- Abdra brachycarpa (Short-fruited whitlow-grass)
- Abutilon theophrasti (Velvetleaf)
- Acalypha rhomboidea (Common three-seeded mercury)
- Achillea millefolium (Yarrow)
- Actaea racemosa (Black cohosh)
- Aegopodium podagraria (Goutweed)
- Agalinis purpurea (Purple false foxglove, Smooth gerardia)
- Agastache nepetoides (Yellow giant-hyssop)
- Ageratina altissima (White snakeroot)
- Ageratina aromatica (Small-leaf white snakeroot, Lesser snakeroot)
- Agrimonia gryposepala (Tall hairy agrimony)
- Agrimonia parviflora (Southern agrimony, Swamp agrimony, Harvest-lice)
- Agrimonia pubescens (Downy agrimony)
- Agrimonia rostellata (Woodland agrimony)
- Ajuga reptans (Carpet bugle, Bugleweed)
- Alliaria petiolata (Garlic mustard)
- Allium canadense (Wild onion, Meadow garlic)
- Allium cernuum (Nodding onion)
- Allium tricoccum (Ramps)
- Allium tuberosum (Chinese chives)
- Allium vineale (Wild garlic)
- Amaranthus spinosus (Spiny amaranth)
- Ambrosia artemisiifolia (Common ragweed)
- Ambrosia trifida (Giant ragweed)
- Amphicarpaea bracteata (Hog peanut)
- Anagallis arvensis (Scarlet pimpernel)
- Andersonglossum virginianum (Wild comfrey)
- Anemone quinquefolia (Wood anemone)
- Anemone virginiana (Tall thimbleweed)
- Antennaria neglecta (Field pussytoes)
- Antennaria parlinii (Parlin's pussytoes)
- Antennaria plantaginifolia (Plantain-leaved pussytoes)
- Anthemis arvensis (Corn chamomile)
- Aphyllon uniflorum (Cancer-root, Naked broomrape)
- Apocynum androsaemifolium (Spreading dogbane)
- Apocynum cannabinum (Indian hemp, Common dogbane)
- Aquilegia canadensis (Wild columbine)
- Arabidopsis lyrata (Lyrate rockcress)
- Arabidopsis thaliana (Mouse-ear cress)
- Arabis patens (Spreading rockcress)
- Aralia nudicaulis (Wild sarsaparilla)
- Arctium minus (Common burdock)
- Arenaria serpyllifolia (Thyme-leaved sandwort)
- Arisaema triphyllum (Jack in the pulpit)
- Arnoglossum atriplicifolium (Pale indian plantain)
- Artemisia annua (Sweet wormwood, Sweet Annie)
- Artemisia vulgaris (Common mugwort)
- Asarum canadense (Wild ginger)
- Asclepias incarnata (Swamp milkweed)
- Asclepias purpurascens (Purple milkweed)
- Asclepias syriaca (Common milkweed)
- Asclepias tuberosa (Butterfly weed)
- Asclepias verticillata (Whorled milkweed)
- Asclepias viridiflora (Green milkweed)
- Barbarea vulgaris (Yellow rocket, Bitter wintercress)
- Bidens aristosa (Tickseed sunflower, Midwestern tickseed-sunflower, Bearded beggarticks, Bur marigold)
- Bidens bipinnata (Spanish needles)
- Bidens cernua (Nodding beggarticks, Nodding bur-marigold)
- Bidens connata (Purple-stem beggarticks)
- Bidens frondosa (Devil's beggarticks, Common beggarticks)
- Bidens laevis (Smooth beggarticks, Smooth bur-marigold)
- Boechera laevigata (Smooth rockcress)
- Boehmeria cylindrica (False nettle)
- Brasenia schreberi (Water shield)
- Brassica rapa (Field mustard)
- Buglossoides arvensis (Corn gromwell)
- Callicarpa americana (American beautyberry)
- Calystegia sepium (Hedge bindweed)
- Campsis radicans (Trumpet creeper, Trumpet vine)
- Capsella bursa-pastoris (Shepherd's purse)
- Cardamine angustata (Slender toothwort)
- Cardamine bulbosa (Spring cress, Bulbous bittercress)
