| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ARVI9 | Arabis viridis Harger | Arabis missouriensis | Brassicaceae
|
| ARVI13 | Arabis vivariensis Welsh | Arabis fernaldiana var. fernaldiana | Brassicaceae
|
| ARWH2 | Arabis whitedii Piper | Halimolobos whitedii | Brassicaceae
|
| ARWIS | Arabis williamsii Rollins var. saximontana (Rollins) Rollins | Cross Mountain rockcress | Brassicaceae
|
| ARWIW | Arabis williamsii Rollins var. williamsii | Wind River rockcress | Brassicaceae
|
| ARWI | Arabis williamsii Rollins | Wind River rockcress | Brassicaceae
|
| ARWY | Arabis wyndii Henderson | Arabis rectissima var. rectissima | Brassicaceae
|
| ARABI2 | Arabis L. | rockcress | Brassicaceae
|
| ARGLH4 | Arachis glabrata Benth. var. hagenbeckii (Harms) F.J. Herm. | Arachis hagenbeckii | Fabaceae
|
| ARHA10 | Arachis hagenbeckii Harms | Hagenbeck's peanut | Fabaceae
|
| ARHY | Arachis hypogaea L. | peanut | Fabaceae
|
| ARMO9 | Arachis monticola Krapov. & Rig. | peanut | Fabaceae
|
| ARPR4 | Arachis prostrata Benth. | grassnut | Fabaceae
|
| ARVI16 | Arachis villosulicarpa Hoehne | groundnut | Fabaceae
|
| ARACH | Arachis L. | peanut | Fabaceae
|
| ARCA15 | Arachniodes carvifolia (Kunze) Ching | East Indian hollyfern | Dryopteridaceae
|
| ARCH10 | Arachniodes chaerophylloides (Poir.) Proctor | false hollyfern | Dryopteridaceae
|
| ARIN22 | Arachniodes insularis W.H. Wagner | Santa Cruz Island hollyfern | Dryopteridaceae
|
| ARSI4 | Arachniodes simplicior (Makino) Ohwi | simpler hollyfern | Dryopteridaceae
|
| ARACH2 | Arachniodes Blume | hollyfern | Dryopteridaceae
|
| ARAR19 | Aragallus argophyllus Rydb. | Oxytropis besseyi var. argophylla | Fabaceae
|
| ARAR18 | Aragallus articulatus Greene | Oxytropis lambertii var. articulata | Fabaceae
|
| ARAT4 | Aragallus atropurpureus Rydb. | Oxytropis lagopus var. atropurpurea | Fabaceae
|
| ARBE5 | Aragallus besseyi Rydb. | Oxytropis besseyi var. besseyi | Fabaceae
|
| AROR3 | Aragallus oreophilus (Gray) A. Nels. | Oxytropis oreophila var. oreophila | Fabaceae
|
| ARSP9 | Aragallus splendens (Dougl. ex Hook.) Greene | Oxytropis splendens | Fabaceae
|
| ARVE4 | Aragallus ventosus Greene | Oxytropis besseyi var. ventosa | Fabaceae
|
| ARVID | Aragallus viscidulus Rydb. var. depressus Rydb. | Oxytropis borealis var. viscida | Fabaceae
|
| ARVI11 | Aragallus viscidulus Rydb. | Oxytropis borealis var. viscida | Fabaceae
|
| ARBI6 | Aralia bicrenata Woot. & Standl. | Aralia racemosa ssp. bicrenata | Araliaceae
|
| ARCA2 | Aralia californica S. Wats. | California spikenard | Araliaceae
|
| ARCH12 | Aralia chinensis L. | Chinese angelica tree | Araliaceae
|
| ARCO33 | Aralia cordata Thunb. | udo | Araliaceae
|
| ARED2 | Aralia edulis Siebold & Zucc. | Aralia cordata | Araliaceae
|
| AREL8 | Aralia elata (Miq.) Seem. | Japanese angelica tree | Araliaceae
