- Aconite, Winter (Eranthis hyemalis)
- Adder's Mouth, Green (Malaxis unifolia)
- Agrimony (Agrimonia gryposepala)
- Agrimony, Small-flowered (Agrimonia parviflora)
- Alexanders, Golden (Zizia aurea)
- Alfalfa (Medicago sativa)
- Alumroot (Heuchera americana)
- Alyssum, Hoary (Berteroa incana)
- Amaranth, Green (Amaranthus retroflexus)
- Anemone, Canada (Anemone canadensis)
- Anemone, Long-fruited (Anemone cylindrica)
- Anemone, Rue (Thalictrum thalictroides)
- Anemone, Small-flowered (Anemone parviflora)
- Anemone, Wood (Anemone quinquefolia)
- Angelica, Great (Angelica atropurpurea)
- Aniseroot (Osmorhiza longistylis)
- Apple-of-Peru (Nicandra physalodes)
- Arbutus, Trailing (Epigaea repens)
- Archangel, Yellow (Lamiastrum galeobdolon)
- Arethusa (Arethusa bulbosa)
- Arrowgrass, Marsh (Triglochin palustris)
- Arrowgrass, Seaside (Triglochin maritima)
- Arrowhead, Common (Sagittaria latifolia)
- Arrowwood, Downy (Viburnum rafinesquianum)
- Arrowwood, Smooth (Viburnum recognitum)
- Artichoke, Jerusalem (Helianthus tuberosus)
- Arum, Water (Calla palustris)
- Asparagus (Asparagus officinalis)
- Aster, Amethyst (Symphyotrichum x amethystinum)
- Aster, Arrow-leaved (Symphyotrichum urophyllum)
- Aster, Azure (Symphyotrichum oolentangiense)
- Aster, Bog (Oclemena nemoralis)
- Aster, Calico (Symphyotrichum lateriflorum)
- Aster, Flat-topped White (Doellingeria umbellata)
- Aster, Fringed Blue (Symphyotrichum ciliolatum)
- Aster, Frost (Symphyotrichum pilosum)
- Aster, Heart-leaved (Symphyotrichum cordifolium)
- Aster, Heath (Symphyotrichum ericoides)
- Aster, Large-leaved (Eurybia macrophylla)
- Aster, New England (Symphyotrichum novae-angliae)
- Aster, Ontario (Symphyotrichum ontarionis)
- Aster, Panicled (Symphyotrichum lanceolatum)
- Aster, Purple-stemmed (Symphyotrichum puniceum)
- Aster, Rayless Annual (Symphyotrichum ciliatum)
- Aster, Rush (Symphyotrichum boreale)
- Aster, Shreber's (Eurybia schreberi)
- Aster, Small Salt Marsh (Symphyotrichum subulatum)
- Aster, Smooth (Symphyotrichum laeve)
- Aster, Upland White (Solidago ptarmicoides)
- Aster, White Wood (Eurybia divaricata)
- Aster, Whorled (Oclemena acuminata)
- Aster, Willow (Symphyotrichum praealtum)
- Avens, Catlings (Geum X catlingii)
- Avens, Spring (Geum vernum)
- Avens, Water (Geum rivale)
- Avens, White (Geum canadense)
- Avens, Wood (Geum urbanum)
- Avens, Yellow (Geum aleppicum)
- Baneberry, Red (Actaea rubra)
- Baneberry, White (Actaea pachypoda)
- Barberry, European (Berberis vulgaris)
- Barberry, Japanese (Berberis thunbergii)
- Bartonia, Yellow (Bartonia virginica)
- Basil, Wild (Clinopodium vulgare)
- Bean, Trailing Wild (Strophostyles helvola)
- Bearberry (Arctostaphylos uva-ursi)
- Beardtongue, Foxglove (Penstemon digitalis)
- Beardtongue, Hairy (Penstemon hirsutus)
- Bedstraw, Labrador (Galium labradoricum)