- Cardamine concatenata (Cutleaf toothwort)
- Cardamine douglassii (Purple cress)
- Cardamine hirsuta (Hairy bittercress)
- Cardamine pensylvanica (Pennsylvania bittercress)
- Carduus acanthoides (Plumeless thistle, Spiny plumeless thistle)
- Carduus nutans (Musk thistle)
- Caulophyllum thalictroides (Blue cohosh)
- Centaurea cyanus (Bachelor's button)
- Centaurea stoebe (Spotted knapweed)
- Centaurea x moncktonii (Monckton's knapweed)
- Cerastium fontanum (Mouse-ear chickweed)
- Cerastium glomeratum (Sticky chickweed)
- Cerastium velutinum (Field chickweed)
- Chaerophyllum tainturieri (Hairy-fruit chervil, Southern chervil)
- Chamaecrista fasciculata (Partridge pea)
- Chelidonium majus (Greater celandine)
- Chelone glabra (White turtlehead)
- Chrysogonum virginianum (Green and gold)
- Chrysosplenium americanum (Golden saxifrage)
- Cichorium intybus (Chicory)
- Cirsium arvense (Canada thistle)
- Cirsium discolor (Field thistle)
- Cirsium vulgare (Bull thistle)
- Claytonia virginica (Spring beauty, Virginia spring beauty)
- Clematis ochroleuca (Curlyheads)
- Clematis terniflora (Sweet autumn clematis)
- Clematis viorna (Vasevine, Leatherflower)
- Clematis virginiana (Virgin's bower)
- Clinopodium vulgare (Wild basil)
- Collinsonia canadensis (Horse balm, Richweed)
- Comandra umbellata (Bastard toadflax)
- Commelina communis (Asiatic dayflower)
- Commelina diffusa (Climbing dayflower)
- Commelina virginica (Virginia dayflower)
- Conium maculatum (Poison hemlock)
- Conoclinium coelestinum (Blue mistflower)
- Conopholis americana (Bear corn, Squaw-root)
- Convolvulus arvensis (Field bindweed)
- Coreopsis lanceolata (Lance-leaf coreopsis)
- Coreopsis tinctoria (Golden tickseed, Plains coreopsis)
- Coreopsis verticillata (Whorled tickseed, Thread-leaf coreopsis)
- Corydalis flavula (Yellow corydalis)
- Corydalis incisa (Incised fumewort)
- Cryptotaenia canadensis (Honewort)
- Cunila origanoides (Common dittany)
- Cuphea viscosissima (Blue waxweed)
- Cymbalaria muralis (Ivy-leaved toadflax, Kenilworth ivy)
- Cypripedium acaule (Pink lady's slipper)
- Cypripedium parviflorum (Yellow lady's slipper)
- Daucus carota (Queen Anne's lace)
- Delphinium tricorne (Dwarf larkspur)
- Desmodium canadense (Showy Tick-trefoil)
- Desmodium canescens (Hoary Tick-trefoil)
- Desmodium ciliare (Hairy Small-leaf Tick-trefoil)
- Dianthus armeria (Deptford pink)
- Dicentra canadensis (Squirrel corn)
- Dicentra cucullaria (Dutchman's breeches)
- Diodia teres (Poorjoe, Rough buttonweed)
- Diodia virginiana (Virginia buttonweed)
- Dipsacus fullonum (Common teasel)
- Dipsacus laciniatus (Cut-leaf teasel)
- Draba verna (Spring whitlow-grass)
- Drosera intermedia (Spoonleaf sundew)
- Echinacea purpurea (Purple coneflower)
- Echium vulgare (Common viper's bugloss)
- Eclipta prostata (False daisy, Yerba-de-tajo)
- Elephantopus carolinianus (Carolina elephant's foot)
- Ellisia nyctelea (Aunt Lucy, Waterpod)
- Epifagus virginiana (Beechdrops)
- Epigaea repens (Trailing arbutus)
- Epipactis helleborine (Broadleaf helleborine)
- Erechtites hieraciifolius (American burnweed, Pilewort)
- Erigenia bulbosa (Harbinger of spring, Pepper and salt)
