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Number of results: 351
| Scientific Name | Common Name(s) |
|---|---|
| Achillea millefolium | Common Yarrow |
| Actaea rubra | Red Baneberry |
| Agastache foeniculum | Blue Giant Hyssop, Lavender Hyssop, Anise Hyssop |
| Agastache scrophulariifolia | Purple Giant Hyssop |
| Ageratina altissima | White Snakeroot |
| Agrimonia gryposepala | Tall Hairy Agrimony, Common Agrimony |
| Alisma triviale | Northern Water Plantain, Large-flowered Water Plantain |
| Alliaria petiolata | Garlic Mustard |
| Allium stellatum | Prairie Onion, Autumn Onion, Pink Wild Onion, Prairie Wild Onion |
| Ambrosia artemisiifolia | Common Ragweed, Annual Ragweed |
| Ambrosia trifida | Giant Ragweed, Great Ragweed, Horseweed |
| Amerorchis rotundifolia | Small Round-leaved Orchid, Round-leaved Orchis |
| Amorpha canescens | Lead Plant, Shoestrings |
| Amorpha fruticosa | False Indigo, Desert False Indigo, Bastard Indigo |
| Amphicarpaea bracteata | American Hog Peanut |
| Anemone canadensis | Canada Anemone |
| Anemone cylindrica | Thimbleweed, Long-fruited Thimbleweed, Long-headed Anemone, Candle Anemone, Cottenweed |
| Anemone quinquefolia | Wood Anemone, Nightcaps |
| Anemone virginiana | Tall Thimbleweed, Virginia Anemone |
| Antennaria neglecta | Field Pussytoes |
| Antennaria plantaginifolia | Plantain-leaved Pussytoes, Woman's Tobacco, Plain-leaf Pussytoes |
| Apios americana | Groundnut, American Potato-bean, Indian Potato |
| Aplectrum hyemale | Putty-root, Adam and Eve |
| Apocynum androsaemifolium | Spreading Dogbane |
| Apocynum cannabinum | Indian Hemp, Prairie Dogbane |
| Aquilegia canadensis | Red Columbine, Wild Columbine |
| Arabis divaricarpa | Spreading-pod Rock Cress, Purple Rockcress |
| Aralia nudicaulis | Wild Sarsaparilla |
| Arctostaphylos uva-ursi | Bearberry, Kinnikinnick |
| Arethusa bulbosa | Dragon's Mouth, Swamp Pink |
| Argentina anserina | Silverweed Cinquefoil, Silver-weed |
| Arisaema triphyllum | Jack-in-the-Pulpit, Indian Turnip |
| Artemisia absinthium | Absinthium, Absinth Wormwood |
| Artemisia campestris | Field Sagewort, Western Sagewort, Tall Wormwood |
| Artemisia ludoviciana | White Sage, White Sagebrush, Prairie Sage, Western Mugwort |
| Asarum canadense | Canadian Wild Ginger |
| Asclepias exaltata | Poke Milkweed, Tall Milkweed |
| Asclepias incarnata | Swamp Milkweed, Swamp Silkweed |
| Asclepias lanuginosa | Woolly Milkweed, Side-cluster Milkweed |
| Asclepias ovalifolia | Oval-leaf Milkweed, Dwarf Milkweed |
| Asclepias purpurascens | Purple Milkweed |
| Asclepias speciosa | Showy Milkweed |
| Asclepias sullivantii | Sullivant's Milkweed, Smooth Milkweed, Prairie Milkweed |
| Asclepias syriaca | Common Milkweed, Silkweed, Milkplant |
| Asclepias tuberosa | Butterfly-weed, Butterfly Milkweed |
| Asclepias verticillata | Whorled Milkweed |
| Asclepias viridiflora | Green Milkweed, Green Comet Milkweed |
| Asparagus officinalis | Garden Asparagus, Common Asparagus |
| Astragalus canadensis | Canada Milkvetch |
| Barbarea vulgaris | Garden Yellow Rocket, Winter Cress, Yellow-rocket |
| Berteroa incana | Hoary Alyssum, Hoary False Madwort |
