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Arceuthobium pusillum, Arctagrostis, Arctagrostis latifolia, Arctagrostis latifolia subsp. arundinacea, Arctagrostis latifolia subsp. latifolia, Arctanthemum arcticum, Arctanthemum arcticum subsp. polare, Arctium lappa, Arctium minus, Arctium tomentosum, Arctophila, Arctophila fulva, Arctostaphylos uva-ursi, Arctous alpina, Arctous rubra, Arenaria humifusa, Arenaria serpyllifolia, Arenaria serpyllifolia var. serpyllifolia, Arethusa bulbosa, Argemone mexicana, Arisaema dracontium, Arisaema triphyllum, Aristida, Aristida basiramea, Aristida dichotoma, Aristida dichotoma var. dichotoma, Aristida longespica, Aristida longespica var. geniculata, Aristida longespica var. longespica, Aristida oligantha, Aristida purpurascens, Aristida purpurascens var. purpurascens, Aristolochia clematitis, Aristolochia macrophylla, Armeria maritima, Armeria maritima subsp. sibirica, Armoracia rusticana, Arnica angustifolia, Arnica angustifolia subsp. angustifolia, Arnica chamissonis, Arnica cordifolia, Arnica lonchophylla, Arnoglossum plantagineum, Aronia arbutifolia, Aronia melanocarpa, Arrhenatherum, Arrhenatherum elatius, Arrhenopterum heterostichum, Artemisia abrotanum, Artemisia absinthium