| A |
| Abelia chinesis, Chinese abelia |
| Abelia mosanensis, Fragrant abelia |
| Abelia x grandiflora 'Edward Goucher', Edward Goucher abelia |
| Abelia x grandiflora 'Frances Mason', Frances Mason abelia |
| Abelia x grandiflora 'Prostrata', Prostrate abelia |
| Abelia x grandiflora 'Sunrise', Sunrise abelia |
| Abelia x grandiflora, Glossy abelia |
| Abeliophyllum distichum, White forsythia; Korean abelia |
| Abies balsamea, Balsam fir |
| Abies cilicica, Cilicica fir |
| Abies concolor, White fir; Colorado fir |
| Abies concolor 'Compacta', Compact white fir |
| Abies firma, Japanese fir; Momi fir |
| Abies fraseri, Fraser fir |
| Abies koreana, Korean fir |
| Abies lasiocarpa, Rocky mountain fir; Alpine fir |
| Abies nordmanniana, Nordman fir; Caucasian fir |
| Abies pinagene, Norway spruce |
| Abutilon hybridum, Flowering maple |
| Acalypha wilkesiana, Cooperleaf |
| Acanthopanax sieboldianus = Eleutherococcus sieboldianus, Fiveleaf aralia; Angelica shrub |
| Acanthus spinosus, Bear's breeches |
| Acer barbatum (Acer saccharum ssp. floridanum), Southern sugar maple; Florida maple |
| Acer barbatum, Southern sugar maple |
| Acer buergeranum, Trident maple |
| Acer campestre, Hedge maple |
| Acer capillipes, Japanese strippedbark maple |
| Acer cappadocicum, Coliseum maple; Cappadocian maple |
| Acer cissifolium, Ivyleaved maple |
| Acer crataegifolium, Hawthorn maple |
| Acer diabolicum, Devil maple |
| Acer ginnala, Amur maple |
| Acer griseum, Paperbark maple |
| Acer japonica f. aconitifolium, Fernleaf maple |
| Acer japonicum, Fullmoon maple |
| Acer leucoderme = Acer saccharum ssp. leucoderme, Calk maple; Whitebarked maple |
| Acer maxmowiczianum, Nikko maple |
| Acer mono = Acer truncatum subsp. mono, Painted maple |
| Acer negundo, Boxelder |
| Acer nigrum, Black maple |
| Acer nikoense, Nikko maple |
| Acer nipponicum, Nippon maple |
| Acer palmatum, Japanese maple |
| Acer palmatum, Japanese maple cultivars |
| Acer palmatum 'Sangokaku', Coral bark Japanese maple |
| Acer platanoides, Norway maple |
| Acer platanoides 'Stand Fast', Stand Fast maple |
| Acer pseudoplatanus, Sycamore maple |
| Acer rubrum, Red maple |
| Acer rufinerve, Redvein maple; Snakebark maple |
| Acer saccharinum, Silver maple |
| Acer saccharum, Sugar maple |
| Acer sieboldiamum, Sielbold maple |
| Acer spicatum, Mountain maple |
| Acer tegmentosum, Manchu striped maple |
| Acer triflorum, Threeflower maple |
| Acer truncatum, Purple blow maple |
| Achillea millefolium, Yarrow; Common yarrow; Milfoil |
| Achillea spp., Yarrow |
| Achillea tomentosa, Wooly yarrow |
| Achimenes, Magic Flower; Orchid Pansy; Widow's tears; Nut-orchid; Mother's tears |
| Acidanthera bicolor, Abyssinian; Fragrant gladiolus; Sword lily |
| Aconitum spp., Monkshood |
| Aconitum uncinatum, Monkshood |
| Acorus calamus 'Aureovariegatus', Sweet flag |
| Acorus calamus 'Variegatus', Variegated sweet flag |
| Acorus calomus, Sweetflag; Sweetgrass |
| Acorus gramimineus, Dwarf sweet flag; Grassy-leaved sweet flag; Japanese rush |
| Acorus gramineus, Japanese sweet flag |
| Acorus gramineus, Japanese sweetflag |
| Actaea pachypoda, Baneberry Doll's eyes; Necklace weed; White cohosh |
| Actinidia chinensis, Kiwi Fruit; Chinese gooseberry |