- Erigeron annuus (Annual fleabane, Eastern daisy fleabane)
- Erigeron canadensis (Horseweed)
- Erigeron philadelphicus (Philadelphia fleabane, Common fleabane)
- Erigeron strigosus (Rough fleabane, Lesser daisy fleabane)
- Erodium cicutarium (Storksbill)
- Erythronium albidum (White trout lily)
- Erythronium americanum (Trout lily, Yellow trout lily)
- Eupatorium hyssopifolium (Hyssopleaf thoroughwort)
- Eupatorium perfoliatum (Common boneset)
- Eupatorium rotundifolium (Roundleaf thoroughwort)
- Eupatorium serotinum (Late eupatorium, Late thoroughwort)
- Eupatorium sessilifolium (Upland boneset)
- Eupatorium torreyanum (Torrey's thoroughwort)
- Euphorbia corollata (Flowering spurge)
- Euphorbia maculata (Spotted spurge, Prostrate spurge)
- Eurybia divaricata (White wood aster)
- Euthamia graminifolia (Grass-leaf goldenrod, Flat-topped goldenrod)
- Eutrochium dubium (Three-nerved joe-pye weed)
- Eutrochium fistulosum (Hollow joe-pye weed)
- Eutrochium maculatum (Spotted joe-pye weed)
- Eutrochium purpureum (Sweet joe-pye weed, Purple-node joe-pye weed)
- Fagopyrum esculentum (Buckwheat)
- Ficaria verna (Lesser celandine)
- Fragaria virginiana (Wild strawberry)
- Galearis spectabilis (Wild orchis)
- Galinsoga quadriradiata (Peruvian daisy, Common quickweed)
- Galium aparine (Cleavers, Common bedstraw)
- Galium circaezans (Licorice bedstraw)
- Galium concinnum (Shining bedstraw)
- Galium mollugo (Hedge bedstraw)
- Galium obtusum (Bluntleaf bedstraw)
- Galium pedemontanum (Piedmont bedstraw)
- Galium pilosum (Hairy bedstraw)
- Galium sherardia (Field madder, Blue field madder)
- Galium tinctorium (Stiff marsh bedstraw)
- Galium triflorum (Three-flowered bedstraw)
- Geranium carolinianum (Carolina cranesbill)
- Geranium dissectum (Dissected cranesbill, Cut-leaved cranesbill)
- Geranium maculatum (Wild geranium)
- Geranium molle (Dovefoot geranium)
- Geranium pusillum (Small-flower cranesbill)
- Geum canadense (White avens)
- Geum vernum (Spring avens)
- Geum virginianum (Cream avens)
- Glechoma hederacea (Ground ivy, Gill-over-the-Ground, Creeping Charlie)
- Goodyera pubescens (Downy rattlesnake plantain)
- Gypsophila muralis (Low baby's-breath)
- Hedeoma pulegioides (American pennyroyal)
- Helenium autumnale (Common sneezeweed)
- Helenium flexuosum (Purple sneezeweed, Purple-headed sneezeweed)
- Helianthus angustifolius (Narrow-leaf sunflower)
- Helianthus annuus (Common sunflower)
- Helianthus decapetalus (Thinleaf sunflower)
- Helianthus divaricatus (Woodland sunflower)
- Helianthus laetiflorus (Cheerful sunflower)
- Helianthus mollis (Downy sunflower, Ashy sunflower)
- Helianthus tuberosus (Jerusalem artichoke)
- Heliopsis helianthoides (False sunflower, Smooth oxeye)
- Hepatica americana (Round-lobed hepatica)
- Hesperis matronalis (Dame's rocket)
- Heuchera americana (American alumroot)
- Hieracium gronovii (Hairy hawkweed, Gronovius' hawkweed)
- Hieracium paniculatum (Allegheny hawkweed, Panicled hawkweed)
- Hieracium scabrum (Rough hawkweed)
- Hieracium venosum (Rattlesnake weed)
- Houstonia caerulea (Azure bluet)
- Houstonia longifolia (Long-leaved bluet)
- Houstonia purpurea (Purple bluet)
- Houstonia pusilla (Tiny bluet)