|
| ARHI2 | Aralia hispida Vent. | bristly sarsaparilla | Araliaceae
|
| ARHU | Aralia humilis Cav. | Arizona spikenard | Araliaceae
|
| ARNU2 | Aralia nudicaulis L. | wild sarsaparilla | Araliaceae
|
| ARPA22 | Aralia papyrifera Hook. | Tetrapanax papyriferus | Araliaceae
|
| ARPE17 | Aralia pentaphylla Sieb. & Zucc. | Eleutherococcus pentaphyllus | Araliaceae
|
| ARRAB2 | Aralia racemosa L. ssp. bicrenata (Woot. & Standl.) Welsh & Atwood | American spikenard | Araliaceae
|
| ARRAR | Aralia racemosa L. ssp. racemosa | American spikenard | Araliaceae
|
| ARRA | Aralia racemosa L. | American spikenard | Araliaceae
|
| ARSP2 | Aralia spinosa L. | devil's walkingstick | Araliaceae
|
| ARALI | Aralia L. | spikenard | Araliaceae
|
| ARFI5 | Aranella fimbriata auct. non (Kunth) Barnh. | Utricularia simulans | Lentibulariaceae
|
| ARAN15 | Araucaria angustifolia (Bertol.) Kuntze | parana pine | Araucariaceae
|
| ARAR23 | Araucaria araucana (Molina) K. Koch | monkeypuzzle tree | Araucariaceae
|
| ARBI12 | Araucaria bidwillii Hook. | bunya bunya | Araucariaceae
|
| ARCO32 | Araucaria columnaris (Forster) Hook. | New Caledonia pine | Araucariaceae
|
| ARCU7 | Araucaria cunninghamii Aiton ex D. Don | Moreton Bay pine | Araucariaceae
|
| AREX4 | Araucaria excelsa (Lamb.) R. Br. | Araucaria columnaris | Araucariaceae
|
| ARHE12 | Araucaria heterophylla (Salisb.) Franco | Norfolk Island pine | Araucariaceae
|
| ARIM4 | Araucaria imbricata Pav. | Araucaria araucana | Araucariaceae
|
| ARAUC2 | Araucaria Juss. | araucaria | Araucariaceae
|
| ARSE8 | Araujia sericifera Brot. | white bladderflower | Asclepiadaceae
|
| ARSE17 | Araujia sericofera Brot. | bladder flower | Asclepiadaceae
|
| ARAUJ | Araujia Brot. | araujia | Asclepiadaceae
|
| ARAL23 | Arbuscula alleghaniensis (C. M�ll.) Crum et al. | Thamnobryum alleghaniense | Thamnobryaceae
|
| ARLE12 | Arbuscula leibergii (Britt.) Crum et al. | Thamnobryum neckeroides | Thamnobryaceae
|
| ARAL12 | Arbutus alpina L. | Arctostaphylos alpina | Ericaceae
|
| ARAR2 | Arbutus arizonica (Gray) Sarg. | Arizona madrone | Ericaceae
|
| ARME | Arbutus menziesii Pursh | Pacific madrone | Ericaceae
|
| ARTE | Arbutus texana Buckl. | Arbutus xalapensis | Ericaceae
|
| ARUN4 | Arbutus unedo L. | strawberry tree | Ericaceae
|
| ARXAT | Arbutus xalapensis Kunth var. texana (Buckl.) Gray | Arbutus xalapensis | Ericaceae
|
| ARXA80 | Arbutus xalapensis Kunth | Texas madrone | Ericaceae
|
| ARBUT | Arbutus L. | madrone | Ericaceae
|
| ARAB4 | Arceuthobium abietinum Engelm. ex Munz | fir dwarf mistletoe | Viscaceae
|
| ARAM | Arceuthobium americanum Nutt. ex Engelm. | American dwarf mistletoe | Viscaceae
|
| ARAP2 | Arceuthobium apachecum Hawksworth & Wiens | Apache dwarf mistletoe | Viscaceae
|
| ARBL3 | Arceuthobium blumeri A. Nels. | southwestern white pine dwarf mistletoe | Viscaceae
