Data have been entered for 6303 species.
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Abelia chinensis bush arbutus
Abelia Xgrandiflora smooth abelia
Abeliophyllum distichum pink forsythia
Abies alba European silver fir
Abies amabilis Pacific silver fir
Abies balsamea balsam fir
Abies bracteata Santa Lucia fir
Abies cilicica Cilician fir
Abies concolor white fir
Abies fraseri Fraser fir
Abies grandis lowland white fir
Abies homolepis Nikko fir
Abies koreana Korean fir
Abies lasiocarpa Rocky Mountain fir
Abies magnifica California red fir
Abies nordmanniana Caucasian fir
Abies pinsapo Spanish fir
Abies procera noble fir
Abies veitchii Veitch's silver fir
Abronia latifolia
Abronia umbellata var. breviflora beach sand verbena
Abutilon theophrasti velvetleaf
Acacia farnesiana sweet acacia
Acaena microphylla scarlet bidi-bidi
Acalypha virginica Virginia threeseed mercury
Acalypha wilkesiana beafsteak plant
Acanthomintha ilicifolia
Acanthus balcanicus Hungarian bear's-breeches
Acanthus mollis oakleaf bear's-breeches
Acanthus spinosus spiny bear's-breeches
Acer barbatum hammock maple
Acer barbinerve bearded maple
Acer buergeranum trident maple
Acer campestre field maple
Acer capillipes snakebark maple
Acer cappadocicum Balkans maple
Acer carpinifolium hornbeamleaf maple
Acer circinatum western mountain maple
Acer cissifolium ivyleaf maple
Acer davidii Father David's maple
Acer diabolicum devil maple
Acer glabrum Rocky Mountain maple
Acer glabrum var. glabrum Rocky Mountain maple
Acer grandidentatum canyon maple (var. sinuosum)
Acer griseum paperbark maple
Acer japonicum fullmoon maple
Acer macrophyllum Oregon maple
Acer mandshuricum Manchurian maple
Acer maximowiczianum Nikko maple
Acer micranthum garden maple
Acer miyabei Miyabe maple
Acer monspessulanum Montpellier maple
Acer negundo boxelder
Acer negundo var. negundo boxelder
Acer oliverianum Oliver maple
Acer palmatum cutleaf Japanese maple (var. dissectum)
Acer pensylvanicum striped maple
Acer platanoides Schwedler maple
Acer pseudoplatanus sycamore maple
Acer psuedosieboldianum purplebloom maple
Acer rubrum red maple
Acer rufinerve redvein maple
Acer saccharinum silver maple
Acer saccharum sugar maple
Acer saccharum subsp. leucoderme chalk maple
Acer saccharum subsp. nigrum black maple
Acer saccharum subsp. saccharum
Acer sieboldianum Siebold's maple
Acer spicatum mountain maple
Acer tataricum Tatarian maple
Acer tataricum subsp. ginnala ginnala maple
Acer tataricum subsp. semenovii Semenov's Amur maple
Acer tegmentosum Manchurian stripebark maple
Acer triflorum roughbark maple
Acer truncatum Shantung maple
Acer Xfreemanii Freeman's maple
Achillea alpina Siberian yarrow
Achillea filipendulina fernleaf yarrow
Achillea lanulosa var. lanulosa woolly yarrow
Achillea millefolium common yarrow
Achillea ptarmica sneezeweed yarrow
Achillea tomentosa yellow milfoil
Achillea X'Moonshine' moonshine yarrow
Achillea Xlewisii dwarf woolly yarrow
Achlys triphylla sweet-after-death
Achnatherum calamagrostis spear grass
Achnatherum hymenoides Indian ricegrass
Achnatherum richardsonii Richardson's needlegrass
Aconitum carmichaelii azure monkshood
Aconitum columbianum subsp. columbianum northern monkshood
Aconitum henryi Henry's monkshood
Aconitum lamarckii yellow wolfsbane
Aconitum napellus Venus' chariot
Aconitum reclinatum
Aconitum Xcammarum bicolor monkshood
Acorus americanus American sweetflag
Acorus calamus European sweetflag
Acorus gramineus grassleaf sweetflag
Actaea elata
Actaea pachypoda doll's-eyes
Actaea podocarpa
Actaea rubifolia
Actaea rubra red baneberry
Actinidia arguta bower actinidia
Actinidia chinensis Chinese gooseberry
Actinidia kolomikta hardy kiwi