- Humulus scandens (Japanese hops)
- Hydatica petiolaris (Michaux's saxifrage)
- Hydrophyllum canadense (Bluntleaf waterleaf)
- Hydrophyllum virginianum (Virginia waterleaf)
- Hylodesmum nudiflorum (Nakedflower Tick-trefoil)
- Hylodesmum pauciflorum (Fewflower Tick-trefoil)
- Hypericum canadense (Canada St Johnswort)
- Hypericum hypericoides (St Andrew's cross)
- Hypericum mutilum (Dwarf St Johnswort)
- Hypericum perforatum (Common St Johnswort)
- Hypericum prolificum (Shrubby St Johnswort)
- Hypericum punctatum (Spotted St Johnswort)
- Hypoxis hirsuta (Yellow stargrass, Common goldstar)
- Impatiens capensis (Orange jewelweed, Spotted jewelweed, Spotted touch-me-not)
- Impatiens pallida (Yellow jewelweed, Pale touch-me-not)
- Ipomoea hederacea (Ivy-leaf morning glory)
- Ipomoea lacunosa (Small white morning glory)
- Ipomoea pandurata (Wild potato vine, Big-root morning glory, Man of the earth)
- Iris domestica (Blackberry lily)
- Iris pseudacorus (Pale yellow iris, Yellow flag iris)
- Iris versicolor (Northern blueflag iris, Harlequin blueflag iris)
- Jeffersonia diphylla (Twinleaf)
- Justicia americana (American water-willow)
- Krigia cespitosa (Weedy dwarf-dandelion)
- Krigia dandelion (Potato dwarf-dandelion)
- Kummerowia stipulacea (Korean clover)
- Kummerowia striata (Japanese clover)
- Lactuca canadensis (Wild lettuce)
- Lactuca floridana (Woodland lettuce)
- Lactuca saligna (Willow-leaf lettuce)
- Lactuca serriola (Prickly lettuce)
- Lamium amplexicaule (Henbit, Henbit deadnettle)
- Lamium purpureum (Purple deadnettle)
- Laportea canadensis (Canada woodnettle)
- Lathyrus hirsutus (Caley pea)
- Lathyrus latifolius (Everlasting pea, Perennial peavine)
- Leonurus cardiaca (Motherwort)
- Lepidium campestre (Field pepperweed)
- Lepidium virginicum (Virginia pepperweed, Peppergrass)
- Lespedeza cuneata (Chinese bush-clover, Silky bush-clover)
- Lespedeza frutescens (Violet bush-clover)
- Lespedeza procumbens (Trailing bush-clover)
- Lespedeza repens (Creeping bush-clover)
- Lespedeza virginica (Slender bush-clover)
- Leucanthemum vulgare (Oxeye daisy)
- Liatris pilosa (Grass-leaf blazing star)
- Liatris squarrosa (Scaly blazing star)
- Lindernia dubia (False pimpernel)
- Lobelia cardinalis (Cardinal flower)
- Lobelia inflata (Indian tobacco)
- Lobelia puberula (Downy lobelia)
- Lobelia siphilitica (Great blue lobelia)
- Lonicera japonica (Japanese honeysuckle)
- Lonicera sempervirens (Trumpet honeysuckle)
- Lotus corniculatus (Birdfoot trefoil)
- Ludwigia alternifolia (Bushy seedbox)
- Ludwigia peploides (Floating primrose willow, Creeping water primrose)
- Lycopus americanus (American water horehound, American bugleweed)
- Lysimachia ciliata (Fringed loosestrife)
- Lysimachia nummularia (Creeping Jenny, Motherwort)
- Lysimachia quadrifolia (Whorled loosestrife)
- Lythrum salicaria (Purple loosestrife)
- Maianthemum canadense (Canada mayflower)
- Maianthemum racemosum (False Solomon's-seal)
- Malva neglecta (Common mallow)
- Matricaria discoidea (Disc mayweed)
- Mazus pumilus (Japanese mazus)
- Medeola virginiana (Indian cucumber-root)
- Medicago lupulina (Black medic)
- Melampyrum lineare (Cow-wheat)