- Bedstraw, Purple (Galium latifolium)
- Bedstraw, Small (Galium trifidum)
- Bedstraw, Sweet-scented (Galium triflorum)
- Bedstraw, Yellow (Galium verum)
- Beechdrops (Epifagus virginiana)
- Bellflower, Clustered (Campanula glomerata)
- Bellflower, Creeping (Campanula rapunculoides)
- Bellflower, Marsh (Campanula aparinoides)
- Bellflower, Tall (Campanula americana)
- Bellwort, Large-flowered (Uvularia grandiflora)
- Bellwort, Perfoliate (Uvularia perfoliata)
- Bellwort, Sessile-leaved (Uvularia sessilifolia)
- Bergamot, Wild (Monarda fistulosa)
- Betony, Wood (Pedicularis canadensis)
- Bindweed, Eurasian Black (Fallopia convolvulus)
- Bindweed, Field (Convolvulus arvensis)
- Bindweed, Hedge (Calystegia sepium)
- Bindweed, Upright (Calystegia spithamaea)
- Bird's Nest, Giant (Pterospora andromedea)
- Bistort, Alpine (Bistorta vivipara)
- Black-eyed Susan (Rudbeckia hirta)
- Bladderwort, Common (Utricularia vulgaris)
- Bladderwort, Flat-leaved (Utricularia intermedia)
- Bladderwort, Horned (Utricularia cornuta)
- Bladderwort, Humped (Utricularia gibba)
- Blanket Flower, Showy (Gaillardia pulchella)
- Blazing Star, Cylindric (Liatris cylindracea)
- Blazing Star, Spiked (Liatris spicata)
- Bloodroot (Sanguinaria canadensis)
- Blue Curls (Trichostema dichotomum)
- Blue-eyed Grass, Common (Sisyrinchium montanum)
- Blue-eyed Grass, Slender (Sisyrinchium mucronatum)
- Blue-eyed Grass, Stout (Sisyrinchium angustifolium)
- Blue-eyed Grass, White (Sisyrinchium albidum)
- Bluebells, Northern (Mertensia paniculata)
- Blueberry, Velvetleaf (Vaccinium myrtilloides)
- Bluehearts (Buchnera americana)
- Boneset (Eupatorium perfoliatum)
- Bower, Virgin's (Clematis virginiana)
- Buckbean (Menyanthes trifoliata)
- Buckthorn, Alder-leaved (Rhamnus alnifolia)
- Buckthorn, Common (Rhamnus cathartica)
- Buckthorn, Glossy (Frangula alnus)
- Bunchberry (Cornus canadensis)
- Bur Reed, Floating (Sparganium fluctuans)
- Bur Reed, Lesser (Sparganium americanum)
- Burdock, Common (Arctium minus)
- Burnet, Small (Poterium sanguisorba)
- Bush Clover, Round-headed (Lespedeza capitata)
- Butter-and-eggs (Linaria vulgaris)
- Butterbur (Petasites japonicus)
- Buttercup, Hispid (Ranunculus hispidus)
- Buttercup, White Water (Ranunculus aquatilis)
- Butterwort (Pinguicula vulgaris)
- Buttonbush (Cephalanthus occidentalis)
- Cactus, Prickly Pear (Opuntia humifusa)
- Calamint, Low (Clinopodium arkansanum)
- Calypso (Calypso bulbosa)
- Campion, Bladder (Silene vulgaris)
- Campion, Red (Lychnis dioica)
- Campion, White (Silene latifolia)
- Cancerroot, One-flowered (Orobanche uniflora)
- Cancerwort, Roundleaf (Kickxia spuria)
- Cancerwort, Sharpleaf (Kickxia elatine)
- Cardinal Flower (Lobelia cardinalis)
- Carpenter's Square (Scrophularia marilandica)
- Carrion Flower (Smilax herbacea)
- Carrion Flower (Smilax lasioneura)