Actinidia polygama silver vine
Adenocaulon bicolor pathfinder
Adenophora liliifolia ladybells
Adiantum aleuticum Aleutian maidenhair fern
Adiantum capillus-veneris southern maidenhair
Adiantum pedatum northern maidenhair
Adiantum tenerum brittle maidenhair
Adiantum viridimontanum Green Mountain maidenhair fern
Adlumia fungosa Allegheny vine
Adolphia californica
Adonis vernalis sweet vernal
Adoxa moschatellina muskroot
Aegopodium podagraria goat's-foot
Aeschynomene virginica
Aesculus californica California horsechestnut
Aesculus flava yellow buckeye
Aesculus glabra fetid buckeye
Aesculus glabra var. arguta Texas buckeye
Aesculus glabra var. glabra fetid buckeye
Aesculus hippocastanum common horsechestnut
Aesculus parviflora dwarf horsechestnut
Aesculus pavia scarlet buckeye
Aesculus sylvatica painted buckeye
Aesculus turbinata Japanese buckeye
Aesculus Xcarnea flowering horse chestnut
Aesculus Xhybrida hybrid buckeye
Agalinis acuta sandplain agalinis
Agalinis aphylla
Agalinis auriculata
Agalinis filicaulis
Agalinis gattingeri roundstem false foxglove
Agalinis maritima
Agalinis neoscotica
Agalinis paupercula smallflower gerardia
Agalinis paupercula var. borealis smallflower gerardia
Agalinis purpurea purple false foxglove
Agalinis skinneriana Skinner's agalinis
Agalinis tenuifolia slenderleaf false foxglove
Agalinis tenuifolia var. parviflora slenderleaf false foxglove
Agapanthus Headborne Hybrids lily-of-the-Nile
Agastache Fortune hybrids hybrid anise-hyssop
Agastache Western Hybrids hybrid anise-hyssop
Agastache cana grayish-white giant hyssop
Agastache foeniculum blue giant hyssop
Agastache nepetoides
Agastache rupestris rock anise-hyssop
Agastache scrophulariifolia
Ageratina altissima white snakeroot
Ageratina altissima var. altissima white snakeroot
Ageratina luciae-brauniae Braun's thoroughwort
Agoseris aurantiaca orange agoseris
Agoseris aurantiaca var. aurantiaca orange agoseris
Agoseris glauca pale agoseris
Agrimonia gryposepala tall hairy agrimony
Agrimonia incisa
Agrimonia parviflora swamp agrimony
Agrimonia pubescens soft agrimony
Agrimonia rostellata
Agrimonia striata woodland agrimony
Agropyron cristatum crested wheatgrass
Agrostemma githago common corncockle
Agrostis capillaris colonial bentgrass
Agrostis clavata clubbed bentgrass
Agrostis exarata spike bentgrass
Agrostis gigantea redtop
Agrostis hyemalis winter bentgrass
Agrostis mertensii northern bentgrass
Agrostis oregonensis Oregon bentgrass
Agrostis perennans upland bentgrass
Agrostis scabra tickle grass
Agrostis stolonifera creeping bentgrass
Agrostis variabilis mountain bentgrass
Ailanthus altissima tree-of-heaven
Ajania pacifica Pacific chrysanthemum
Ajuga genevensis Geneva bugleweed
Ajuga reptans common bugle
Ajuga Xtenorei carpet bugleweed
Akebia quinata fiveleaf akebia
Akebia trifoliata three-leaflet akebia
Albizia julibrissin mimosa tree
Alcea ficifolia
Alcea rosea garden hollyhock
Alchemilla alpina alpine lady’s mantle
Alchemilla erythropoda redstem lady’s mantle
Alchemilla faeroensis dwarf lady's mantle
Alchemilla filicaulis thinstem lady's mantle
Alchemilla filicaulis subsp. filicaulis thinstem lady's mantle
Alchemilla mollis giant lady’s mantle
Alchemilla monticola mountain lady's mantle
Aletris farinosa white colicroot
Alisma gramineum grassleaf waterplantain
Alisma plantago-aquatica European waterplantain
Alisma subcordatum southern waterplantain
Alisma triviale northern waterplantain
Alliaria petiolata hedge garlic
Allium aaseae South Idaho onion
Allium acuminatum Hooker's onion
Allium aflatunense Persian onion
Allium atropurpureum purple onion
Allium bolanderi Bolander's onion
Allium bolanderi var. mirabile Bolander's onion