|
| ARCA17 | Arceuthobium californicum Hawksworth & Wiens | sugar pine dwarf mistletoe | Viscaceae
|
| ARCA3 | Arceuthobium campylopodum Engelm. | western dwarf mistletoe | Viscaceae
|
| ARCR8 | Arceuthobium cryptopodum Engelm. | Arceuthobium vaginatum ssp. cryptopodum | Viscaceae
|
| ARCY2 | Arceuthobium cyanocarpum (A. Nels. ex Rydb.) A. Nels. | limber pine dwarf mistletoe | Viscaceae
|
| ARDI3 | Arceuthobium divaricatum Engelm. | pinyon dwarf mistletoe | Viscaceae
|
| ARDO | Arceuthobium douglasii Engelm. | Douglas fir dwarf mistletoe | Viscaceae
|
| ARGI2 | Arceuthobium gillii Hawksworth & Wiens | Huachuca Mountain dwarf mistletoe | Viscaceae
|
| ARLA11 | Arceuthobium laricis (Piper) St. John | larch dwarf mistletoe | Viscaceae
|
| ARLI12 | Arceuthobium littorum Hawksworth, Wiens & Nickrent | coastal dwarf mistletoe | Viscaceae
|
| ARMI8 | Arceuthobium microcarpum (Engelm.) Hawksworth & Wiens | western spruce dwarf mistletoe | Viscaceae
|
| ARMO13 | Arceuthobium monticola Hawksworth, Wiens & Nickrent | western white pine dwarf mistletoe | Viscaceae
|
| AROC | Arceuthobium occidentale Engelm. | digger pine dwarf mistletoe | Viscaceae
|
| ARPU3 | Arceuthobium pusillum Peck | eastern dwarf mistletoe | Viscaceae
|
| ARSI10 | Arceuthobium siskiyouense Hawksworth, Wiens & Nickrent | knobcone pine dwarf mistletoe | Viscaceae
|
| ARTSM2 | Arceuthobium tsugense (Rosendahl) G.N. Jones ssp. mertensianae Hawksworth & Nickrent | hemlock dwarf mistletoe | Viscaceae
|
| ARTST2 | Arceuthobium tsugense (Rosendahl) G.N. Jones ssp. tsugense | hemlock dwarf mistletoe | Viscaceae
|
| ARTS | Arceuthobium tsugense (Rosendahl) G.N. Jones | hemlock dwarf mistletoe | Viscaceae
|
| ARVAC | Arceuthobium vaginatum (Willd.) J. Presl ssp. cryptopodum (Engelm.) Hawksworth & Wiens | pineland dwarf mistletoe | Viscaceae
|
| ARVAC2 | Arceuthobium vaginatum (Willd.) J. Presl var. cryptopodum (Engelm.) Cronq. | Arceuthobium vaginatum ssp. cryptopodum | Viscaceae
|
| ARVA | Arceuthobium vaginatum (Willd.) J. Presl | pineland dwarf mistletoe | Viscaceae
|
| ARCEU | Arceuthobium Bieb. | dwarf mistletoe | Viscaceae
|
| ARAL22 | Archidium alternifolium (Hedw.) Schimp. | alternateleaf archidium moss | Archidiaceae
|
| ARDO6 | Archidium donnellii Aust. | Donnell's archidium moss | Archidiaceae
|
| ARFL7 | Archidium floridanum Aust. ex Cain in Grout | Archidium ohioense | Archidiaceae
|
| ARHAM | Archidium hallii Aust. var. minus Ren. & Card. | Archidium minus | Archidiaceae
|
| ARHA9 | Archidium hallii Aust. | Hall's archidium moss | Archidiaceae
|
| ARLO12 | Archidium longifolium Lesq. & James | Archidium alternifolium | Archidiaceae
|
| ARMI12 | Archidium minus (Ren. & Card.) Snider | small archidium moss | Archidiaceae
|
| AROH | Archidium ohioense Schimp. ex C. M�ll. | Ohio archidium moss | Archidiaceae
|