| Actinidia kolomikta, Kiwi; Kolomikta vine |
| Actinidia melanandra, Kiwi |
| Actinomeris alternifolia, Wingstem |
| Adiantum capillus vereris, Southern maidenhair fern; Venus maidenhair fern |
| Adiantum pedatum, Northern maidenhair fern; Common maidenhair |
| Adiantum raddianum, Maidenhair fern; Delta maidenhair; Pacific maidenhair |
| Adina rubella, Chinese buttonbush; Glossy adina |
| Aegopodium podograria 'Variegatum', Variegated Bishops' weed |
| Aesculus california, California buckeye |
| Aesculus glabra, Ohio buckeye |
| Aesculus hippocastamon, Common horsechestnut |
| Aesculus octandra, Yellow buckeye |
| Aesculus parviflora, Bottlebrush buckeye |
| Aesculus parviflora, Bottlebrush buckeye |
| Aesculus x carnea, Red horse chestnut |
| Aesculus pavia, Red buckeye; Scarlet buckeye |
| Aesculus sylvatica = Aesculus georgiana, Painted buckeye |
| Aesculus x 'Arnoldiana', Arnold buckeye |
| Aesculus x 'Homestead', Homestead buckeye |
| Agalinis (Gerardia) purpurea, Purple gerardia |
| Agapanthus cultivars, African-lily |
| Agapanthus, Lily of the Nile, African lily |
| Agarista populifolia = Leucothoe axillaris, Fetter-bush; Florida leucothoe; Coast leucothoe |
| Agarista populifolia = Leucothoe populifolia, Florida leucothoe |
| Agastache foeniculum, Anise hyssop |
| Agava americana, Century plant |
| Agava parryi, Parry's agave; Century plant |
| Agava salmiana, Pulque agave; Century plant |
| Ageratina spp., Snakeroot; White snakeroot |
| Ageratum houstonianum, Ageratum |
| Ailanthus altissima, Tree of heaven |
| Ajuga pyramidalis, Pyramidal ajuga |
| Ajuga reptans, Ajuga |
| Akebia quinata, Five-leaf akebia |
| Albizia julibrissin, Mimosa |
| Albizia kalkora, Kalkora mimosa |
| Albuca, Sentry-boxes, Soldier-in-the-box |
| Alcea rosea, Hollyhocks |
| Alchemilla mollis, Lady's mantle |
| Aletris farinosa, Colic-root; White stargrass |
| Alisma plantgoaquatica; A. subcordatum, Water plantain |
| Allamanda cathartica, Allamanda; Golden trumpet |
| Allium aflatunense, Ornamental onion |
| Allium caeruleum (A. azureum), Ornamental onion |
| Allium canadense, Wild garlic |
| Allium christophii (A. albopilosum), Ornamental onion |
| Allium cowanii, Ornamental onion |
| Allium giganteum, Ornamental onion |
| Allium karataviense, Ornamental onion |
| Allium moly (A. luteum), Garlic onion |
| Allium neopolitanum, Ornamental onion |
| Allium oreophilum (A. ostrowskianum), Ornamental onion |
| Allium schoenoprasum, Chives |
| Allium sphaerocephalon, Drumsticks; Ornamental onion |
| Allium tricoccum, Ramps; Wild leek |
| Allium, Ornamental onions |
| Alnus glutinosa, Common alder; European alder; Black alder |
| Alnus hirsuta, Manchurian alder |
| Alnus japonica, Japanese alder |
| Alnus serrulata, Tag alder; Hazel alder |
| Alnus x hybrida, Hybrid alnus |
| Aloysia triphylla, Lemon verbena |
| Alstroemeria, Peruvian lily; Lily-of-the-Incas |
| Alternanthera dentata, Upright calico plant |
| Amaranthus 'Magic Fountain', Amaranthus; Magic fountain |
| Amaranthus caudatus, Love-lies-bleeding |
| Amaranthus tricolor, Fountain plant |
| Amaryllis = Hippeastrum, Dutch amaryllis |
| Amaryllis belladonna, August lily; Belladonna lily; Naked lady |