Allium caeruleum blue allium
Allium campanulatum
Allium canadense Canada garlic
Allium canadense var. canadense Canada garlic
Allium cernuum nodding onion
Allium cristophii star-of-Persia
Allium cyaneum blue onion
Allium flavum yellow onion
Allium geyeri var. geyeri Geyer's onion
Allium giganteum giant onion
Allium karataviense Turkestan onion
Allium madidum swamp onion
Allium moly yellow onion
Allium narcissiflorum narcissus onion
Allium neopolitanum daffodil garlic
Allium oreophilum alpine rosy bells
Allium porrum garden leek
Allium rosenbachianum Rosenbach's onion
Allium schoenoprasum wild chives
Allium schoenoprasum var. schoenoprasum wild chives
Allium schoenoprasum var. sibiricum wild chives
Allium schubertii Schubert's garlic
Allium senescens broadleaf chives
Allium siculum ornamental onion
Allium sphaerocephalum drumstick onion
Allium stellatum autumn onion
Allium textile prairie onion
Allium thunbergii Japanese onion
Allium tricoccum wild leek
Allium tricoccum var. burdickii narrowleaf wild leek
Allium tuberosum garlic chives
Allium unifolium oneleaf onion
Allium validum swamp onion
Allium X'Globemaster' Globemaster onion
Allotropa virgata candystick
Almutaster pauciflorus marsh alkali aster
Alnus glutinosa European black alder
Alnus incana speckled alder (subsp. rugosa)
Alnus incana subsp. rugosa speckled alder
Alnus incana subsp. tenuifolia western mountain alder
Alnus maritima seaside alder
Alnus rhombifolia white alder
Alnus rubra Oregon alder
Alnus serrulata smooth alder
Alnus viridis green alder
Alnus viridis subsp. crispa mountain alder
Alnus viridis subsp. sinuata Sitka alder
Alopecurus aequalis shortawn foxtail
Alopecurus aequalis var. aequalis shortawn foxtail
Alopecurus carolinianus tufted foxtail
Alopecurus geniculatus water foxtail
Alopecurus magellanicus alpine foxtail
Alopecurus pratensis field foxtail
Alstroemeria Ligtu hybrids Peruvian lily
Alstroemeria aurea lily-of-the-Incas
Althaea officinalis marsh mallow
Alyssum alyssoides small alyssum
Alyssum montanum mountain alyssum
Alyssum wulfenianum alpine alyssum
Amaranthus albus tumbleweed amaranth
Amaranthus blitoides matweed
Amaranthus californicus California amaranth
Amaranthus caudatus love-lies-bleeding
Amaranthus cruentus blood amaranth
Amaranthus hybridus smooth amaranth
Amaranthus powellii Powell's smooth amaranth
Amaranthus pumilus seabeach amaranth
Amaranthus retroflexus redroot amaranth
Amaranthus tuberculatus roughfruit amaranth
Ambrosia acanthicarpa burr ragweed
Ambrosia artemisiifolia common ragweed
Ambrosia linearis Colorado bursage
Ambrosia psilostachya perennial ragweed
Ambrosia trifida giant ragweed
Amelanchier alnifolia saskatoonberry
Amelanchier alnifolia var. alnifolia saskatoonberry
Amelanchier arborea downy shadbush
Amelanchier bartramiana mountain shadbush
Amelanchier canadensis eastern shadbush
Amelanchier canadensis var. obovalis coastal plain serviceberry
Amelanchier cusickii Cusick's shadbush
Amelanchier gaspensis Gaspé shadbush
Amelanchier humilis low shadbush
Amelanchier interior Wiegand's shadbush
Amelanchier intermedia intermediate shadbush
Amelanchier laevis smooth shadbush
Amelanchier nantucketensis Nantucket shadbush
Amelanchier sanguinea redtwig shadbush
Amelanchier spicata thicket shadbush
Amelanchier Xgrandiflora apple serviceberry
Amelanchier Xneglecta hybrid Juneberry
Amianthium muscitoxicum
Ammannia coccinea
Ammannia robusta
Ammophila breviligulata American beachgrass
Amorpha canescens leadplant
Amorpha fruticosa indigobush amorpha
Amorpha nana dwarf false indigo
Amorpha ouachitensis
Amorpha schwerinii
Ampelopsis arborea pepper vine
Ampelopsis brevipedunculata porcelain berry