- Melilotus albus (White sweet clover)
- Melilotus officinalis (Yellow sweet clover)
- Mentha canadensis (Wild mint)
- Mertensia virginica (Virginia bluebells)
- Micranthes virginiensis (Early saxifrage)
- Mikania scandens (Climbing hempweed, Climbing hempvine)
- Mimulus alatus (Sharpwing monkey flower)
- Mimulus ringens (Allegheny monkey flower)
- Mitchella repens (Partridgeberry)
- Mitella diphylla (Miterwort)
- Mollugo verticillata (Carpet-weed)
- Monarda didyma (Bee balm)
- Monarda fistulosa (Wild bergamot)
- Monarda punctata (Spotted beebalm)
- Monotropa uniflora (Ghost plant, Indian pipe)
- Mummenhoffia alliacea (Roadside pennycress)
- Murdannia keisak (Wart-removing herb)
- Myosotis arvensis (Field forget-me-not)
- Myosotis discolor (Changing forget-me-not)
- Myosotis macrosperma (Large-seed forget-me-not)
- Myosotis ramosissima (Early forget-me-not)
- Myosotis stricta (Strict forget-me-not)
- Myosotis verna (Spring forget-me-not)
- Nepeta cataria (Catnip)
- Nuphar advena (Spatterdock, Yellow pond-lily)
- Nymphaea odorata (American white water-lily, Fragrant water-lily)
- Obolaria virginica (Virginia pennywort)
- Oenothera biennis (Common evening primrose)
- Oenothera fruticosa (Narrow-leaf sundrops)
- Oenothera gaura (Biennial gaura)
- Oenothera pilosella (Meadow evening primrose, Prairie sundrops)
- Oenothera speciosa (Showy evening primrose)
- Ornithogalum nutans (Drooping star-of-bethlehem)
- Ornithogalum umbellatum (Common star-of-bethlehem)
- Orontium aquaticum (Golden club)
- Osmorhiza claytonii (Sweet cicely)
- Osmorhiza longistylis (Aniseroot)
- Oxalis violacea (Violet wood-sorrel)
- Packera anonyma (Small's ragwort)
- Packera aurea (Golden ragwort)
- Packera obovata (Round-leaf ragwort)
- Panax trifolius (Dwarf ginseng)
- Pedicularis canadensis (Wood betony, Lousewort)
- Penstemon canescens (Eastern gray beardtongue)
- Penstemon digitalis (Foxglove beardtongue)
- Penstemon hirsutus (Hairy beardtongue)
- Penstemon laevigatus (Eastern smooth beardtongue)
- Perilla frutescens (Shiso, Beefsteak plant)
- Persicaria hydropiperoides (Swamp smartweed, Mild waterpepper)
- Persicaria longiseta (Oriental lady's-thumb)
- Persicaria pensylvanica (Pennsylvania smartweed)
- Persicaria perfoliata (Asiatic tearthumb)
- Persicaria punctata (Dotted smartweed)
- Persicaria sagittata (Arrowleaf tearthumb)
- Persicaria virginiana (Jumpseed)
- Phacelia covillei (Coville's phacelia)
- Phacelia dubia (Appalachian phacelia, Smallflower phacelia)
- Phlox divaricata (Woodland phlox, Wild blue phlox)
- Phlox paniculata (Garden phlox, Summer phlox)
- Phlox subulata (Creeping phlox)
- Phryma leptostachya (Lopseed)
- Phyla lanceolata (Lance-leaf frogfruit)
- Physostegia virginiana (Obedient plant)
- Phytolacca americana (Pokeweed, American pokeweed)
- Pilosella caespitosa (Meadow hawkweed, Yellow king-devil)
- Platanthera lacera (Green fringed orchid, Ragged fringed orchid)
- Podophyllum peltatum (Mayapple)
- Polemonium reptans (Jacob's ladder)
- Polygala sanguinea (Field milkwort, Blood milkwort, Purple milkwort)
- Polygala verticillata (Whorled milkwort)
- Polygonatum biflorum (Smooth Solomon's-seal)
- Polygonum aviculare (Prostrate knotweed)