| Besseya bullii | Kittentails, Bull's Coraldrops |
| Bidens cernua | Nodding Bur-Marigold, Nodding Beggarticks |
| Bidens coronata | Crowned Beggarticks, Northern Tickseed-sunflower, Tall Tickseed-sunflower, Tall Swamp Marigold |
| Boehmeria cylindrica | Small-spike False Nettle |
| Calopogon tuberosus | Tuberous Grass-pink |
| Caltha palustris | Marsh Marigold |
| Calypso bulbosa var. americana | Fairy Slipper, Calypso Orchid |
| Calystegia sepium | Hedge Bindweed, Hedge False Bindweed |
| Campanula rapunculoides | Creeping Bellflower, Rampion Bellflower, European Bellflower |
| Campanula rotundifolia | Harebell, Bluebell Bellflower, Bluebells of Scotland |
| Campanulastrum americanum | American Bellflower, Tall Bellflower |
| Cannabis sativa | Hemp, Ditchweed |
| Capsella bursa-pastoris | Shepherd's Purse |
| Carduus acanthoides | Plumeless Thistle, Spiny Plumeless Thistle |
| Carduus nutans | Nodding Thistle, Nodding Plumeless Thistle, Musk Thistle |
| Caulophyllum thalictroides | Blue Cohosh, Pappoose-root, Squaw-root |
| Ceanothus americanus | New Jersey Tea, Redroot, Wild Snowball |
| Centaurea biebersteinii | Spotted Knapweed |
| Chelone glabra | White Turtlehead |
| Cicuta bulbifera | Bulblet-bearing Water Hemlock |
| Cicuta maculata | Water Hemlock, Spotted Water Hemlock, Spotted Cowbane |
| Circaea lutetiana | Enchanter's Nightshade, Broadleaf Enchanter's Nightshade |
| Cirsium arvense | Canada Thistle, Field Thistle |
| Cirsium discolor | Pasture Thistle, Field Thistle |
| Cirsium flodmanii | Flodman's Thistle, Hollow-root Thistle, Prairie Thistle |
| Cirsium hillii | Hill's Thistle, Hollow-root Thistle |
| Cirsium muticum | Swamp Thistle |
| Cirsium vulgare | Bull Thistle |
| Claytonia caroliniana | Carolina Spring Beauty, Northern Spring Beauty |
| Claytonia virginica | Virginia Spring Beauty |
| Clintonia borealis | Bluebead, Yellow Bluebead Lily, Yellow Clintonia, Corn Lily |
| Comandra umbellata | Bastard Toadflax |
| Commelina communis | Asiatic Dayflower |
| Conium maculatum | Poison Hemlock |
| Convallaria majalis | European Lily-of-the-valley |
| Convolvulus arvensis | Field Bindweed |
| Conyza canadensis | Canadian Horseweed, Canada Fleabane |
| Coptis trifolia | Three-leaf Goldthread |
| Corallorhiza maculata | Spotted Coralroot, Summer Coralroot |
| Corallorhiza odontorhiza | Autumn Coralroot, Late Coralroot |
| Corallorhiza striata | Striped Coralroot, Hooded Coralroot |
| Corallorhiza trifida | Early Coralroot, Spring Coralroot, Yellow Coralroot, Northern Coralroot |
| Coreopsis palmata | Prairie Coreopsis, Stiff Tickseed, Finger Coreopsis |
| Coronilla varia | Crown Vetch, Purple Crownvetch |
| Crepis tectorum | Narrow-leaf Hawksbeard |
| Cryptotaenia canadensis | Canadian Honewort |
| Cynoglossum officinale | Gypsy Flower, Hound's-tongue |
| Cypripedium acaule | Stemless Lady's-slipper, Pink Moccasin-flower, Small Pink Lady's-slipper |
| Cypripedium arietinum | Ram's-head Lady's-slipper, Ram's-head Moccasin Flower |
| Cypripedium candidum | Small White Lady's-slipper, White Moccasin-flower |
| Cypripedium parviflorum var. makasin | Small Yellow Lady's-slipper, Lesser Yellow Lady's-slipper |