| Amelanchier alnifolia, Saskatoon serviceberry |
| Amelanchier arborea var. arborea, Serviceberry; Shadblow |
| Amelanchier arborea var. arborea, Downy serviceberry; Shadblow |
| Amelanchier arborea var. laevis, Serviceberry; Allegheny serviceberry |
| Amelanchier arborea, Downy serviceberry; Shadbush |
| Amelanchier canadensis, Shadbush serviceberry |
| Amelanchier laevis, Allegheney serviceberry |
| Amelanchier x grandiflora, Apple serviceberry |
| Amianthium muscitoxicum, Fly poison |
| Ammi majus, False Queen Anne's lace, |
| Ammobium alatum, Winged everlasting |
| Amorpha canescens, Leadplant amorpha |
| Amorpha fruticosa, Indigo bush |
| Amorpha fruticosa, Indigo bush amorpha; Bastard indigo |
| Ampelopsis arborea, Pepper vine |
| Ampelopsis brevipedunculata, Porcelain vine |
| Amsonia tabernaemontana, Blue star; Blue dogbane |
| Anaphalis spp., Pearly everlasting |
| Anchusa azurea, Alkanet |
| Anchusa capensis, Bugloss; Cape forget-me-not; Summer forget-me-not |
| Andromeda polifolia, Marsh andromeda; Bog-rosemary |
| Andropogon gerardii, Big bluestem; Turkey foot |
| Andropogon glomeratus (Andropogon virginus var. abbreviatus), Bush beard grass |
| Andropogon virginicus, Broomsedge; Beard grass; Broomstraw |
| Anemone blanda, Anemone |
| Anemone coronaria, Anemones; Windflowers |
| Anemone coronaria, St. Brigid de Caen; Windflower |
| Anemone fulgens 'St Bavo', Anemones |
| Anemone pulsatilla, Pasque flower; Wind flower; Meadow anemone |
| Anemone quinquefolia; Thalictrum thalictrodes, Windflower; Wood anemone |
| Anemone riparia, Thimbleweed; Large white-flowered anemone |
| Anemone virginiana, Thimbleweed; Tall anemone |
| Anemone x hybrida, Japanese anemone |
| Anemonella thalictroides, Rue anemone |
| Anethum graveolens, Dill |
| Angelica archangelica, Angelica |
| Angelica triquinata, Filmy angelica |
| Angelonia angustifolia, Summer snapdragon |
| Anisostichus carpreolatus (Bignonia capreolata), Cross vine |
| Antennaria dioica, Pussytoes |
| Antennaria solitaria, Pussy-toes |
| Antennaria spp., Pussytoes |
| Anthericum liliago, St. Bernard's Lily |
| Antholyza, Aunt Eliza rat's rail |
| Anthoxanthum odoratum, Sweet vernal grass |
| Anthriscus cerefolium, Chervil |
| Antigonon leptopus, Coral vine |
| Antirrhinum majus, Snapdragon |
| Aplectrum hyemale, Puttyroot |
| Apocynum cannabinum, Indian hemp |
| Aquilegia canadensis, Wild columbine |
| Arachiodes simplicior, Indian holly fern; Variegated holly fern |
| Aralia elata 'Aureovariegata', Japanese angelica |
| Aralia elata 'Variegata', Variegated Japanes aralia |
| Aralia elata, Japanese angelica tree |
| Aralia spinosa, Hercules's club; Devil's walking stick |
| Aralia spinosa, Hercules's club; Devil's walking stick |
| Araujia sericifera, Cruel vine; Cruel plant; Bladder vine |
| Arbutus menziesii, Madrone |
| Arcrostaphy los uva-uisi, Bearberry |
| Arctium lappa, Great burdock |
| Arctium minus, Common burdock |
| Arctosis hybrids, African daisy |
| Ardisia crenata, Coral ardisia; Coralberry |
| Ardisia japonica 'Chirimen', Chirimen ardisia |
| Ardisia japonica, Japanese ardisia |
| Ardisia japonica, Japanese ardisia; Maleberry |
| Arenaria stricta, Rock sandwort |
| Arethusa bulbosa, Grass pink; Calopogon |