- Pontederia cordata (Pickerelweed)
- Portulaca oleracea (Purslane)
- Potentilla canadensis (Dwarf cinquefoil)
- Potentilla indica (Mock strawberry, Indian strawberry)
- Potentilla norvegica (Rough cinquefoil, Norwegian cinquefoil)
- Potentilla recta (Sulphur cinquefoil, Rough-fruited cinquefoil)
- Potentilla simplex (Common cinquefoil)
- Primula meadia (Eastern shooting star)
- Prunella vulgaris (Common self heal, Heal all)
- Pseudognaphalium obtusifolium (Sweet everlasting, Rabbit tobacco)
- Pycnanthemum incanum (Hoary mountain mint)
- Pycnanthemum muticum (Clustered mountain mint)
- Pycnanthemum tenuifolium (Slender mountain mint, Narrow-leaf mountain mint)
- Ranunculus abortivus (Little-leaf buttercup)
- Ranunculus bulbosus (Bulbous buttercup)
- Ranunculus hispidus (Bristly buttercup)
- Ranunculus recurvatus (Hooked buttercup)
- Ratibida pinnata (Gray-headed coneflower, Yellow coneflower, Pinnate prairie coneflower)
- Rhexia mariana (Maryland meadow-beauty)
- Rhexia virginica (Virginia meadow-beauty)
- Rosa canina (Dog rose)
- Rosa carolina (Carolina rose)
- Rosa multiflora (Multiflora rose)
- Rosa palustris (Swamp rose)
- Rubus allegheniensis (Allegheny blackberry)
- Rubus bifrons (Himalayan blackberry)
- Rubus flagellaris (Common dewberry)
- Rubus hispidus (Swamp dewberry)
- Rubus occidentalis (Black raspberry)
- Rubus odoratus (Purple-flowering raspberry)
- Rubus pensilvanicus (Pennsylvania blackberry)
- Rubus phoenicolasius (Wineberry)
- Rudbeckia fulgida (Orange coneflower)
- Rudbeckia hirta (Black-eyed susan)
- Rudbeckia lacinata (Cutleaf coneflower)
- Rudbeckia triloba (Brown-eyed susan)
- Ruellia caroliniensis (Carolina wild petunia)
- Rumex crispus (Curly dock)
- Rumex obtusifolius (Bitter dock)
- Sabatia angularis (Rose pink, Rose gentian)
- Sabatia dodecandra (Marsh rose gentian)
- Sagittaria latifolia (Broadleaf arrowhead, Common arrowhead)
- Salvia lyrata (Lyreleaf sage)
- Sanguinaria canadensis (Bloodroot)
- Saponaria officinalis (Soapwort, Bouncing Bet)
- Saururus cernuus (Lizard's tail)
- Scutellaria elliptica (Hairy skullcap)
- Scutellaria incana (Downy skullcap)
- Scutellaria integrifolia (Hyssop skullcap, Helmet flower)
- Scutellaria nervosa (Veiny skullcap)
- Securigera varia (Crown vetch)
- Sedum sarmentosum (Stringy stonecrop)
- Sedum ternatum (Wild stonecrop)
- Senecio vulgaris (Common groundsel)
- Sericocarpus asteroides (Toothed whitetop aster)
- Silene caroliniana (Wild Pink)
- Silene latifolia (White campion)
- Silene stellata (Starry campion)
- Silene vulgaris (Bladder campion)
- Silphium asteriscus (Starry rosinweed)
- Sisyrinchium angustifolium (Narrowleaf blue-eyed grass, Stout blue-eyed grass)
- Sisyrinchium mucronatum (Needle-tip blue-eyed grass)
- Solanum carolinense (Carolina horsenettle)
- Solanum dulcamara (Bittersweet nightshade)
- Solanum ptychanthum (Eastern black nightshade)
- Solidago rigida (Stiff goldenrod)
- Sonchus asper (Prickly sow-thistle)
- Spiranthes lacera (Slender ladies'-tresses)
- Stachys hispida (Hispid hedgenettle)
- Stellaria graminea (Common stitchwort)
- Stellaria media (Common chickweed)
- Stellaria pubera (Star chickweed)
