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Alchemilla mollis, Alchemilla monticola, Aletris farinosa, Alisma gramineum, Alisma subcordatum, Alisma triviale, Alliaria petiolata, Allium canadense var. canadense, Allium cernuum, Allium schoenoprasum, Allium stellatum, Allium tricoccum var. burdickii, Allium tricoccum var. tricoccum, Allium vineale, Alnus alnobetula, Alnus alnobetula subsp. crispa, Alnus glutinosa, Alnus incana, Alnus incana subsp. rugosa, Aloina brevirostris, Aloina rigida var. rigida, Alopecurus, Alopecurus aequalis, Alopecurus aequalis var. aequalis, Alopecurus geniculatus, Alopecurus magellanicus, Alopecurus pratensis, Althaea hirsuta, Althaea officinalis, Alyssum alyssoides, Alyssum murale, Amaranthus albus, Amaranthus blitoides, Amaranthus blitum, Amaranthus hybridus, Amaranthus palmeri, Amaranthus powellii, Amaranthus retroflexus, Amaranthus spinosus, Amaranthus tuberculatus, Amblyodon dealbatus, Amblystegium serpens, Ambrosia artemisiifolia, Ambrosia psilostachya, Ambrosia trifida, Amelanchier alnifolia, Amelanchier alnifolia var. alnifolia, Amelanchier amabilis, Amelanchier arborea, Amelanchier bartramiana, Amelanchier humilis, Amelanchier interior, Amelanchier intermedia, Amelanchier laevis, Amelanchier sanguinea, Amelanchier spicata, Amerorchis rotundifolia, Ammannia robusta, Ammophila, Ammophila breviligulata, Ammophila breviligulata subsp. breviligulata, Ammophila breviligulata subsp. champlainensis, Amphidium lapponicum, Amphidium mougeotii, Anacamptodon splachnoides, Anagallis arvensis, Anaphalis margaritacea, Andreaea rothii, Andreaea rupestris, Andromeda polifolia, Andromeda polifolia var. latifolia, Andromeda polifolia var. polifolia, Andropogon, Andropogon gerardii, Andropogon liebmannii, Andropogon sect. Andropogon, Andropogon sect. Leptopogon, Andropogon virginicus, Andropogon virginicus var. glaucus, Andropogon virginicus var. virginicus, Androsace occidentalis, Androsace septentrionalis, Anemone acutiloba, Anemone americana, Anemone canadensis, Anemone cylindrica, Anemone multifida, Anemone multifida var. multifida, Anemone parviflora, Anemone patens, Anemone patens var. multifida, Anemone quinquefolia, Anemone quinquefolia var. quinquefolia, Anemone virginiana, Anemone virginiana var. alba, Anemone virginiana var. cylindroidea, Anemone virginiana var. virginiana, Anoda cristata, Anomodon attenuatus, Anomodon minor, Anomodon rostratus, Anomodon rugelii, Anomodon tristis, Anomodon viticulosus, Antennaria alpina, Antennaria howellii, Antennaria howellii subsp. canadensis, Antennaria howellii subsp. howellii, Antennaria howellii subsp. neodioica, Antennaria howellii subsp. petaloidea, Antennaria microphylla, Antennaria neglecta, Antennaria parlinii, Antennaria parlinii subsp. fallax, Antennaria parlinii subsp. parlinii, Antennaria parvifolia, Antennaria pulcherrima, Antennaria pulcherrima subsp. pulcherrima, Antennaria rosea, Antennaria rosea subsp. confinis, Antennaria rosea subsp. rosea, Anthemis arvensis, Anthemis cotula, Anthoxanthum, Anthoxanthum arcticum, Anthoxanthum hirtum, Anthoxanthum monticola, Anthoxanthum monticola subsp. alpinum, Anthoxanthum monticola subsp. monticola, Anthoxanthum nitens, Anthoxanthum occidentale, Anthoxanthum odoratum, Antirrhinum majus, Apera, Apera interrupta, Apera spica-venti, Aphanorrhegma serratum, Aplectrum hyemale, Aquilegia brevistyla, Aquilegia canadensis, Aquilegia vulgaris, Arabidopsis arenicola, Arabidopsis lyrata, Arabidopsis lyrata subsp. lyrata, Arabidopsis thaliana, Arabis caucasica, Arabis pycnocarpa, Arabis pycnocarpa var. adpressipilis, Arabis pycnocarpa var. pycnocarpa, Arceuthobium americanum, 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, Artemisia annua, Artemisia biennis, Artemisia campestris, Artemisia campestris subsp. canadensis, Artemisia campestris subsp. caudata, Artemisia dracunculus, Artemisia frigida, Artemisia ludoviciana, Artemisia ludoviciana subsp. ludoviciana, Artemisia pontica, Artemisia stelleriana, Artemisia tilesii, Artemisia vulgaris, Aruncus dioicus, Aruncus dioicus var. vulgaris, Asarum canadense, Asimina triloba, Asparagus officinalis, Asplenium platyneuron, Asplenium rhizophyllum, Asplenium ruta-muraria, Asplenium scolopendrium, Asplenium scolopendrium var. americanum, Asplenium trichomanes, Asplenium trichomanes subsp. quadrivalens, Asplenium trichomanes subsp. trichomanes, Asplenium trichomanes-ramosum, Aster alpinus, Aster alpinus subsp. vierhapperi, Athyrium filix-femina, Athyrium filix-femina var. angustum, Athyrium filix-femina var. cyclosorum, Atrichum altecristatum, Atrichum angustatum, Atrichum crispulum, Atrichum crispum, Atrichum tenellum, Atrichum undulatum, Atriplex dioica, Atriplex heterosperma, Atriplex hortensis, Atriplex oblongifolia, Atriplex patula, Atriplex prostrata, Atriplex rosea, Aulacomnium acuminatum, Aulacomnium androgynum, Aulacomnium palustre, Aulacomnium turgidum, Aureolaria flava