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Families: 136
Genera: 637
Species: 1637 (species rank)
Total Taxa: 1696 (including subsp. and var.)

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Acorus calamus L. - sweet-flag
Viburnum sp. L. - Arrow Wood
Viburnum acerifolium L. - maple-leaved viburnum
Viburnum dentatum L. - southern arrow-wood
Viburnum lantana L. - wayfaring-tree
Viburnum lentago L. - sheepberry
Viburnum opulus L. - high-bush cranberry
Viburnum prunifolium L. - smooth black-haw
Viburnum trilobum Marshall - high-bush cranberry
Alisma sp. L. - Water-plantain
Alisma subcordatum Raf. - southern water-plantain
Alisma triviale Pursh - northern water-plantain
Sagittaria sp. L. - Arrowhead
Sagittaria cristata Engelm. - crested arrow-head
Sagittaria rigida Pursh - stiff arrow-head
Amaranthus albus L. - white amaranth
Amaranthus blitoides S.Watson - prostrate pigweed
Amaranthus caudatus L. - purple amaranth
Amaranthus cruentus L. - red amaranth
Amaranthus hybridus L. - smooth pigweed
Amaranthus hypochondriacus L. - Prince-of-Wales'-feather
Amaranthus retroflexus L. - wild-beet amaranth
Atriplex hortensis L. - garden orache
Atriplex patula L. - spear saltbush
Chenopodium sp. L. - Goosefoot
Chenopodium berlandieri - pit-seed goosefoot
Chenopodium glaucum var. glaucum - oak-leaved goosefoot
Chenopodium pratericola Rydb. - narrow-leaf goosefoot
Chenopodium simplex (Torr.) Raf. - maple-leaved goosefoot
Chenopodium standleyanum Aellen - woodland goosefoot
Chenopodium strictum Roth - late-flowering goosefoot
Chenopodium urbicum L. - city goosefoot
Froelichia floridana (Nutt.) Moq. - plains snake-cotton
Salsola tragus L. - tumbleweed
Allium sp. L. - Garlic
Allium cepa L. - garden onion
Allium cernuum Roth - nodding wild onion
Rhus glabra L. - smooth sumac
Rhus typhina L. - staghorn sumac
Aethusa cynapium L. - fool's-parsley
Angelica atropurpurea L. - purple-stem angelica
Berula erecta (Huds.) Coville - low water-parsnip
Carum carvi L. - caraway
Cicuta bulbifera L. - bulblet water-hemlock
Cicuta maculata L. - spotted water-hemlock
Conium maculatum L. - poison-hemlock
Daucus carota L. - wild carrot
Eryngium planum L. - plains eryngo
Eryngium yuccifolium Michx. - rattlesnake-master
Heracleum maximum W.Bartram - American cow-parsnip
Osmorhiza longistylis (Torr.) DC. - smooth sweet cicely
Pastinaca sativa L. - wild parsnip
Polytaenia nuttallii DC. - prairie-parsley
Sanicula marilandica L. - Maryland sanicle
Sium suave Walter - water-parsnip
Torilis japonica (Houtt.) DC. - Japanese hedge-parsley
Zizia aptera (A.Gray) Fernald - heart-leaved meadow-parsnip
Apocynum androsaemifolium L. - spreading dogbane
Asclepias exaltata L. - tall milkweed
Asclepias incarnata - swamp milkweed
Asclepias lanuginosa Nutt. - woolly milkweed
Asclepias ovalifolia Decne. - oval-leaved milkweed
Asclepias verticillata L. - whorled milkweed
Asclepias viridiflora Raf. - short green milkweed
Vinca minor L. - running-myrtle
Ilex verticillata (L.) A.Gray - common winterberry
Arisaema triphyllum - Jack-in-the-pulpit
Lemna minor L. - small duckweed
Lemna trisulca L. - star duckweed
Lemna turionifera Landolt - Turion duckweed
Wolffia columbiana H.Karst. - common water-meal
Aralia sp. - Sarsaparilla
Aralia nudicaulis L. - wild sarsaparilla
Aralia racemosa L. - life-of-man
Asarum canadense L. - wild-ginger
Asparagus officinalis L. - garden asparagus
Maianthemum canadense Desf. - wild lily-of-the-valley
Maianthemum canadense var. canadense - wild lily-of-the-valley
Maianthemum racemosum - Solomon's-plume
Maianthemum stellatum (L.) Link - starry false Solomon's-seal
Muscari botryoides (L.) Mill. - common grape-hyacinth
Ambrosia psilostachya DC. - western ragweed
Ambrosia trifida L. - horse-cane
Antennaria neglecta Greene - field pussy-toes
Anthemis cotula L. - stinking-cotula
Arctium lappa L. - great burdock
Arctium tomentosum Mill. - woolly burdock