- Strophostyles helvola (Trailing wild bean)
- Strophostyles umbellata (Pink wild bean, Perennial wild bean, Pink fuzzybean)
- Stylosanthes biflora (Pencil flower)
- Symphyotrichum laeve (Smooth blue aster)
- Symphyotrichum lanceolatum (Panicled aster)
- Symphyotrichum lateriflorum (Calico aster)
- Symphyotrichum novae-angliae (New England aster)
- Symphyotrichum patens (Late purple aster, Spreading aster)
- Symphyotrichum puniceum (Purple-stemmed aster, Swamp aster)
- Symphyotrichum racemosum (Small white aster, Smooth white oldfield aster)
- Symplocarpus foetidus (Skunk cabbage)
- Taraxacum officinale (Dandelion, Common dandelion)
- Teesdalia nudicaulis (Shepherd's cress)
- Teucrium canadense (American germander)
- Thalictrum dioicum (Early meadow rue)
- Thalictrum pubescens (Tall meadow-rue, King of the meadow)
- Thalictrum revolutum (Waxy-leaf meadow rue, Skunk meadow rue)
- Thalictrum thalictroides (Rue Anemone)
- Tiarella cordifolia (Heartleaf foamflower)
- Tipularia discolor (Cranefly orchid)
- Tradescantia virginiana (Virginia spiderwort)
- Trichostema dichotomum (Blue curls)
- Trifolium arvense (Rabbit-foot clover, Hare's-foot clover)
- Trifolium aureum (Golden clover, Greater hop-clover)
- Trifolium campestre (Low hop-clover)
- Trifolium dubium (Lesser hop-clover)
- Trifolium pratense (Red clover)
- Trifolium repens (White clover)
- Trillium cuneatum (Sweet Betsy)
- Trillium grandiflorum (Large-flowered trillium)
- Trillium sessile (Toadshade, Sessile trillium)
- Triodanis perfoliata (Clasping Venus' looking-glass)
- Tussilago farfara (Coltsroot)
- Urtica dioica (European Stinging nettle)
- Utricularia inflata (Swollen bladderwort)
- Uvularia perfoliata (Perfoliate bellwort)
- Valerianella locusta (Common cornsalad)
- Valerianella radiata (Beaked cornsalad)
- Verbascum blattaria (Moth mullein)
- Verbascum thapsus (Common mullein, Wooly mullein)
- Verbena hastata (Blue vervain)
- Verbena simplex (Narrowleaf vervain)
- Verbena urticifolia (White vervain)
- Verbesina alternifolia (Wingstem)
- Verbesina occidentalis (Yellow crownbeard)
- Veronica arvensis (Corn speedwell)
- Veronica hederifolia (Ivy-leaved speedwell)
- Veronica officinalis (Common speedwell, Common gypsyweed)
- Veronica persica (Bird's eye speedwell, Persian speedwell)
- Veronica polita (Gray field speedwell)
- Veronica serpyllifolia (Thyme-leaved speedwell)
- Vicia sativa (Common vetch, Garden vetch)
- Vicia villosa (Hairy vetch)
- Vinca major (Greater periwinkle)
- Vinca minor (Lesser periwinkle)
- Viola affinis (Sand violet)
- Viola bicolor (Field pansy)
- Viola canadensis (Canada violet, Tall white violet)
- Viola cucullata (Marsh blue violet)
- Viola hirsutula (Southern wood violet)
- Viola lanceolata (Lance-leaf violet)
- Viola palmata (Early blue violet)
- Viola pedata (Birdfoot violet)
- Viola primulifolia (Primrose-leaf violet)
- Viola pubescens (Downy yellow violet)
- Viola sagittata (Arrow-leaf violet)
- Viola sororia (Common blue violet)
- Viola striata (Striped white violet, Creamy violet)
- Viola subsinuata (Wavy-leaf violet)
- Xyris difformis (Bog yellow-eyed grass)
- Youngia japonica (Oriental false hawksbeard, Asiatic false hawksbeard)