- Carrion Flower, Illinois (Smilax illinoensis)
- Carrot, Wild (Daucus carota)
- Catchfly, Night-flowering (Silene noctiflora)
- Catnip (Nepeta cataria)
- Cattail, Common (Typha latifolia)
- Cattail, Narrow-leaved (Typha angustifolia)
- Celandine (Chelidonium majus)
- Celandine, Lesser (Ficaria verna)
- Centaury (Centaurium erythraea)
- Centaury, Branching (Centaurium pulchellum)
- Chervil, Wild (Anthriscus sylvestris)
- Chickweed, Field (Cerastium arvense)
- Chickweed, Mouse-ear (Cerastium fontanum)
- Chicory (Cichorium intybus)
- Chives (Allium schoenoprasum)
- Chokeberry (Aronia melanocarpa)
- Chokecherry (Prunus virginiana)
- Cicely, Sweet (Osmorhiza claytonii)
- Cinquefoil, Common (Potentilla simplex)
- Cinquefoil, Shrubby (Dasiphora fruticosa)
- Cinquefoil, Tall (Drymocallis arguta)
- Cinquefoil, Three-toothed (Sibbaldia tridentata)
- Clammyweed (Polanisia dodecandra)
- Clearweed (Pilea pumila)
- Clintonia, Yellow (Clintonia borealis)
- Clover, Purple Prairie (Dalea purpurea)
- Coffee, Wild (Triosteum perfoliatum)
- Cohosh, Blue (Caulophyllum giganteum)
- Cohosh, Blue (Caulophyllum thalictroides)
- Colicroot (Aletris farinosa)
- Coltsfoot (Tussilago farfara)
- Coltsfoot, Sweet (Petasites frigidus)
- Columbine, Wild (Aquilegia canadensis)
- Columbo, American (Frasera caroliniensis)
- Compass Plant (Silphium laciniatum)
- Coneflower, Gray-headed (Ratibida pinnata)
- Coneflower, Green-headed (Rudbeckia laciniata)
- Coneflower, Pale Purple (Echinacea pallida)
- Coneflower, Purple (Echinacea purpurea)
- Coontail, Common (Ceratophyllum demersum)
- Coralroot, Early (Corallorhiza trifida)
- Coralroot, Spotted (Corallorhiza maculata)
- Coralroot, Striped (Corallorhiza striata)
- Coreopsis, Tall (Coreopsis tripteris)
- Corn, Squirrel (Dicentra canadensis)
- Corydalis, Golden (Corydalis aurea)
- Corydalis, Yellow (Corydalis flavula)
- Cowslip (Primula veris)
- Cowwheat (Melampyrum lineare)
- Cranberry, Large (Vaccinium macrocarpon)
- Cranberry, Small (Vaccinium oxycoccos)
- Cranesbill, Bicknell's (Geranium bicknellii)
- Creeper, Trumpet (Campsis radicans)
- Creeper, Virginia (Parthenocissus quinquefolia)
- Cress, Hairy Bitter (Cardamine hirsuta)
- Cress, Hairy Rock (Arabis hirsuta)
- Cress, Lyre-leaved Rock (Arabidopsis lyrata)
- Cress, Mouse Ear (Arabidopsis thaliana)
- Cress, Purple (Cardamine douglassii)
- Cress, Smooth Rock (Borodinia laevigata)
- Cress, Spring (Cardamine bulbosa)
- Crocus (Crocus vernus)
- Crowfoot, Bristly (Ranunculus pensylvanicus)
- Crowfoot, Cursed (Ranunculus sceleratus)
- Crowfoot, Hooked (Ranunculus recurvatus)
- Crowfoot, Small Yellow Water (Ranunculus gmelinii)
- Crowfoot, Small-flowered (Ranunculus abortivus)
- Cuckooflower (Cardamine pratensis)
- Cucumber Root, Indian (Medeola virginiana)
- Cucumber, One-seeded Bur (Sicyos angulatus)