| Cypripedium parviflorum var. pubescens | Greater Yellow Lady's-slipper, Large Yellow Lady's Slipper |
| Cypripedium reginae | Showy Lady's-slipper |
| Dalea candida | White Prairie Clover |
| Dalea purpurea | Purple Prairie Clover |
| Dalea villosa | Silky Prairie Clover, Downy Prairie Clover |
| Delphinium carolinianum | Carolina Larkspur, Prairie Larkspur |
| Desmodium canadense | Showy Tick-trefoil, Hoary Tick-trefoil, Canada Tick-clover |
| Desmodium glutinosum | Pointed-leaf Tick-trefoil, Large-flower tickclover |
| Dicentra cucullaria | Dutchman's Breeches |
| Doellingeria umbellata | Flat-topped White Aster, Flat-top Aster, Parasol Whitetop |
| Dracocephalum parviflorum | American Dragonhead |
| Echinocystis lobata | Wild Cucumber |
| Ellisia nyctelea | Aunt Lucy, Waterpod |
| Enemion biternatum | False Rue Anemone |
| Erigeron philadelphicus | Philadelphia Fleabane, Common Fleabane |
| Erysimum cheiranthoides | Wormseed Wallflower, Worm-seed Mustard |
| Erythronium albidum | White Trout Lily, White Fawn Lily, White Dog-tooth Violet, White Adder's Tongue |
| Erythronium americanum | Yellow Trout Lily, Yellow Adder's-tongue, Dogtooth Violet |
| Erythronium propullans | Dwarf Trout Lily, Minnesota Dwarf Trout Lily, Minnesota Fawnlily, Minnesota Adder's-tongue |
| Eupatoriadelphus maculatus | Spotted Joe-pye Weed, Purple Boneset, Spotted Trumpetweed |
| Eupatorium altissimum | Tall Boneset, Tall Thoroughwort |
| Eupatorium perfoliatum | Common Boneset |
| Euphorbia corollata | Flowering Spurge |
| Euphorbia esula | Leafy Spurge |
| Eurybia macrophylla | Large-leaved Aster, Big-leaf Aster |
| Fallopia japonica (Polygonum cuspidatum) | Japanese Knotweed, Mexican Bamboo, Hancock's Curse |
| Galearis spectabilis | Showy Orchis, Showy Orchid |
| Galeopsis tetrahit | Brittlestem Hemp-nettle, Common Hemp-nettle |
| Galinsoga quadriradiata | Shaggy Soldier, Quick Weed, Peruvian Daisy |
| Galium aparine | Sticky-willy, Cleavers, Catchweed Bedstraw, Goose-grass |
| Galium boreale | Northern Bedstraw |
| Gentiana andrewsii | Bottle Gentian, Closed Bottle Gentian, Andrew's Gentian, Prairie Gentian |
| Geranium maculatum | Wild Geranium, Spotted Geranium, Spotted Cranebill, Wild Cranebill Alumroot |
| Geum aleppicum | Yellow Avens |
| Geum canadense | White Avens |
| Geum macrophyllum | Large-leaf Avens |
| Geum triflorum | Prairie Smoke, Old Man's Whiskers |
| Glechoma hederacea | Ground Ivy, Creeping Charlie, Gill-over-the-Ground |
| Glycyrrhiza lepidota | Wild Licorice, American Licorice |
| Goodyera pubescens | Downy Rattlesnake Plantain |
| Goodyera repens | Lesser Rattlesnake Plantain, Dwarf Rattlesnake Plantain |
| Goodyera tesselata | Tesselated Rattlesnake Plantain, Checkered Rattlesnake Plantain |
| Grindelia squarrosa | Gumweed, Curlycup Gumweed, Curly-top Gumweed |
| Hedeoma hispida | Rough False Pennyroyal, Mock Pennyroyal |
| Helenium autumnale | Sneezeweed, Common Sneezeweed, Sneezewort, Swamp Sunflower |
| Helianthus giganteus | Giant Sunflower, Tall Sunflower, Swamp Sunflower |
| Helianthus grosseserratus | Sawtooth Sunflower |
| Helianthus hirsutus | Hairy Sunflower, Hispid Sunflower, Stiff-haired Sunflower |
| Helianthus maximilianii | Maximilian Sunflower |