Ampelopsis humulifolia hops amelopsis
Amphicarpaea bracteata hog peanut
Amphiscirpus nevadensis Nevada clubrush
Amsinckia lunaris
Amsinckia menziesii Menzies' fiddleneck
Amsonia hubrichtii Arkansas amsonia
Amsonia ludoviciana Louisiana bluestar
Amsonia tabernaemontana eastern bluestar
Anacyclus depressus Mount Atlas daisy
Anagallis arvensis scarlet pimpernel
Anagallis minima
Anaphalis margaritacea pearly everlasting
Anaphalis triplinervis threevein everlasting
Anchusa arvensis small bugloss
Anchusa azurea Italian alkanet
Ancistrocactus brevihamatus shortspine fishhook cactus
Andrachne colchica Caucasian spurge
Andromeda polifolia bog rosemary
Andromeda polifolia var. latifolia glaucous-leaf bog rosemary
Andropogon arctatus pinewoods bluestem
Andropogon gerardii big bluestem
Andropogon glomeratus bushy bluestem
Andropogon hallii sand bluestem
Andropogon virginicus broomsedge bluestem
Androsace chamaejasme subsp. lehmanniana
Androsace filiformis
Androsace occidentalis
Androsace septentrionalis northern fairy candelabra
Anemone acutiloba sharplobe liverleaf
Anemone americana American liverleaf
Anemone blanda blue wood anemone
Anemone canadensis roundleaf thimbleweed
Anemone coronaria crown anemone
Anemone cylindrica longhead anemone
Anemone drummondii var. lithophila Little Belt Mountain thimbleweed
Anemone hepatica European liverleaf
Anemone hupehensis Japanese anemone
Anemone lyallii Lyall's anemone
Anemone multiceps Porcupine River thimbleweed
Anemone multifida cliff anemone
Anemone multifida var. multifida cutleaf anemone
Anemone nemorosa European thimbleweed
Anemone parviflora northern anemone
Anemone patens pasqueflower
Anemone patens var. multifida prairie smoke
Anemone pulsatilla European pasqueflower
Anemone quinquefolia nightcaps
Anemone quinquefolia var. quinquefolia nightcaps
Anemone richardsonii Richardson's anemone
Anemone sylvestris snowdrop windflower
Anemone tomentosa grapeleaf anemone
Anemone virginiana tall thimbleweed
Anemone virginiana var. alba riverbank anemone
Anemone virginiana var. cylindroidea tall anemone
Anemone virginiana var. virginiana thimbleweed
Anemone Xhybrida Japanese anemone
Anemone Xlesseri rose windflower
Anethum graveolens dill
Angelica archangelica garden angelica
Angelica atropurpurea wild masterwort
Angelica gigas red angelica
Angelica lucida sea-watch
Angelica pinnata
Angelica venenosa hairy angelica
Antennaria aromatica scented pussytoes
Antennaria corymbosa flattop pussytoes
Antennaria densifolia denseleaf pussytoes
Antennaria dimorpha low pussytoes
Antennaria dioica stoloniferous pussytoes
Antennaria flagellaris whip pussytoes
Antennaria friesiana subsp. alaskana Alaska pussytoes
Antennaria howellii Howell's pussytoes
Antennaria howellii subsp. canadensis Canada pussytoes
Antennaria howellii subsp. neodioica northern pussytoes
Antennaria howellii subsp. petaloidea petaloid pussytoes
Antennaria lanata woolly pussytoes
Antennaria monocephala subsp. angustata narrowleaf pygmy pussytoes
Antennaria neglecta field pussytoes
Antennaria parlinii Parlin's pussytoes
Antennaria parlinii subsp. fallax deceitful pussytoes
Antennaria parlinii subsp. parlinii Parlin's pussytoes
Antennaria parvifolia small-leaf pussytoes
Antennaria pulcherrima showy pussytoes
Antennaria rosea rosy pussytoes
Antennaria solitaria singlehead pussytoes
Antennaria virginica shale-barren pussytoes
Anthemis arvensis corn chamomile
Anthemis cotula stinking chamomile
Anthemis cretica subsp. carpatica white marguerite
Anthericum liliago St. Bernard's lily
Anthericum ramosum branched St. Bernard's lily
Anthoxanthum monticola subsp. alpinum alpine sweetgrass
Anthoxanthum nitens subsp. nitens sweetgrass
