members)
- Trillium subg. Trillium (18 members)
- Triniteurybia (1 member)
- Triphora (6 members)
- Triphora trianthophoros (1 member)
- Triphysaria (7 members)
- Triphysaria eriantha (2 members)
- Triphysaria versicolor (2 members)
- Triplasis (2 members)
- Tripleurospermum (3 members)
- Tripleurospermum maritimum (2 members)
- Tripogon (1 member)
- Tripsacum (4 members)
- Tripsacum sect. Fasciculata (1 member)
- Tripsacum sect. Tripsacum (2 members)
- Tripterocalyx (4 members)
- Tripterocladium (1 member)
- Triquetrella (1 member)
- Triraphis (1 member)
- Trisetum (10 members)
- Triteleia (15 members)
- Triteleia ixioides (5 members)
- Triteleiopsis (1 member)
- Triticum (12 members)
- Triumfetta (3 members)
- Trixis (3 members)
- Trixis californica (1 member)
- Trollius (3 members)
- Tropaeolaceae (2 members)
- Tropaeolum (1 member)
- Tropidia (1 member)
- Tropidocarpum (3 members)
- Tsuga (4 members)
- Tuberaria (1 member)
- Tuctoria (2 members)
- Tuerckheimia (1 member)
- Tulipa (1 member)
- Tumamoca (1 member)
- Turbina (1 member)
- Turnera (6 members)
- Turnera coerulea (1 member)
- Turnera diffusa (1 member)
- Turnera ulmifolia (1 member)
- Turneraceae (4 members)
- Turritis (1 member)
- Tussilago (1 member)
- Typha (3 members)
- Typhaceae (2 members)
- Ulmaceae (8 members)
- Ulmus (10 members)
- Ulota (10 members)
- Ulota hutchinsiae (2 members)
- Umbellularia (2 members)
- Umbellularia californica (2 members)
- Uniola (1 member)
- Urena (1 member)
- Urochloa (17 members)
- Uropappus (1 member)
- Urospermum (1 member)
- Urtica (5 members)
- Urtica dioica (3 members)
- Urticaceae (16 members)
- Uvularia (5 members)
- Vaccaria (1 member)
- Vaccinium (20 members)
- Vaccinium erythrocarpum (1 member)
- Vaccinium sect. Batodendron (1 member)
- Vaccinium sect. Cyanococcus (9 members)
- Vaccinium sect. Herpothamnus (1 member)
- Vaccinium sect. Myrtillus (7 members)
- Vaccinium sect. Oxycoccoides (2 members)
- Vaccinium sect. Oxycoccus (2 members)
- Vaccinium sect. Polycodium (1 member)
- Vaccinium sect. Pyxothamnus (1 member)
- Vaccinium sect. Vaccinium (1 member)
- Vaccinium sect. Vitis-idaea (1 member)
- Vahlodea (1 member)
- Vallesia (1 member)
- Vallisneria (1 member)
- Vancouveria (3 members)
- Vanilla (5 members)
- Varilla (1 member)
- Vaseyochloa (1 member)
- Vauquelinia (4 members)
- Vauquelinia californica (3 members)
- Vauquelinia corymbosa (1 member)
- Velezia (1 member)
- Venegasia (1 member)
- Ventenata (1 member)
- Venturiella (2 members)
- Venturiella sinensis (1 member)
- Veratrum (8 members)
- Veratrum album (1 member)
- Veratrum californicum (2 members)
- Veratrum viride (2 members)
- Verbascum (17 members)
- Verbascum lychnitis (1 member)
- Verbascum phoeniceum (1 member)
- Verbascum sinuatum (1 member)
- Verbascum speciosum (1 member)
- Verbascum thapsus (1 member)
- Verbesina (16 members)
- Vernicia (1 member)
- Vernonia (17 members)
- Veronica (36 members)
- Veronica beccabunga (1 member)
- Veronica wormskjoldii (2 members)
- Veronicastrum (1 member)
- Vesicularia (1 member)
- Viguiera (3 members)
- Villadia (1 member)
- Vinca (2 members)
- Vincetoxicum (2 members)
- Viola (89 members)
- Viola adunca (2 members)
- Viola biflora (2 members)
- Viola canadensis (3 members)
- Viola epipsila (1 member)
- Viola lobata (2 members)
- Viola palmata (2 members)