| Argyranthemum foeniculaceum, Lanceleaf marguerite |
| Arisaema draconitum, Green dragon; Dragon arum |
| Arisaema triphyllum, Jack-in-the-pulpit |
| Aristolochia durior, Dutchman's pipe |
| Armeria maritima, Sea thrift |
| Armeria martima, Common thrift; Sea pink; Maritime thrift |
| Aronia arbutifolia, Red chokeberry |
| Aronia arbutifolia, Red chokeberry; Chokeberry |
| Aronia melanocarpa, Black chokeberry |
| Aronia x prunifolia, Purple chokeberry |
| Arrhenatherum elatius subsp. bulbosum, Tuber oat grass; Bulbous oat grass |
| Artemesia ludoviciana, Sagewort; White sage |
| Artemisia abrotanum, Southernwood |
| Artemisia absinthium, Artemisia |
| Artemisia absinthium, Wormwood |
| Artemisia dracunculus, Tarragon |
| Artemisia spp., Artemisia |
| Aruncus dioicus, Goat's beard |
| Arundo domax 'Variegata', Giant variegated Mediterranean rush |
| Arundo donax, Giant reed |
| Asarum canadense, Wild ginger |
| Asarum canadense, Wild ginger; Canadian wild ginger |
| Asarum splendens, Chinese wild ginger |
| Asarum spp., Wild ginger |
| Asarum virginicum, Virginia wild ginger; Southern wild ginger; Heartleaf ginger |
| Asclepias curassavica, Blood flower; Annual milkweed |
| Asclepias incarnata, Swamp milkweed |
| Asclepias lanceolata, Asclepias; Lanceolated milkwort |
| Asclepias quadrifolia, Four-leaved milkweed |
| Asclepias syriaca, Common milkweed |
| Asclepias tuberosa, Butterfly weed |
| Asimina triloba, Pawpaw |
| Aspidistra elatior, Cast iron plant |
| Asplenium platyneuron, Ebony spleenwort |
| Asplenium rhizophyllum; Camptosorus rhyzophyllus, Walking fern |
| Asplenium trichomanes, Mountain spleenwort; Maidenhair spleenwort |
| Aster acuminatus, Whorled wood aster |
| Aster carolinianis, Climbing aster |
| Aster cordifolius, Heart-leafed aster; Common blue wood aster |
| Aster curtisii, Curtis aster |
| Aster divaricatus, White wood aster |
| Aster ericoides, Heath aster |
| Aster laevis, Smooth aster |
| Aster lateriflorus, Calico aster; Starved aster |
| Aster novae-angliae, New England aster |
| Aster oblongifolius var. angustatus, Eastern aromatic aster |
| Aster pilosus, Downy aster; White old-field aster |
| Aster prenanthoides, Crooked-stemmed aster |
| Aster spp., Aster |
| Aster spp., Aster |
| Aster umbellatus, Flat-topped white aster |
| Astilbe biternata, False goats beard |
| Astilbe x arendsii, Astilbe |
| Astragalus canadensis, Milk-vetch |
| Athyrium asplenioidesn, Southern lady fern |
| Athyrium filix femina 'Cristatum', Crested lady fern |
| Athyrium filix-femina var. asplenoioides, Southern lady fern |
| Athyrium filix-femina, Lady fern |
| Athyrium japonicum, Black lady fern |
| Athyrium nipponicum 'Pictum'; A. goeringianum 'Pictum', Japanese painted fern |
| Athyrium nipponicum; A. goeringianum; A. iseanum, Japanese painted fern |
| Athyrium pycnocarpon; Diplazium pycnocarpon, Glade fern; Narrow leaf spleenwort |
| Athyrium thelpteroides; Deparia acrostichoides, Silvery glade fern; Silvery spleenwort |
| Aucuba japonica, Aucuba |
| Aureolaria gerardia, False foxglove |
| Aureolaria pedicularia (Gerardia flava), Yellow false foxglove; Smooth false foxglove; Fern-leaf false foxglove |
| Aurinia saxatilis, Basket-of-gold |
| Azolla caroliniana, Fairy moss |