Arnoglossum plantagineum Raf. - prairie Indian-plantain
Artemisia abrotanum L. - southernwood
Artemisia annua L. - sweet wormwood
Artemisia biennis Willd. - biennial wormwood
Artemisia dracunculus L. - false tarragon
Bidens cernua L. - nodding bur-marigold
Bidens connata Muhl. ex Willd. - purple-stemmed tickseed
Bidens frondosa L. - devil's beggar-ticks
Bidens tripartita L. - swamp tickseed
Bidens vulgata Greene - tall beggar-ticks
Carduus nutans L. - nodding thistle
Carduus x orthocephalus Wallr. - plumeless thistle
Centaurea benedicta (L.) L. - blessed thistle
Centaurea cyanus L. - cornflower
Centaurea montana L. - mountain cornflower
Centaurea nigrescens Willd. - Vochin knapweed
Cirsium muticum Michx. - swamp thistle
Cirsium undulatum (Nutt.) Spreng. - wavy-leaved thistle
Coreopsis lanceolata L. - sand tickseed
Coreopsis palmata Nutt. - stiff tickseed
Coreopsis tinctoria Nutt. - plains tickseed
Coreopsis tripteris L. - tall tickseed
Cosmos bipinnatus Cav. - common garden cosmos
Crepis capillaris (L.) Wallr. - smooth hawk's-beard
Crepis tectorum L. - narrow-leaved hawk's-beard
Echinacea purpurea (L.) Moench - eastern purple coneflower
Erigeron annuus (L.) Pers. - eastern daisy fleabane
Erigeron philadelphicus - Philadelphia daisy
Erigeron pulchellus - Robin's-plantain
Eupatorium altissimum L. - tall thoroughwort
Eupatorium serotinum Michx. - late-flowering thoroughwort
Eurybia macrophylla (L.) Cass. - large-leaved aster
Euthamia graminifolia (L.) Nutt. - grass-leaved goldenrod
Euthamia gymnospermoides Greene - viscid grass-leaved goldenrod
Eutrochium maculatum L. - spotted Joe-Pye-weed
Gaillardia aristata Pursh - common gaillardia
Gnaphalium uliginosum L. - marsh cudweed
Grindelia lanceolata Nutt. - spiny-tooth gum-weed
Hasteola suaveolens (L.) Pojark. - sweet Indian-plantain
Helenium autumnale L. - common sneezeweed
Helianthus annuus L. - garden sunflower
Helianthus decapetalus L. - thin-leaved sunflower
Helianthus divaricatus L. - woodland sunflower
Helianthus giganteus L. - tall sunflower
Helianthus hirsutus Raf. - rough sunflower
Helianthus maximiliani Schrad. - Maximilian's sunflower
Helianthus occidentalis - western sunflower
Helianthus salicifolius A.Dietr. - willow-leaved sunflower
Helianthus strumosus L. - rough-leaved sunflower
Helianthus tuberosus L. - woodland sunflower
Heliopsis helianthoides (L.) Sweet - sunflower-everlasting
Hieracium caespitosum Dumort. - yellow king-devil
Hieracium scabrum Michx. - sticky hawkweed
Hieracium umbellatum L. - northern hawkweed
Inula helenium L. - elecampane
Iva axillaris Pursh - poverty-weed
Krigia biflora (Walter) S.F.Blake - orange dwarf-dandelion
Krigia virginica (L.) Willd. - Virginia dwarf-dandelion
Lactuca canadensis L. - wild lettuce
Lactuca serriola L. - prickly lettuce
Lapsana communis L. - nipplewort
Liatris aspera Michx. - rough gayfeather
Liatris cylindracea Michx. - barellhead gayfeather
Liatris pycnostachya (L.) Willd. - thick-spike gay-feather
Liatris spicata var. spicata - sessile-headed blazing-star
Nothocalais cuspidata (Pursh) Greene - prairie false dandelion
Packera aurea (L.) A.Löve & D.Löve - heart-leaved groundsel
Prenanthes alba L. - white rattlesnakeroot
Prenanthes racemosa Michx. - purple rattlesnake-root
Ratibida pinnata (Vent.) Barnhart - pinnate prairie coneflower
Rudbeckia hirta - black-eyed Susan
Rudbeckia laciniata L. - wild golden-glow
Rudbeckia subtomentosa Pursh - sweet coneflower
Rudbeckia triloba var. triloba - three-lobed coneflower
Senecio vulgaris L. - common groundsel
Silphium integrifolium Michx. - whole-leaf rosinweed
Silphium laciniatum L. - compass-plant
Silphium terebinthinaceum - prairie rosinweed
Solidago sp. L. - Goldenrod
Solidago canadensis L. - common goldenrod
Solidago flexicaulis L. - zigzag goldenrod
Solidago gigantea Aiton - smooth goldenrod
Solidago juncea Aiton - early goldenrod
Solidago missouriensis Nutt. - Missouri goldenrod