- Cucumber, Wild (Echinocystis lobata)
- Culver's Root (Veronicastrum virginicum)
- Currant, Wild Black (Ribes americanum)
- Daffodil (Narcissus pseudonarcissus)
- Daisy, English (Bellis perennis)
- Daisy, Lakeside (Tetraneuris herbacea)
- Daisy, Oxeye (Leucanthemum vulgare)
- Dandelion, Common (Taraxacum officinale)
- Devil's Bit (Chamaelirium luteum)
- Dock, Greater Water (Rumex britannica)
- Dock, Prairie (Silphium terebinthinaceum)
- Dogwood, Flowering (Cornus florida)
- Dogwood, Red Osier (Cornus stolonifera)
- Duckweed, Lesser (Lemna minor)
- Dutchman's Breeches (Dicentra cucullaria)
- Elecampane (Inula helenium)
- Foamflower (Tiarella cordifolia)
- Frogbit (Hydrocharis morsus-ranae)
- Gentian, Narrow-leaved (Gentiana linearis)
- Gentian, Orange-fruited Horse (Triosteum aurantiacum)
- Gentian, Smaller Fringed (Gentianopsis virgata)
- Gentian, Spurred (Halenia deflexa)
- Geranium, Wild (Geranium maculatum)
- Ginger, Wild (Asarum canadense)
- Ginseng (Panax quinquefolius)
- Ginseng, Dwarf (Panax trifolius)
- Goldenrod, Blue-stemmed (Solidago caesia)
- Goldenrod, Bog (Solidago uliginosa)
- Goldenrod, Canada (Solidago canadensis)
- Goldenrod, Early (Solidago juncea)
- Goldenrod, Grass-leaved (Euthamia graminifolia)
- Goldenrod, Gray (Solidago nemoralis)
- Goldenrod, Hairy (Solidago hispida)
- Goldenrod, Houghton's (Solidago houghtonii)
- Goldenrod, Late (Solidago gigantea)
- Goldenrod, Ohio (Solidago ohioensis)
- Goldenrod, Rough-leaved (Solidago patula)
- Goldenrod, Rough-stemmed (Solidago rugosa)
- Goldenrod, Seaside (Solidago sempervirens)
- Goldenrod, Sharp-leaved (Solidago arguta)
- Goldenrod, Showy (Solidago speciosa)
- Goldenrod, Stiff-leaved (Solidago rigida)
- Goldenrod, Stout (Solidago squarrosa)
- Goldenrod, Tall (Solidago altissima)
- Goldenrod, Zigzag (Solidago flexicaulis)
- Goldenseal (Hydrastis canadensis)
- Goldthread (Coptis trifolia)
- Gooseberry, Prickly (Ribes cynosbati)
- Gooseberry, Wild (Ribes hirtellum)
- Grass Pink (Calopogon tuberosus)
- Grass-of-Parnassus (Parnassia glauca)
- Green Dragon (Arisaema dracontium)
- Ground Cherry, Clammy (Physalis heterophylla)
- Ground Cherry, Smooth (Physalis longifolia)
- Harbinger-of-Spring (Erigenia bulbosa)
- Harebell (Campanula rotundifolia)
- Hazel, Witch (Hamamelis virginiana)
- Heather, False (Hudsonia tomentosa)
- Hedge Parsley, Japanese (Torilis japonica)
- Helleborine (Epipactis helleborine)
- Hemlock, Bulb-bearing Water (Cicuta bulbifera)
- Hemlock, Poison (Conium maculatum)
- Hemlock, Water (Cicuta maculata)
- Hepatica, Round-lobed (Anemone americana)
- Hepatica, Sharp-lobed (Anemone acutiloba)
- Herb Robert (Geranium robertianum)
- Himalayan Balsam (Impatiens glandulifera)
- Hobblebush (Viburnum lantanoides)
- Holly, Mountain (Ilex mucronata)
- Honewort (Cryptotaenia canadensis)
