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Abutilon theophrasti
Velvet-leaf
Acalypha rhomboidea
Rhomboid Copperleaf
Acer negundo var. negundo
Box Elder
Acer nigrum
Black Maple
Acer palmatum
Japanese Maple
Acer platanoides
Norway Maple
Acer rubrum var. rubrum
Red Maple
Acer rubrum var. trilobum
Red Maple
Acer saccharinum
Silver Maple
Acetosa acetosella
Sheep Dock
Achillea filipendulina
Fernleaf Yarrow
Achillea millefolium
Yarrow
Acorus calamus
European Sweetflag
Actaea racemosa
Black Cohosh
Actinomeris alternifolia
Wingstem
Actinomeris squarrosa
Wingstem
Adiantum pedatum
Maidenhair-fern
Aegopodium podagraria
Bishops Goutweed
Agalinis purpurea
Large-purple False Foxglove
Agastache nepetoides
Yellow Giant Hyssop
Ageratina altissima var. altissima
White Snakeroot
Ageratina aromatica
Lesser Snakeroot
Agrimonia parviflora
Swamp Agrimony
Agrimonia pubescens
Downy Agrimony
Ailanthus altissima
Tree-of-heaven
Ajuga reptans
Carpet Bugleweed
Albizia julibrissin
Silk Tree Mimosa
Alisma subcordatum
Broadleaf Water-plantain
Alliaria petiolata
Garlic Mustard
Allium canadense var. canadense
Meadow Onion
Allium tricoccum
Ramp
Allium vineale
Field Garlic
Alnus maritima subsp. maritima
Delmarva Alder
Alnus serrulata
Common Alder
Amaranthus hybridus
Smooth Amaranth
Amaranthus pumilus
Seabeach Amaranth
Amaranthus spinosus
Spiny Amaranth
Amblystegium varium
Tangled Thread Moss
Ambrosia artemisiifolia
Ragweed
Ambrosia trifida
Giant Ragweed
Amelanchier arborea
Downy Shadbush
Amelanchier canadensis var. canadensis
Shadbush
Amianthium muscitoxicum
Fly-poison
Amorpha fruticosa
False Indigo-bush
Ampelopsis brevipedunculata
Porcelain-berry
Ampelopsis glandulosa
Porcelain-berry
Ampelopsis glandulosa var. brevipedunculata
Porcelain-berry
Amphicarpaea bracteata var. bracteata
American Hog-peanut
Amphicarpaea bracteata var. comosa
Hairy American Hog-peanut
Amphicarpaea pitcheri
Hairy American Hog-peanut
Anagallis arvensis subsp. arvensis
Scarlet Pimpernel
Anchistea virginica
Virginia Chainfern
Andropogon scoparius
Little Bluestem
Anemone americana
Roundlobed Hepatica
Anemone quinquefolia var. quinquefolia
Wood Anemone
Anemone virginiana var. virginiana
Virginia Anemone
Anemonella thalictroides
Rue Anemone
Angelica venenosa
Hairy Angelica
Anomodon attenuatus
Poodle Moss
Antennaria fallax
Hairy Big-leaf Pussytoes
Antennaria neglecta
Pointed Little-leaf Pussytoes
Antennaria parlinii subsp. fallax
Hairy Big-leaf Pussytoes
Antennaria parlinii subsp. parlinii
Glabrous Big-leaf Pussytoes
Anthemis cotula
Mayweed
Anthoxanthum odoratum
Sweet Vernal Grass
Apios americana
Swamp Groundnut
Aplectrum hyemale
Puttyroot
Apocynum cannabinum
Clasping-leaf Dogbane
Aquilegia canadensis
Wild Columbine
Arabidopsis lyrata subsp. lyrata
Lyre-leaf Rockcress
Arabidopsis thaliana
Wall-cress
Arabis laevigata var. laevigata
Smooth Rockcress
Arabis lyrata
Lyre-leaf Rockcress
Aralia elata
Japanese Angelica-tree
Aralia nudicaulis
Wild Sarsaparilla
Aralia racemosa
American Spikenard
Aralia spinosa
Hercules Club
Arctium lappa
Great Burdock
Arctium minus
Lesser Burdock
Arenaria stricta
Rock Sandwort
Arisaema dracontium
Green Dragon
Arisaema triphyllum subsp. pusillum
Small Jack-in-the-pulpit
Arisaema triphyllum subsp. triphyllum
Swamp Jack-in-the-pulpit
Aristolochia serpentaria
Virginia Snakeroot
Arnoglossum atriplicifolium
Pale Indian-plantain
Aronia arbutifolia
Red Chokeberry
Aronia melanocarpa
Black Chokeberry
Artemisia annua
Annual Wormwood
Artemisia ludoviciana
Sagebrush Wormwood
Artemisia vulgaris
Mugwort
Arthraxon hispidus
Joint-head Arthraxon
Asarum canadense var. canadense
Canada Wild-ginger
Asclepias exaltata
Poke Milkweed
Asclepias incarnata subsp. pulchra
Swamp Milkweed
Asclepias purpurascens
Purple Milkweed
Asclepias syriaca
Common Milkweed
Asclepias tuberosa var. tuberosa
Butterfly Milkweed
Asclepias verticillata
Whorled Milkweed
Asclepias viridiflora
Green Milkweed
Ascyrum hypericoides var. multicaule
Decumbent St. Andrew's Cross
Asimina triloba
Pawpaw
Asparagus officinalis
Garden Asparagus
Asplenium platyneuron
Ebony Spleenwort
Aster cordifolius
Heart-leaf Aster
Aster cordifolius var. sagittifolius
Heart-leaf Aster
Aster divaricatus
White Wood Aster
Aster ericoides var. ericoides
White Heath Aster
Aster lanceolatus subsp. lanceolatus
Narrow-leaf Panicled Aster
Aster lanceolatus
Broad-leaf Panicled Aster
Aster lateriflorus var. lateriflorus
Starved Aster
Aster linariifolius
Flaxleaf Aster
Aster novae-angliae
New England Aster
Aster paniculatus
Narrow-leaf Panicled Aster
Aster paternus
Stiff Aster
Aster pilosus var. demotus
Smooth Heath Aster
Aster pilosus var. pilosus
Hairy Heath Aster
Aster puniceus var. puniceus
Bristly Aster
Aster sagittifolius
Heart-leaf Aster
Aster schreberi
Schreber's Aster
Aster simplex
Broad-leaf Panicled Aster
Aster subulatus var. subulatus
Annual Salt Marsh Aster
Aster undulatus
Clasping Heart-leaved Aster
Athyrium thelypterioides
Silvery False Spleenwort
Atriplex hastata
Spearscale
Atriplex patula var. hastata
Spearscale
Atriplex prostrata
Spearscale
Aureolaria pedicularia var. pedicularia
Fernleaf Yellow False Foxglove
Aureolaria virginica
Downy False-foxglove
Azolla caroliniana
Eastern Mosquito-fern