| Helianthus occidentalis | Few-leaf Sunflower, Naked-stem Sunflower, Western Sunflower |
| Helianthus pauciflorus | Stiff Sunflower, Prairie Sunflower, Few-leaved Sunflower |
| Helianthus petiolaris | Prairie Sunflower, Plains Sunflower |
| Helianthus tuberosus | Jerusalem Artichoke |
| Heliopsis helianthoides | Smooth Oxeye, Common Ox-eye, False Sunflower, Sunflower Heliopsis |
| Hemerocallis fulva | Day Lily, Orange Daylily |
| Hepatica nobilis | Hepatica, Sharp-lobed Hepatica, Round-lobed Hepatica, Liverwort |
| Heracleum maximum | Common Cow Parsnip, American Cow-parsnip |
| Hesperis matronalis | Dame's Rocket |
| Heterotheca villosa | Hairy False Goldenaster, Hairy Golden-aster |
| Heuchera richardsonii | Prairie Alumroot, Richardson's Alumroot |
| Hibiscus laevis | Halberd-leaved Rose Mallow, Smooth Rose Mallow |
| Hibiscus trionum | Flower of an Hour |
| Hieracium aurantiacum | Orange Hawkweed, Devil's Paintbrush |
| Hieracium longipilum | Hairy Hawkweed, Long-bearded Hawkweed |
| Houstonia longifolia | Long-leaf Bluets, Long-leaf Houstonia, Long-leaf Summer Bluet |
| Hydrophyllum virginianum | Virginia Waterleaf, Eastern Waterleaf |
| Hypericum ascyron | Great St. Johnswort, Giant St. John's-wort |
| Hypericum perforatum | Common St. Johnswort |
| Impatiens capensis | Spotted Touch-me-not, Jewelweed |
| Impatiens pallida | Pale Touch-me-not, Yellow Jewelweed, Yellow Touch-me-not |
| Iris pseudacorus | Pale-yellow Iris, Yellow Flag |
| Iris versicolor | Harlequin Blueflag, Blueflag Iris |
| Lactuca biennis | Tall Blue Lettuce, Blue Wood Lettuce |
| Lactuca canadensis | Wild Lettuce, Canadian Lettuce |
| Laportea canadensis | Canadian Wood Nettle |
| Lathyrus ochroleucus | Cream Pea, Pale Pea, Cream Peavine, Pale Vetchling |
| Lathyrus palustris | Marsh Vetchling, Marsh Pea, Wild Pea |
| Leonurus cardiaca | Motherwort |
| Lespedeza capitata | Round-headed Bush Clover, Rabbit foot, Roundhead Lespedeza |
| Leucanthemum vulgare | Ox-eye Daisy, Common Daisy, Marguerite |
| Liatris aspera | Rough Blazing Star, Tall Blazing Star, Gayfeather |
| Liatris punctata | Dotted Blazing Star, Dotted Gayfeather, Narrow-leaved Blazing Star |
| Liatris pycnostachya | Prairie Blazing Star, Cat-tail Gayfeather, Thick-spike Gayfeather, Tall Blazing Star |
| Lilium michiganense | Michigan Lily |
| Linaria dalmatica | Dalmatian Toadflax |
| Linaria vulgaris | Butter and Eggs, Yellow Toadflax |
| Liparis liliifolia | Lily-leaved Twayblade, Brown Widelip Orchid, Large Twayblade, Purple Twayblade, Mauve Sleekwort |
| Liparis loeselii | Loesel's Twayblade, Yellow Widelip Orchid, Bog Twayblade, Fen Orchid |
| Listera cordata | Heart-leaved Twayblade |
| Lithospermum canescens | Hoary Puccoon |
| Lithospermum caroliniense | Carolina Puccoon, Hairy Puccoon, Carolina Gromwell |
| Lithospermum incisum | Narrow-leaf Puccoon, Narrowleaf Stoneseed, Fringed Puccoon, Yellow Puccoon, Narrow-leaf Gromwell |
| Lobelia cardinalis | Cardinal Flower |
| Lobelia siphilitica | Blue Lobelia, Great Blue Lobelia, Blue Cardinal Flower |
| Lobelia spicata | Pale-spike Lobelia |
| Lotus corniculatus | Birds-foot Trefoil, Birdfoot Deervetch |