Anthoxanthum odoratum sweet vernalgrass
Anthriscus sylvestris cow parsley
Anthyllis vulneraria lady's fingers
Anticlea elegans death camas
Antirrhinum braun-blanquetii yellow snapdragon
Antirrhinum majus common snapdragon
Apera interrupta dense silky bentgrass
Aphragmus eschscholtzianus Eschscholtz's little nightmare
Apios americana groundnut
Apios priceana
Aplectrum hyemale puttyroot
Apocynum androsaemifolium creeping dogbane
Apocynum cannabinum hemp dogbane
Apocynum Xfloribundum intermediate dogbane
Aquilegia alpina alpine columbine
Aquilegia brevistyla shortstyle columbine
Aquilegia canadensis wild red columbine
Aquilegia chrysantha golden columbine
Aquilegia ecalcarata semiaquilegia
Aquilegia flabellata fan columbine
Aquilegia formosa western columbine
Aquilegia formosa var. formosa Sitka columbine
Aquilegia jonesii blue limestone columbine
Aquilegia vulgaris culverwort
Aquilegia Xcultorum hybrid columbine
Arabidopsis arenicola arctic rockcress
Arabidopsis lyrata lyreleaf rockcress
Arabidopsis lyrata subsp. kamchatica Kamchatka rockcress
Arabidopsis lyrata subsp. lyrata lyreleaf rockcress
Arabidopsis thaliana mouseear cress
Arabis alpina alpine rockcress
Arabis blepharophylla rose rockcress
Arabis caucasica wall rockcress
Arabis ferdinandi-coburgi Ferdinand's wallcress
Arabis hirsuta hairy rockcress
Arabis patens
Arabis pycnocarpa western hairy rockcress
Arabis pycnocarpa var. adpressipilis creamflower rockcress
Arabis pycnocarpa var. pycnocarpa western hairy rockcress
Arabis Xsturii mountain rockcress
Aralia cordata udo
Aralia elata Chinese angelica-tree
Aralia hispida bristly spikenard
Aralia nudicaulis small spikenard
Aralia racemosa spikenard
Aralia racemosa subsp. racemosa spikenard
Aralia spinosa devil's walkingstick
Araucaria araucana Brazilian pine (hort.)
Arbutus menziesii Pacific arbutus
Arbutus unedo strawberry tree
Arbutus Xandrachnoides hybrid strawberry tree
Arceuthobium americanum pine mistletoe
Arceuthobium pusillum eastern dwarf mistletoe
Arceuthobium pusillum eastern dwarf mistletoe
Arctagrostis latifolia polargrass
Arctanthemum arcticum arctic daisy
Arctanthemum arcticum subsp. polare polar daisy
Arctium lappa great burdock
Arctium minus common burdock
Arctium tomentosum woolly burdock
Arctomecon californica
Arctomecon merriamii
Arctostaphylos andersonii Santa Cruz manzanita
Arctostaphylos catalinae Santa Catalina Island manzanita
Arctostaphylos columbiana bristly bearberry
Arctostaphylos gabilanensis Gabilan manzanita
Arctostaphylos luciana Santa Lucia manzanita
Arctostaphylos regismontana Kings Mountain manzanita
Arctostaphylos uva-ursi common bearberry
Arctous alpina alpine bearberry
Arctous rubra red bearberry
Arenaria humifusa low sandwort
Arenaria longipedunculata long-stemmed sandwort
Arenaria montana mountain sandwort
Arenaria serpyllifolia thymeleaf sandwort
Arethusa bulbosa swamp pink
Argentina anserina silverweed
Argentina egedii Egede's silverweed
Argentina egedii subsp. egedii Egede's silverweed
Argyrocytisus battandieri pineapple broom
Arisaema consanguineum Himalayan cobra lily
Arisaema dracontium green dragon
Arisaema sikokianum gaudy Jack
Arisaema triphyllum Jack-in-the-pulpit
Arisaema triphyllum subsp. stewardsonii Stewardson Brown's Jack-in-the-pulpit
Arisaema triphyllum subsp. triphyllum Jack-in-the-pulpit
Aristida basiramea forked threeawn grass
Aristida dichotoma churchmouse threeawn grass
Aristida dichotoma var. dichotoma churchmouse threeawn grass
Aristida longespica slimspike threeawn grass
Aristida longespica var. geniculata Kearney's threeawn grass
Aristida longespica var. longespica slimspike threeawn grass
Aristida oligantha oldfield threeawn grass