- Honeysuckle, American Fly (Lonicera canadensis)
- Horsemint (Monarda punctata)
- Hound's Tongue (Cynoglossum officinale)
- Hyacinth, Grape (Muscari botryoides)
- Hyssop, Yellow Giant (Agastache nepetoides)
- Indian Paintbrush (Castilleja coccinea)
- Indian Pipe (Monotropa uniflora)
- Indigo, False (Amorpha fruticosa)
- Iris, Blue Flag (Iris versicolor)
- Iris, Dwarf Lake (Iris lacustris)
- Iris, Yellow (Iris pseudacorus)
- Ironweed, Tall (Vernonia gigantea)
- Ivy, Ground (Glechoma hederacea)
- Ivy, Poison (Toxicodendron rydbergii)
- Jack-in-the-Pulpit (Arisaema triphyllum)
- Joe Pye Weed, Spotted (Eutrochium maculatum)
- Joe Pye Weed, Sweet-scented (Eutrochium purpureum)
- Jointweed, Northern (Polygonum articulatum)
- Jumpseed (Persicaria virginiana)
- Knotweed, Japanese (Fallopia japonica)
- Ladies' Tresses, Great Plains (Spiranthes magnicamporum)
- Ladies' Tresses, Hooded (Spiranthes romanzoffiana)
- Ladies' Tresses, Nodding (Spiranthes cernua)
- Ladies' Tresses, Northern Slender (Spiranthes lacera)
- Ladies' Tresses, Wide-leaved (Spiranthes lucida)
- Lady's Slipper, Hybrid (Cypripedium parviflorum X C. candidum)
- Lady's Slipper, Large Yellow (Cypripedium parviflorum var pubescens)
- Lady's Slipper, Pink (Cypripedium acaule)
- Lady's Slipper, Ram's Head (Cypripedium arietinum)
- Lady's Slipper, Showy (Cypripedium reginae)
- Lady's Slipper, Small White (Cypripedium candidum)
- Lady's Slipper, Small Yellow (Cypripedium parviflorum var makasin)
- Lamb's Quarters (Chenopodium album)
- Leatherleaf (Chamaedaphne calyculata)
- Leatherwood (Dirca palustris)
- Leek, Wild (Allium tricoccum)
- Lettuce, White (Nabalus albus)
- Lilac, Common (Syringa vulgaris)
- Lily, Michigan (Lilium michiganense)
- Lily, Trout (Erythronium americanum)
- Lily, White Trout (Erythronium albidum)
- Lily, Wood (Lilium philadelphicum)
- Lizard's Tail (Saururus cernuus)
- Lobelia, Great (Lobelia siphilitica)
- Looking-glass, Venus's (Triodanis perfoliata)
- Loosestrife, Fringed (Lysimachia ciliata)
- Loosestrife, Prairie (Lysimachia quadriflora)
- Loosestrife, Purple (Lythrum salicaria)
- Loosestrife, Swamp (Decodon verticillatus)
- Loosestrife, Tufted (Lysimachia thyrsiflora)
- Loosestrife, Whorled (Lysimachia quadrifolia)
- Loosestrife, Yellow (Lysimachia terrestris)
- Lopseed (Phryma leptostachya)
- Lungwort, Sea (Mertensia maritima)
- Lupine, Wild (Lupinus perennis)
- Mandarin, Yellow (Prosartes lanuginosa)
- Marigold, Marsh (Caltha palustris)
- Marigold, Water (Bidens beckii)
- Mayapple (Podophyllum peltatum)
- Mayflower, Canada (Maianthemum canadense)
- Meadow Beauty (Rhexia virginica)
- Meadow Rue, Early (Thalictrum dioicum)
- Medick, Black (Medicago lupulina)
- Mermaid, False (Floerkea proserpinacoides)
- Mignonette, Yellow Upright (Reseda lutea)
- Milkvetch, Canada (Astragalus canadensis)