Solidago nemoralis Aiton - old-field goldenrod
Solidago riddellii Frank - Riddell's goldenrod
Solidago rigida L. - stiff goldenrod
Solidago sciaphila E.S.Steele - shadowy goldenrod
Solidago speciosa Nutt. - showy goldenrod
Solidago uliginosa Nutt. - northern bog goldenrod
Solidago ulmifolia - elm-leaved goldenrod
Sonchus sp. L. - Sow-Thistle
Sonchus arvensis L. - perennial sow-thistle
Sonchus asper (L.) Hill - spiny-leaf sow-thistle
Sonchus oleraceus L. - field sow-thistle
Tagetes erecta L. - French marigold
Tanacetum balsamita L. - mint-geranium
Tanacetum vulgare L. - golden-buttons
Tragopogon dubius Scop. - yellow salsify
Tragopogon pratensis L. - yellow goat's-beard
Vernonia fasciculata Michx. - smooth ironweed
Xanthium strumarium L. - rough cocklebur
Impatiens balfourii Hook.f. - Balfour's touch-me-not
Impatiens balsamina L. - spotted snap-weed
Impatiens capensis Meerb. - spotted touch-me-not
Impatiens glandulifera Royle - ornamental jewelweed
Impatiens pallida Nutt. - yellow touch-me-not
Berberis thunbergii DC. - Japanese barberry
Berberis vulgaris L. - European barberry
Podophyllum peltatum L. - wild mandrake
Betula cordifolia Regel - mountain white birch
Betula nigra L. - river birch
Betula pendula Roth - weeping birch
Betula pumila L. - swamp birch
Betula x sandbergii Britton - Sandberg's birch
Corylus americana Walter - American hazelnut
Catalpa ovata G.Don - Chinese catalpa
Echium vulgare L. - viper's-bugloss
Hackelia sp. - Beggar's-Lice
Hydrophyllum virginianum L. - Virginia waterleaf
Lithospermum incisum Lehm. - narrow-leaved puccoon
Myosotis laxa Lehm. - small forget-me-not
Myosotis scorpioides L. - water scorpion-grass
Myosotis verna Nutt. - white forget-me-not
Barbarea orthoceras Ledeb. - northern winter-cress
Berteroa incana (L.) DC. - hoary-alyssum
Boechera stricta (Graham) Al-Shehbaz - Drummond's rock-cress
Camelina microcarpa Andrz. ex DC. - small-fruited false flax
Camelina sativa (L.) Crantz - large-seed false flax
Cardamine flexuosa With. - bending bitter-cress
Cardamine impatiens L. - narrowleaf bittercress
Cardamine parviflora L. - small-flowered bitter-cress
Cardamine pensylvanica Muhl. ex Willd. - Pennsylvania bitter-cress
Diplotaxis muralis (L.) DC. - stinking wall-rocket
Draba arabisans Michx. - rock whitlow-grass
Draba reptans (Lam.) Fernald - common whitlow-grass
Erysimum cheiranthoides L. - worm-seed wallflower
Hesperis matronalis L. - dame's rocket
Lepidium densiflorum Schrad. - small peppergrass
Lepidium draba L. - white-top
Raphanus sativus L. - wild radish
Rorippa palustris (L.) Besser - common yellow-cress
Rorippa sylvestris (L.) Besser - creeping yellow-cress
Sinapis arvensis L. - charlock mustard
Sisymbrium altissimum L. - tall tumble mustard
Sisymbrium loeselii L. - tall hedge-mustard
Thlaspi arvense L. - field pennycress
Turritis glabra L. - tower rock-cress
Opuntia sp. Mill. - Prickly Pear
Opuntia macrorhiza Engelm. - twist-spine prickly-pear
Campanula aparinoides Pursh - marsh bellflower
Campanula rapunculoides L. - rover bellflower
Lobelia inflata L. - Indian-tobacco
Lobelia kalmii L. - Ontario lobelia
Lobelia siphilitica L. - great blue lobelia
Lobelia spicata Lam. - spiked lobelia
Triodanis perfoliata (L.) Nieuwl. - round-leaved triodanis
Cannabis sativa L. - marijuana
Celtis occidentalis L. - northern hackberry
Diervilla lonicera Mill. - northern bush-honeysuckle
Dipsacus laciniatus L. - cut-leaved teasel
Lonicera japonica Thunb. - Japanese honeysuckle
Lonicera maackii (Rupr.) Maxim. - Maack's honeysuckle
Lonicera morrowii A.Gray - Morrow's honeysuckle
Lonicera reticulata Raf. - yellow honeysuckle
Lonicera tatarica L. - Tartarian honeysuckle
Lonicera X bella Zabel - white-bell honeysuckle
Triosteum aurantiacum E.P.Bicknell - orange-fruit horse-gentian
Triosteum aurantiacum var. aurantiacum - orange-fruit horse-gentian
Valeriana officinalis L. - garden valerian
Agrostemma githago - corn cockle