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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, Astrolepis cochisensis, Astrolepis cochisensis subsp. arizonica, Astrolepis cochisensis subsp. chihuahuensis, Astrolepis cochisensis subsp. cochisensis, Astrolepis integerrima, Astrolepis sinuata, Astrolepis sinuata subsp. mexicana, Astrolepis sinuata subsp. sinuata, Astrolepis windhamii, Atriplex acanthocarpa var. coahuilensis, Atriplex argentea var. longitrichoma, Atriplex argentea var. rydbergii, Atriplex cordulata var. erecticaulis, Atriplex coronata var. vallicola, Atriplex gardneri var. aptera, Atriplex garrettii var. navajoensis, Atriplex glabriuscula var. acadiensis, Atriplex glabriuscula var. franktonii, Atriplex gmelinii var. alaskensis, Atriplex parishii var. depressa, Atriplex parishii var. minuscula, Atriplex parishii var. persistens, Atriplex parishii var. subtilis, Atriplex powellii var. minuticarpa, Atriplex saccaria var. asterocarpa, Atriplex saccaria var. cornuta, Atriplex sect. Covilleiae, Atriplex sect. Phyllostegiae, Atriplex sect. Pleianthae, Atriplex subg. Obione, Atriplex subg. Pterochiton, Atriplex subsect. Arenariae, Atriplex subsect. Argenteae, Atriplex subsect. Californicae, Atriplex subsect. Graciliflorae, Atriplex subsect. Leucophyllae, Atriplex subsect. Pusillae, Atriplex subsect. Saccariae, Atriplex subsect. Truncatae, Atriplex subsect. Wolfianae, Atriplex wolfii var. tenuissima, Baccharis malibuensis, Bahiopsis laciniata, Bahiopsis parishii, Bahiopsis reticulata, Balsamorhiza lanata, Berlandiera monocephala, Boechera acutina, Boechera arcuata, Boechera atrorubens