- Milkweed, Butterfly (Asclepias tuberosa)
- Milkweed, Common (Asclepias syriaca)
- Milkweed, Poke (Asclepias exaltata)
- Milkweed, Purple (Asclepias purpurascens)
- Milkweed, Swamp (Asclepias incarnata)
- Milkweed, Whorled (Asclepias verticillata)
- Mint, Downy Wood (Blephilia ciliata)
- Miterwort (Mitella diphylla)
- Miterwort, Naked (Mitella nuda)
- Monkey Flower, Square-stemmed (Mimulus ringens)
- Mountain Avens, White (Dryas integrifolia)
- Mountain Mint, Hairy (Pycnanthemum verticillatum)
- Mountain Mint, Virginia (Pycnanthemum virginianum)
- Mullein, Common (Verbascum thapsus)
- Mullein, Dark (Verbascum nigrum)
- Mullein, Moth (Verbascum blattaria)
- Mustard, Garlic (Alliaria petiolata)
- Nannyberry (Viburnum lentago)
- Nightshade, Enchanter's (Circaea canadensis)
- Nipplewort (Lapsana communis)
- Onion, Nodding Wild (Allium cernuum)
- Orchid, Alaska (Platanthera unalascensis)
- Orchid, Blunt Leaf Rein (Platanthera obtusata)
- Orchid, Club Spur (Platanthera clavellata)
- Orchid, Hooker's (Platanthera hookeri)
- Orchid, Large Round Leaf (Platanthera macrophylla)
- Orchid, Long-bracted Green (Dactylorhiza viridis)
- Orchid, Northern Green (Platanthera hyperborea)
- Orchid, Prairie White Fringed (Platanthera leucophaea)
- Orchid, Ragged Fringed (Platanthera lacera)
- Orchid, Round Leaf (Platanthera orbiculata)
- Orchid, Small Round-leaved (Galearis rotundifolia)
- Orchid, Smaller Purple Fringed (Platanthera psycodes)
- Orchid, White Bog (Platanthera dilatata)
- Orchid, White Fringed (Platanthera blephariglottis)
- Orchis, Showy (Galearis spectabilis)
- Oxeye (Heliopsis helianthoides)
- Pansy, Field (Viola bicolor)
- Parsnip, Water (Sium suave)
- Pea, Beach (Lathyrus japonicus)
- Pennyroyal, False (Trichostema brachiatum)
- Periwinkle (Vinca minor)
- Pickerelweed (Pontederia cordata)
- Pimpernel, Yellow (Taenidia integerrima)
- Pinesap (Hypopitys monotropa)
- Pinweed, Hairy (Lechea mucronata)
- Pipsissewa (Chimaphila umbellata)
- Plantain, Robin's (Erigeron pulchellus)
- Pogonia, Rose (Pogonia ophioglossoides)
- Pokeweed (Phytolacca americana)
- Polygala, Fringed (Polygaloides paucifolia)
- Poppy, Celandine (Stylophorum diphyllum)
- Prairie Smoke (Geum triflorum)
- Prickly Ash (Zanthoxylum americanum)
- Primrose, Dwarf Canadian (Primula mistassinica)
- Puccoon, Fringed (Lithospermum incisum)
- Puccoon, Hairy (Lithospermum caroliniense)
- Purslane (Portulaca oleracea)
- Purslane, Milk (Euphorbia maculata)
- Pussytoes, Field (Antennaria neglecta)
- Pussytoes, Parlin's (Antennaria parlinii)
- Pyrola, Green-flowered (Pyrola chlorantha)
- Pyrola, One-Flowered (Moneses uniflora)
- Pyrola, One-sided (Orthilia secunda)
- Ragged Robin (Silene flos-cuculi)
- Ragwort, Prairie (Packera plattensis)
- Raisin, Wild (Viburnum nudum)
- Rattlesnake Plantain, Downy (Goodyera pubescens)