| Lotus unifoliolatus | American Bird's-foot Trefoil, Prairie Trefoil |
| Lupinus perennis | Wild Lupine, Sundial Lupine |
| Lycopus americanus | American Water Horehound, American Bugleweed |
| Lycopus uniflorus | Northern Bugleweed |
| Lysimachia ciliata | Fringed Loosestrife |
| Lysimachia terrestris | Swamp Candles, Swamp Loosestrife, Earth Loosestrife |
| Lysimachia thyrsiflora | Tufted Loosestrife, Water Loosestrife |
| Lythrum salicaria | Purple Loosestrife |
| Maianthemum canadense | Canada Mayflower, Wild Lily-of-the-valley, False Lily-of-the-valley |
| Maianthemum racemosum | False Solomon's Seal, Solomon's Plume, Feathery False Lily-of-the-Valley |
| Maianthemum stellatum | Starry Solomon's Plume, Starry False Solomon's Seal, Starry False Lily-of-the-Valley |
| Malaxis unifolia | Green Adder's-mouth |
| Matricaria discoidea | Pineapple-weed, Disc Mayweed |
| Medicago lupulina | Black Medick |
| Medicago sativa | Alfalfa |
| Melilotus officinalis | Yellow Sweet Clover, White Sweet Clover |
| Mentha arvensis | Wild Mint, Field Mint |
| Mimulus glabratus | Round-leaf Monkey Flower |
| Mimulus ringens | Allegheny Monkey Flower |
| Mirabilis hirsuta | Hairy Four O'clock |
| Mirabilis nyctaginea | Wild Four O'Clock, Heart-leaf Four O'Clock |
| Mitella diphylla | Two-leaf Miterwort, Bishop's Cap |
| Moehringia lateriflora | Bluntleaf Sandwort, Grove Sandwort |
| Monarda fistulosa | Wild Bergamot, Horsemint, Bee Balm |
| Monotropa hypopithys | Pinesap, False Beech Drops |
| Monotropa uniflora | Indian Pipe |
| Myosoton aquaticum | Giant Chickweed |
| Nepeta cataria | Catnip, Cat mint |
| Nuttallanthus canadensis | Canada Toadflax, Oldfield Toadflax, Blue Toadflax |
| Oenothera biennis | Common Evening Primrose |
| Oenothera nuttallii | Nuttall's Evening Primrose, White-stemmed Evening Primrose |
| Oenothera rhombipetala | Fourpoint Evening Primrose, Rhombic Evening Primrose |
| Oligoneuron rigidum | Stiff Goldenrod |
| Onopordum acanthium | Scotch Thistle, Scotch Cotton-thistle |
| Osmorhiza claytonii | Sweet Cicely, Clayton's Sweetroot |
| Osmorhiza longistylis | Aniseroot, Long-style Sweetroot, Smoother Sweet Cicely |
| Pedicularis canadensis | Wood Betony, Canadian Lousewort, Common Lousewort |
| Pedicularis lanceolata | Swamp Lousewort, Swamp Betony |
| Penstemon gracilis | Slender Beardtongue, Lilac Penstemon, Slender Penstemon |
| Penstemon grandiflorus | Large Beardtongue, Large-flowered Beardtongue, Large-flowered Penstemon |
| Penthorum sedoides | Ditch Stonecrop |
| Phlox divaricata | Wild Blue Phlox, Woodland Phlox |
| Phlox pilosa | Prairie Phlox, Downy Phlox |
| Phryma leptostachya | American Lopseed |
| Phyla lanceolata | Lance-leaf Fog Fruit, Northern Fog Fruit |
| Physalis heterophylla | Clammy Ground Cherry |
| Physalis virginiana | Virginia Ground Cherry |
| Physostegia virginiana | Obedient Plant, False Dragonhead |
| Platanthera clavellata | Small Green Wood Orchid, Green Woodland Orchid, Club-spur Orchid |
| Platanthera dilatata | Tall White Bog Orchid, Scentbottle, Leafy White Orchis |
| Platanthera flava var. herbiola | Tubercled Rein Orchid, Pale Green Orchid, Pale Green Orchis |
| Platanthera hyperborea | Northern Green Orchid, Northern Bog Orchid |