Aristida purpurascens arrowfeather threeawn grass
Aristida purpurascens var. purpurascens arrowfeather threeawn grass
Aristida purpurea var. longiseta red threeawn grass
Aristida tuberculosa seaside threeawn grass
Aristolochia macrophylla Dutchman's pipe
Aristolochia serpentaria Virginia snakeroot
Aristolochia tomentosa woolly Dutchman's pipe
Armeria caespitosa Spanish thrift
Armeria maritima foxflower
Armeria maritima subsp. sibirica foxflower
Armoracia rusticana red cole
Arnica angustifolia narrowleaf arnica
Arnica angustifolia subsp. angustifolia narrowleaf arnica
Arnica angustifolia subsp. tomentosa woolly arnica
Arnica chamissonis Chamisso's arnica
Arnica cordifolia heartleaf arnica
Arnica fulgens hillside arnica
Arnica lanceolata lanceleaf arnica
Arnica lanceolata subsp. lanceolata lanceleaf arnica
Arnica lessingii Lessing's arnica
Arnica lonchophylla northern arnica
Arnica mollis hairy arnica
Arnica ovata sticky arnica
Arnica rydbergii Rydberg's arnica
Arnoglossum plantagineum tuberous Indian-plantain
Arnoglossum reniforme great Indian plantain
Aronia arbutifolia red chokeberry
Aronia melanocarpa black chokeberry
Aronia Xprunifolia purple chokeberry
Arrhenatherum elatius tall oatgrass
Arrhenatherum elatius subsp. bulbosum tuber oatgrass
Artemisia abrotanum southern wormwood
Artemisia absinthium common wormwood
Artemisia annua annual wormwood
Artemisia biennis biennial wormwood
Artemisia borealis subsp. borealis boreal wormwood
Artemisia campestris field wormwood
Artemisia campestris subsp. caudata tall wormwood
Artemisia campestris subsp. scouleriana Pacific wormwood
Artemisia cana silver wormwood
Artemisia dracunculus dragon wormwood
Artemisia frigida prairie sagebrush
Artemisia globularia purple wormwood
Artemisia laciniata Siberian wormwood
Artemisia laciniata subsp. laciniata cutleaf wormwood
Artemisia lactiflora white mugwort
Artemisia ludoviciana silver wormwood
Artemisia ludoviciana subsp. albula white wormwood
Artemisia pontica Roman wormwood
Artemisia schmidtiana silver mound artemisia
Artemisia stelleriana beach wormwood
Artemisia tilesii Tilesius wormwood
Artemisia tridentata big sagebrush
Artemisia vulgaris common wormwood
Arum italicum Italian arum
Aruncus aethusifolius Korean goatsbeard
Aruncus dioicus goatsbeard
Arundinaria viridistriata dwarf goldenstripe bamboo
Arundo donax giant reed
Asarina procumbens trailing snapdragon
Asarum canadense wild ginger
Asarum caudatum western wild ginger
Asarum europaeum European wild ginger
Asarum splendens Chinese wild ginger
Asarum wagneri greenflower wild ginger
Asclepias amplexicaulis clasping milkweed
Asclepias exaltata poke milkweed
Asclepias hirtella prairie milkweed
Asclepias incarnata swamp milkweed
Asclepias incarnata subsp. incarnata red milkweed
Asclepias lanuginosa sidecluster milkweed
Asclepias meadii Mead's milkweed
Asclepias ovalifolia ovalleaf milkweed
Asclepias pedicellata savannah milkweed
Asclepias purpurascens purple milkweed
Asclepias quadrifolia whorled milkweed
Asclepias rubra red milkweed
Asclepias speciosa showy milkweed
Asclepias sullivantii prairie milkweed
Asclepias syriaca common milkweed
Asclepias tuberosa pleurisy root
Asclepias variegata redring milkweed
Asclepias verticillata whorled milkweed
Asclepias viridiflora green milkweed
Asclepias viridis green antlopehorn
Asclepias viridula southern milkweed
Asimina parviflora dwarf pawpaw
Asimina triloba pawpaw
Askellia elegans elegant hawksbeard
Askellia nana dwarf hawksbeard
Asparagus officinalis garden asparagus
Asphodeline lutea King's spear
Aspidistra elatior cast-iron plant
Aspidotis densa Indian's dream
Asplenium bradleyi Bradley's spleenwort
Asplenium pinnatifidum
