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Abronia bolackii, Abronia umbellata var. breviflora, Acanthoscyphus parishii var. abramsii, Acanthoscyphus parishii var. cienegensis, Acanthoscyphus parishii var. goodmaniana, Acleisanthes angustifolia, Acleisanthes chenopodioides, Acleisanthes diffusa, Acleisanthes lanceolata, Acleisanthes lanceolata var. lanceolata, Acleisanthes nevadensis, Acleisanthes parvifolia, Aconitum columbianum subsp. viviparum, Aconogonon alaskanum var. glabrescens, Aconogonon davisiae var. glabrum, Aconogonon phytolaccifolium var. glabrum, Adiantum aleuticum, Adiantum viridimontanum, Agalinis flexicaulis, Agalinis navasotensis, Agave delamateri, Agave deserti var. simplex, Agave parryi subsp. neomexicana, Agave phillipsiana, Agave ×ajoensis, Agnorhiza, Agnorhiza bolanderi, Agnorhiza elata, Agnorhiza invenusta, Agnorhiza ovata, Agnorhiza reticulata, Agoseris apargioides var. maritima, Agoseris grandiflora var. leptophylla, Agoseris heterophylla var. quentinii, Allium abramsii, Allium atrorubens var. cristatum, Allium bolanderi var. mirabile, Allium denticulatum, Allium diabolense, Allium fimbriatum var. purdyi, Allium munzii, Allium peninsulare var. franciscanum, Allium sharsmithiae, Alnus alnobetula subsp. crispa, Alnus alnobetula subsp. fruticosa, Alnus alnobetula subsp. sinuata, Amaranthus sect. Acanthochiton, Amaranthus sect. Acnida, Amaranthus sect. Saueranthus, Amaranthus tamaulipensis, Ambrosia monogyra, Ambrosia salsola, Ammannia grayi, Ampelaster, Ampelaster carolinianus, Ancistrocarphus keilii, Anemone multifida var. stylosa, Anemone narcissiflora var. zephyra, Anemone okennonii, Anemone quinquefolia var. minima, Anisocarpus scabridus, Antennaria friesiana subsp. neoalaskana, Antennaria luzuloides subsp. aberrans, Antennaria pulcherrima subsp. eucosma, Anulocaulis leiosolenus var. gypsogenus, Anulocaulis leiosolenus var. howardii, Arabidopsis arenicola, Arabidopsis lyrata, Arabidopsis lyrata subsp. kamchatica, Arabidopsis lyrata subsp. lyrata, Arabidopsis lyrata subsp. petraea, Arceuthobium campylopodum subsp. abietinum, Arceuthobium campylopodum subsp. apachecum, Arceuthobium campylopodum subsp. blumeri, Arceuthobium campylopodum subsp. californicum, Arceuthobium campylopodum subsp. cyanocarpum, Arceuthobium campylopodum subsp. laricis, Arceuthobium campylopodum subsp. littorum, Arceuthobium campylopodum subsp. microcarpum, Arceuthobium campylopodum subsp. monticola, Arceuthobium campylopodum subsp. occidentale, Arceuthobium campylopodum subsp. siskiyouense, Arceuthobium campylopodum subsp. tsugense, Arenaria lanuginosa var. saxosa, Argyrochosma limitanea subsp. mexicana, Arida, Arida arizonica, Arida blepharophylla, Arida carnosa, Arida mattturneri, Arida parviflora, Arida riparia, Arnica dealbata, Arnica lanceolata subsp. prima, Arnoglossum album, Artemisia arbuscula subsp. longiloba, Artemisia globularia subsp. lutea, Asplenium scolopendrium var. americanum, Astranthium ciliatum, Astrolepis