- Viola pedata (2 members)
- Viola pinetorum (2 members)
- Viola praemorsa (3 members)
- Viola primulifolia (2 members)
- Viola pubescens (2 members)
- Viola purpurea (7 members)
- Viola sagittata (2 members)
- Viola tricolor (1 member)
- Viola umbraticola (1 member)
- Viola walteri (2 members)
- Violaceae (4 members)
- Viscaceae (6 members)
- Viscum (2 members)
- Viscum album (1 member)
- Vitaceae (12 members)
- Vitis (4 members)
- Vitis cinerea (4 members)
- Vitis rotundifolia (2 members)
- Vitis subg. Muscadinia (2 members)
- Vitis subg. Vitis (19 members)
- Vittaria (3 members)
- Vittariaceae (2 members)
- Voitia (2 members)
- Volutaria (1 member)
- Voyria (1 member)
- Vulpia (8 members)
- Vulpia microstachys (4 members)
- Vulpia octoflora (3 members)
- Waldsteinia (4 members)
- Waltheria (3 members)
- Warea (4 members)
- Warnstorfia (2 members)
- Washingtonia (2 members)
- Watsonia (1 member)
- Websteria (1 member)
- Wedelia (2 members)
- Wedelia acapulcensis (1 member)
- Weissia (10 members)
- Whipplea (1 member)
- Width (70 members)
- Wijkia (1 member)
- Wilhelmsia (1 member)
- Willkommia (1 member)
- Wislizenia (3 members)
- Wissadula (3 members)
- Wolffia (5 members)
- Wolffiella (3 members)
- Woodsia (13 members)
- Woodsia obtusa (2 members)
- Woodsia oregana (2 members)
- Woodsia scopulina (3 members)
- Woodwardia (3 members)
- Wyethia (8 members)
- Xanthisma (8 members)
- Xanthisma grindelioides (2 members)
- Xanthisma sect. Blepharodon (5 members)
- Xanthisma sect. Havardii (1 member)
- Xanthisma sect. Sideranthus (4 members)
- Xanthisma sect. Xanthisma (2 members)
- Xanthisma spinulosum (5 members)
- Xanthisma texanum (3 members)
- Xanthium (2 members)
- Xanthocephalum (1 member)
- Xanthorhiza (1 member)
- Xerochrysum (1 member)
- Xerophyllum (2 members)
- Ximenia (2 members)
- Ximenia americana (1 member)
- Ximeniaceae (2 members)
- Xylococcus (1 member)
- Xylorhiza (10 members)
- Xylorhiza tortifolia (2 members)
- Xylosma (1 member)
- Xyridaceae (2 members)
- Xyris (24 members)
- Xyris difformis (3 members)
- Xyris laxifolia (1 member)
- Xyris stricta (2 members)
- Yermo (1 member)
- Youngia (1 member)
- Yucca (32 members)
- Yucca angustissima (4 members)
- Yucca baccata (2 members)
- Yucca elata (2 members)
- Yucca gloriosa (2 members)
- Zaluzania (1 member)
- Zamia (1 member)
- Zamiaceae (2 members)
- Zannichellia (1 member)
- Zannichelliaceae (2 members)
- Zea (5 members)
- Zea mays (4 members)
- Zelometeorium (1 member)
- Zeltnera (14 members)
- Zenobia (1 member)
- Zephyranthes (16 members)
- Zeuxine (1 member)
- Zigadenus (15 members)
- Zigadenus venenosus (2 members)
- Zingiber (1 member)
- Zingiberaceae (8 members)
- Zinnia (5 members)
- Zizania (6 members)
- Zizania aquatica (2 members)
- Zizania palustris (2 members)
- Zizaniopsis (1 member)
- Ziziphus (6 members)
- Zostera (2 members)
- Zosteraceae (4 members)
- Zoysia (3 members)
- Zuckia (2 members)
- Zuckia brandegeei (3 members)
- Zygodon (6 members)
- Zygodon viridissimus (3 members)
- Zygophyllaceae (12 members)
- Zygophyllum (1 member)
- ×achnella (1 member)
- ×agropogon (1 member)
- ×arctodupontia (1 member)
- ×dupoa (1 member)
- ×elyhordeum (10 members)
- ×elyleymus (11 members)
- ×leydeum (3 members)
- ×pascoleymus (1 member)
- ×pseudelymus (1 member)
- ×pucciphippsia (1 member)