Asplenium platyneuron ebony spleenwort
Asplenium rhizophyllum walking fern
Asplenium ruta-muraria wallrue spleenwort
Asplenium scolopendrium hart's-tongue fern
Asplenium scolopendrium var. americanum American hart's-tongue fern
Asplenium septentrionale forked spleenwort
Asplenium trichomanes maidenhair spleenwort
Asplenium trichomanes subsp. quadrivalens limestone maidenhair spleenwort
Asplenium trichomanes subsp. trichomanes maidenhair spleenwort
Asplenium viride green spleenwort
Aster alpinus alpine aster
Aster alpinus subsp. vierhapperi Vierhapper's aster
Aster amellus Italian aster
Aster tataricus Tartarian aster
Aster tongolensis Wartburg aster
Aster Xfrikartii Frikart's aster
Astilbe chinensis dwarf Chinese astilbe
Astilbe japonica florist's spiraea
Astilbe simplicifolia dwarf astilbe
Astilbe Xarendsii false spiraea
Astilbe Xrosea feather flower
Astilboides tabularis shieldleaf rodgersia
Astragalus adsurgens
Astragalus agrestis cock's-head
Astragalus alpinus alpine milkvetch
Astragalus alpinus var. alpinus alpine milkvetch
Astragalus alpinus var. brunetianus
Astragalus amblytropis
Astragalus americanus American milkvetch
Astragalus atratus var. inseptus
Astragalus australis southern milkvetch
Astragalus barrii
Astragalus bodinii
Astragalus bourgovii
Astragalus canadensis Carolina milkvetch
Astragalus canadensis var. canadensis Canada milkvetch
Astragalus convallarius
Astragalus crassicarpus buffalo bean
Astragalus cusickii var. sterilis
Astragalus drummondii
Astragalus eucosmus elegant milkvetch
Astragalus filipes
Astragalus flexuosus
Astragalus gilviflorus
Astragalus gilviflorus var. gilviflorus
Astragalus gracilis
Astragalus laxmannii var. robustior prairie milkvetch
Astragalus lentiginosus var. salinus
Astragalus lotiflorus
Astragalus michauxii
Astragalus microcystis
Astragalus miser
Astragalus missouriensis
Astragalus musiniensis
Astragalus neglectus Cooper's milkvetch
Astragalus nutzotinensis
Astragalus paysonii
Astragalus pectinatus
Astragalus racemosus
Astragalus racemosus var. racemosus
Astragalus ripleyi
Astragalus robbinsii var. minor
Astragalus solitarius
Astragalus spatulatus
Astragalus tenellus loose-flower milkvetch
Astragalus tener var. tener
Astragalus tennesseensis
Astragalus tiehmii
Astragalus umbraticus
Astragalus vexilliflexus
Astragalus vexilliflexus var. vexilliflexus
Astrantia carniolica dwarf masterwort
Astrantia major great masterwort
Athyrium alpestre subsp. americanum American alpine lady fern
Athyrium filix-femina common lady fern
Athyrium filix-femina var. angustum northeastern lady fern
Athyrium niponicum Japanese painted fern
Athysanus pusillus dwarf anthysanus
Atriplex canescens four-wing saltbush
Atriplex cordulata heartleaf orach
Atriplex coronata var. vallicola Lost Hills crownscale
Atriplex dioica saline saltbush
Atriplex glabriuscula glabrous saltbush
Atriplex gmelinii var. alaskensis Alaska orache
Atriplex joaquiniana San Joaquin orach
Atriplex littoralis narrowleaf orache
Atriplex parishii var. depressa depressed orach
Atriplex patula common orache
Atriplex powellii Powell's saltbush
Atriplex prostrata thinleaf orach
Atriplex truncata wedgeleaf orache
Aubrieta deltoidea false rockcress
Aubrieta Xcultorum common rockcress
Aucuba japonica Japanese aucuba
Aureolaria flava
Aureolaria patula
Aureolaria pedicularia fernleaf yellow false foxglove
Aureolaria pedicularia var. pedicularia fernleaf yellow false foxglove
Aurinia saxatilis basket of gold
Avena fatua common wild oats
Avena sativa cultivated oats
Avenula hookeri spike oatgrass
Axyris amaranthoides Russian pigweed
Azara lanceolata narrowleaf azara
Azara microphylla boxleaf azara
Azolla caroliniana eastern mosquito fern