| Platanthera lacera | Ragged Fringed Orchid, Green Fringed Orchid, Ragged Orchis |
| Platanthera obtusata | Blunt-leaved Orchid, Small Northern Bog Orchid |
| Platanthera orbiculata | Large Round-leaved Orchid, Lesser Round-leaved Orchid |
| Platanthera praeclara | Western Prairie Fringed Orchid, Great Plains White Fringed Orchid |
| Platanthera psycodes | Lesser Purple Fringed Orchid, Small Purple Fringed Orchis |
| Pogonia ophioglossoides | Rose Pogonia, Snake-mouth Orchid, Adder's-mouth Pogonia |
| Polanisia dodecandra | Red-whisker Clammyweed |
| Polygala cruciata | Cross-leaved Milkwort, Drumheads |
| Polygala paucifolia | Gaywings, Fringed Milkwort, Flowering Wintergreen |
| Polygala polygama | Racemed Milkwort, Purple Milkwort |
| Polygala sanguinea | Blood Milkwort, Purple Milkwort, Field Milkwort |
| Polygala senega | Seneca Snakeroot, Mountain Flax, Rattlesnake Snakeroot |
| Polygala verticillata | Whorled Milkwort |
| Polygonatum biflorum | Smooth Solomon's Seal, Small Solomon's Seal |
| Polygonum amphibium | Swamp Smartweed, Longroot Smartweed, Water Knotweed |
| Polygonum virginianum | Jumpseed |
| Potentilla argentea | Silver Cinquefoil, Silvery Cinquefoil |
| Potentilla arguta | Tall Cinquefoil, Prairie Cinquefoil |
| Potentilla norvegica | Rough Cinquefoil, Norwegian Cinquefoil |
| Potentilla recta | Sulphur Cinquefoil, Rough-fruited Cinquefoil |
| Potentilla simplex | Common Cinquefoil |
| Prenanthes alba | White Rattlesnake-root, White Lettuce, Lion's-foot |
| Prunella vulgaris | Self-heal, Heal-all |
| Pycnanthemum virginianum | Virginia Mountain Mint |
| Pyrola elliptica | Shinleaf, Waxflower Shinleaf, Wild Lily-of-the-valley |
| Ranunculus abortivus | Little-leaf Buttercup, Kidney-leaf Buttercup, Small-flower Crowfoot |
| Ranunculus acris | Tall Buttercup, Common Buttercup, Crowfoot |
| Ranunculus cymbalaria | Alkali Buttercup, Seaside Crowfoot |
| Ranunculus pensylvanicus | Pennsylvania Buttercup, Bristly Buttercup, Bristly Crowfoot |
| Ranunculus recurvatus | Hooked Buttercup, Blisterwort, Hooked Crowfoot |
| Ranunculus rhomboideus | Prairie Buttercup, Labrador Buttercup |
| Ratibida columnifera | Prairie Coneflower, Upright Prairie Coneflower, Long-headed Coneflower |
| Ratibida pinnata | Gray-headed Coneflower, Pinnate Prairie Coneflower, Yellow Coneflower |
| Rosa arkansana | Prairie Rose, Wild Rose |
| Rudbeckia hirta | Black-eyed Susan |
| Rudbeckia laciniata | Cut-leaf Coneflower, Green-headed Coneflower, Tall Coneflower, Golden Glow |
| Rumex crispus | Curly Dock, Curled Dock, Yellow Dock |
| Sagittaria latifolia | Broad-leaf Arrowhead, Common Arrowhead, Duck Potato |
| Sanguinaria canadensis | Bloodroot |
| Saponaria officinalis | Bouncing Bet, Soapwort |
| Sarracenia purpurea | Purple Pitcher Plant, Northern Pitcher Plant |
| Scrophularia lanceolata | Lance-leaf Figwort, Early Figwort, Hare Figwort |
| Sicyos angulatus | Bur Cucumber, Oneseed Burr Cucumber |
| Silene csereii | Balkan Catchfly |
| Silphium perfoliatum | Cup Plant |
| Sisyrinchium campestre | Prairie Blue-eyed Grass, White-eyed Grass |
| Solanum dulcamara | Bittersweet Nightshade, Climbing Nightshade, Deadly Nightshade, Woody Nightshade |