- Rattlesnake Plantain, Dwarf (Goodyera repens)
- Rattlesnake Plantain, Green-leaved (Goodyera oblongifolia)
- Rattlesnakeroot, Glaucous (Nabalus racemosus)
- Rattlesnakeroot, Tall (Nabalus altissimus)
- Rattlesnakeroot, Three-leaved (Nabalus trifoliolatus)
- Redbud (Cercis canadensis)
- Rhubarb (Rheum rhabarbarum)
- River Beauty (Chamerion latifolium)
- Rocket, Dame's (Hesperis matronalis)
- Rocket, Yellow (Barbarea vulgaris)
- Saltwort, Common (Salsola tragus)
- Sandwort, Rock (Sabulina michauxii)
- Sandwort, Thyme-leaved (Arenaria serpyllifolia)
- Saxifrage, Early (Micranthes virginiensis)
- Saxifrage, Golden (Chrysosplenium americanum)
- Scheuchzeria (Scheuchzeria palustris)
- Scilla (Scilla siberica)
- Senna, Wild (Senna hebecarpa)
- Shepherd's Purse (Capsella bursa-pastoris)
- Shinleaf (Pyrola elliptica)
- Silverrod (Solidago bicolor)
- Silverweed (Potentilla anserina)
- Skunk Cabbage (Symplocarpus foetidus)
- Snakeroot, Seneca (Polygala senega)
- Snapdragon, Dwarf (Chaenorrhinum minus)
- Sneezeweed (Helenium autumnale)
- Snow in Summer (Cerastium tomentosum)
- Snowberry, Creeping (Gaultheria hispidula)
- Snowdrops (Galanthus nivalis)
- Solomon's Seal, False (Maianthemum racemosum)
- Solomon's Seal, Great (Polygonatum canaliculatum)
- Solomon's Seal, Hairy (Polygonatum pubescens)
- Solomon's Seal, Star-flowered (Maianthemum stellatum)
- Sorrel, Common Wood (Oxalis montana)
- Speedwell, Bird's-eye (Veronica chamaedrys)
- Speedwell, Common (Veronica officinalis)
- Speedwell, Marsh (Veronica scutellata)
- Speedwell, Persian (Veronica persica)
- Speedwell, Slender (Veronica filiformis)
- Speedwell, Thyme-leaved (Veronica serpyllifolia)
- Speedwell, Water (Veronica anagallis-aquatica)
- Spicebush (Lindera benzoin)
- Spirea, False (Sorbaria sorbifolia)
- Spring Beauty, Carolina (Claytonia caroliniana)
- Spring Beauty, Narrow-leaved (Claytonia virginica)
- Spurge, Cypress (Euphorbia cyparissias)
- Spurge, Flowering (Euphorbia corollata)
- Squawroot (Conopholis americana)
- Star-of-Bethlehem (Ornithogalum umbellatum)
- Starflower (Lysimachia borealis)
- Stargrass, Yellow (Hypoxis hirsuta)
- Starwort, Hermaphrodite Water (Callitriche hermaphroditica)
- Stonecrop, Mossy (Sedum acre)
- Strawberry, Barren (Geum fragarioides)
- Strawberry, Indian (Potentilla indica)
- Strawberry, Wild (Fragaria virginiana)
- Strawberry, Woodland (Fragaria vesca)
- Sumac, Fragrant (Rhus aromatica)
- Sumac, Poison (Toxicodendron vernix)
- Sundew, Linear-leaved (Drosera linearis)
- Sundew, Round-leaved (Drosera rotundifolia)
- Sundew, Spatulate-leaved (Drosera intermedia)
- Sunflower, Maximilian (Helianthus maximilianii)
- Sunflower, Tall (Helianthus giganteus)
- Sunflower, Woodland (Helianthus divaricatus)
- Swallowwort, Black (Cynanchum louiseae)
- Swallowwort, Pale (Cynanchum rossicum)
- Swallowwort, White (Cynanchum vincetoxicum)
- Sweetflag (Acorus calamus)
- Tansy (Tanacetum vulgare)
- Tea, Oswego (Monarda didyma)
- Tearthumb, Arrow-leaved (Persicaria sagittata)
- Tearthumb, Halberd-leaved (Persicaria arifolia)
- Teasel (Dipsacus fullonum)
- Thimbleweed (Anemone virginiana)
- Thistle, Bull (Cirsium vulgare)
- Thistle, Canada (Cirsium arvense)
- Thistle, Field (Cirsium discolor)
- Thistle, Globe (Echinops sphaerocephalus)
- Thistle, Hill's (Cirsium pumilum)
- Thistle, Nodding (Carduus nutans)
- Thistle, Pitcher's (Cirsium pitcheri)
- Tick Trefoil, Showy (Desmodium canadense)
- Toadflax, Dalmation (Linaria dalmatica)
- Tobacco, Indian (Lobelia inflata)
- Tofieldia, Sticky (Triantha glutinosa)
- Touch-me-not, Pale (Impatiens pallida)
- Trefoil, Birdsfoot (Lotus corniculatus)
- Trillium, Nodding (Trillium cernuum)
- Trillium, Painted (Trillium undulatum)
- Trillium, Red (Trillium erectum)
- Trillium, White (Trillium grandiflorum)
- Trillium, Yellow (Trillium luteum)
- Tulip (Tulipa sylvestris)
- Turtlehead (Chelone glabra)
- Twayblade, Auricled (Neottia auriculata)
- Twayblade, European Common (Neottia ovata)
- Twayblade, Heart-leaved (Neottia cordata)
- Twayblade, Loesel's (Liparis loeselii)
- Twayblade, Purple (Liparis liliifolia)
- Twinflower (Linnaea borealis)
- Twinleaf (Jeffersonia diphylla)
- Twisted Stalk, Rose (Streptopus lanceolatus)
- Velvetleaf (Abutilon theophrasti)
- Vervain, Blue (Verbena hastata)
- Vervain, Hoary (Verbena stricta)
- Vetchling, Marsh (Lathyrus palustris)
- Vetchling, Pale (Lathyrus ochroleucus)
- Vetchling, Tuberous (Lathyrus tuberosus)
- Vetchling, Yellow (Lathyrus pratensis)
- Violet, Arrow-leaved (Viola sagittata)
- Violet, Birdfoot (Viola pedata)
- Violet, Canada (Viola canadensis)
- Violet, Common Blue (Viola papilionacea)
- Violet, Dog (Viola conspersa)
- Violet, Downy Yellow (Viola pubescens)
- Violet, Green (Hybanthus concolor)
- Violet, Kidney-leaved (Viola renifolia)
- Violet, Labrador (Viola labradorica)
- Violet, Long-spurred (Viola rostrata)
- Violet, Marsh Blue (Viola cucullata)
- Violet, Northern Bog (Viola nephrophylla)
- Violet, Northern White (Viola macloskeyi)
- Violet, Pale (Viola striata)
- Violet, Palmate (Viola palmata)
- Violet, Round-leaved (Viola rotundifolia)
- Violet, Sand (Viola adunca)
- Violet, Sweet White (Viola blanda)
- Violet, Woolly Blue (Viola sororia)
- Viper's Bugloss (Echium vulgare)
- Water Shield (Brasenia schreberi)
- Waterleaf, Broad-leaved (Hydrophyllum canadense)
- Waterleaf, Virginia (Hydrophyllum virginianum)
- Whitlow Grass, Carolina (Draba reptans)
- Whitlow Grass, Spring (Draba verna)
- Winterberry (Ilex verticillata)
- Wintergreen (Gaultheria procumbens)
- Woodruff, Sweet (Galium odoratum)
- Yarrow (Achillea millefolium)
- Yucca (Yucca filamentosa)
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