| Solanum rostratum | Buffalo Bur Nightshade, Kansas Thistle |
| Solidago canadensis | Canada Goldenrod, Tall Goldenrod |
| Solidago flexicaulis | Zigzag Goldenrod, Broad-leaved Goldenrod |
| Solidago nemoralis | Gray Goldenrod, Field Goldenrod, Old-field Goldenrod |
| Solidago speciosa | Showy Goldenrod |
| Sonchus arvensis | Perennial Sowthistle, Field Sowthistle |
| Spiraea alba | White Meadowsweet |
| Spiraea tomentosa | Steeplebush, Hardhack |
| Spiranthes cernua | Nodding Ladies'-tresses |
| Stachys palustris | Marsh Hedge Nettle, Woundwort |
| Stellaria longifolia | Long-leaf Starwort, Long-leaved Stitchwort |
| Symphyotrichum ericoides | Heath Aster, White Heath Aster |
| Symphyotrichum laeve | Smooth Blue Aster |
| Symphyotrichum novae-angliae | New England Aster |
| Symphyotrichum oblongifolium | Aromatic Aster, Fall Aster |
| Symphyotrichum oolentangiense | Sky-blue Aster, Azure Aster |
| Symphyotrichum puniceum | Purple-stemmed Aster, Red-stem Aster, Swamp Aster |
| Symphyotrichum sericeum | Silky Aster, Western Silver Aster |
| Symplocarpus foetidus | Skunk Cabbage |
| Tanacetum vulgare | Common Tansy, Golden-buttons |
| Teucrium canadense | Germander, Canada Germander, American Germander, Wood Sage |
| Thalictrum dasycarpum | Tall Meadow Rue, Purple Meadow Rue |
| Thalictrum dioicum | Early Meadow Rue, Quicksilver-weed |
| Thalictrum thalictroides | Rue Anemone, Meadowrue |
| Thlaspi arvense | Field Pennycress |
| Torilis japonica | Japanese Hedge Parsley, Erect Hedge Parsley |
| Toxicodendron rydbergii | Western Poison Ivy |
| Tradescantia occidentalis | Spiderwort, Prairie Spiderwort |
| Tragopogon dubius | Yellow Goat's Beard, Yellow Salsify |
| Trientalis borealis | Starflower |
| Trifolium arvense | Rabbit-foot Clover |
| Trifolium pratense | Red Clover |
| Trillium cernuum | Nodding Trillium, Whip-poor-will Flower |
| Trillium flexipes | Drooping Trillium, Nodding Wake-robin, Declined Trillium |
| Trillium grandiflorum | Large-flowered Trillium, White Trillium, Snow Trillium, White Wake Robin |
| Typha latifolia | Broad-leaf Cat-tail, Common Cattail |
| Urtica dioica | Stinging Nettle |
| Uvularia grandiflora | Large-flowered Bellwort |
| Uvularia sessilifolia | Sessile-leaf Bellwort, Straw Lily, Wild Oats |
| Verbascum thapsus | Common Mullein, Great Mullein |
| Verbena bracteata | Big-bract Verbena, Prostrate Vervain, Bracted Vervain |
| Verbena hastata | Blue Vervain, Swamp Verbena |
| Verbena stricta | Hoary Vervain, Hoary Verbena |
| Verbena urticifolia | White Vervain, Nettle-leaf Vervain |
| Vernonia fasciculata | Prairie Ironweed, Western Ironweed, Smooth Ironweed |
| Veronica serpyllifolia | Thyme-leaf Speedwell |
| Veronicastrum virginicum | Culver's Root |
| Vicia americana | American Vetch, Purple Vetch |
| Viola Labradorica | Dog Violet, American Dog Violet, Alpine Violet, Labrador Violet |
| Viola macloskeyi | Small White Violet, Northern White Violet |
| Viola pedata | Birdfoot Violet, Beardless Birdfoot Violet |
| Viola pedatifida | Prairie Violet, Bearded Birdfoot Violet |
| Viola pubescens | Downy Yellow Violet, Smooth Yellow Violet |
| Zizia aurea | Golden Alexanders, Golden Zizia |