Illinois Natural History Survey - University of Illinois

List of Common Names

A B C D E F G H I J K L M N O P Q R S T U V X Y Z

A

Adder's Tongue (Ophioglossum vulgatum)
Agrimony (Agrimonia parviflora)
Alexanders, Golden (Zizia aurea)
Angelica (Angelica atropurpurea)
Apple (Malus spp.)
Apple, Hedge (Maclura pomifera)
Arbor Vitae (Thuja occidentalis)
Arrowhead or Arrow Plantain (Sagittaria latifolia)
Ash, Black (Fraxinus nigra)
Ash, Green (Fraxinus pennsylvanica)
Ash, Mountain (Sorbus americana) 
Ash, Prickly (Zanthoxylem americanum)
Ash, White (Fraxinus americana)
Aspen, Big Tooth (Populus grandidentata) 
Aspen, Quaking (Populus tremuloides)
Aster (Aster ericoides)
Aster, Flat-top (Doellingeria umbellata = Aster umbellatus)
Aster, Decurrent False (Boltonia decurrens)
Aster, False (Boltonia diffusa)
Aster, Heart-leaf (Aster cordifolius)
Aster, Narrow-leaf (Ionactis linariifolius = Aster linariifolius)
Aster, Silky (Aster sericeus)
Aunt Lucy (Ellisia nyctelea)
Avens, Spring (Geum vernum)
Avens, White (Geum canadense)

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Bald Cypress (Taxodium distichum)
Barley, Foxtail (Hordeum jubatum)
Barnyard Grass (Echinochloa muricata)
Basswood or Linden (Tilia americana)
Bastard Toadflax (Comandra umbellata)
Bean, Fuzzy (Strophostyles helvola)
Beautyberry, Chinese (Callicarpa dichotoma) 
Bedstraw (Galium aparine)
Bee Balm (Monarda didyma)
Bee Balm, Spotted (Monarda punctata)
Beech (Fagus grandifolia)
Beggarticks, Bearded (Bidens aristosa)
Beggarticks, Nodding (Bidens cernua)
Bellflower, American (Campanulastrum americanum = Campanula americana) 
Bellwort, Large-flowered (Uvularia grandiflora) 
Bellwort, Sessile-leaf (Uvularia sessilifolia) 
Bergamot (Monarda fistulosa)
Bergamot, Pale (Monarda clinopodia)
Bindweed, Hedge (Calystegia sepium)
Birch, River (Betula nigra)
Black-eyed Susan (Rudbeckia hirta)
Black Gum (Nyssa sylvatica)
Black Haw (Viburnum prunifolium)
Bladder Nut (Staphylea trifolia)
Blazing Star (Liatris pycnostachya)
Blazing Star, Rough (Liatris aspera)
Bleeding Heart (Dicentra eximia) 
Bloody Butcher (Trillium recurvatum)
Bluebells, Virginia (Mertensia virginica)
Blueberry, Low-bush (Vaccinium angustifolium) 
Blue-eyed Grass, White (Sisyrinchium albidum) 
Bluegrass (Poa pratense)
Blue-star (Amsonia tabernaemontana)
Bluestem, Big (Andropogon gerardii)
Bluestem, Bushy (Andropogon glomeratus)
Bluestem, Little (Schizachyrium scoparium) 
Bluets (Houstonia purpurea)
Boneset, Common (Eupatorium perfoliatum)
Boneset, Thoroughwort (Eupatorium serotinum)
Boneset, Upland (Eupatorium sessilifolium)
Borage, Common (Borago officinalis)
Bottlebrush Grass (Elymus hystrix = Hystrix patula)
Bottle Gentian, Closed (Gentiana andrewsii)
Briar, Green (Smilax lasioneura)
Briar, Bristly Green (Smilax hispida) 
Brookweed (Samolus valerandii)
Brown-eyed Susan (Rudbeckia triloba)
Buckeye, Ohio (Aesculus glabra)
Buckeye, Red (Aesculus pavia)
Buckeye, Yellow or Sweet (Aesculus octandra)
Buckwheat (Fagopyrum esculentum)
Bul-rush (Schoenoplectus pungens = Scirpus americanus)
Bunch-flower (Veratrum woodii)
Burning Bush, Winged (Euonymus alata)
Bur-reed (Sparganium eurycarpum)
Burhead, Creeping (Echinodorus cordifolius)
Bush-clover, Round-head (Lespedeza capitata)
Butter and Eggs (Linaria vulgaris)
Buttercup (Ranunculus abortivus)
Buttercup (Ranunculus sceleratus)
Butterfly Weed (Asclepias tuberosa)
Butterweed (Senecio glabellus)
Buttonbush (Cephalanthus occidentalis)
Buttonweed, Virginiana (Diodia virginiana)

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Cabbage, Skunk (Symplocarpus foetidus)
Cactus, Prickley Pear (Opuntia humifusa) 
Cancer Root (Conopholis americana)
Cardinal Flower (Lobelia cardinalis)
Carpet-weed (Mollugo verticillata)
Carrion-flower (Smilax lasioneura)
Castor Bean (Ricinus communis)
Catalpa, Northern (Catalpa speciosa)
Cattail (Typha latifolia)
Cattail, Narrow-leaf (Typha angustifolia) 
Cedar, Eastern Red (Juniperus virginiana) 
Cheatgrass (Bromus tectorum)
Cherry, Black (Prunus serotina)
Chervil, Wild (Chaerophyllum procumbens)
Chervil, Wild (Chaerophyllum tainturieri)
Chestnut (Castanea dentatat)
Chestnut, Chinese (Castanea mollissima)
Chickweed, Common (Stellaria media)
Chickweed, Giant (Myosoton aquaticum)
Chicory (Cichorium intybus)
Chokecherry, Black (Aronia melanocarpa)
Chufa Flat-sedge (Cyperus esculentus)
Cinquefoil, Shrubby (Potentilla fruticosa) 
Clammy-weed (Polanisia dodecandra)
Clover, Purple Prairie (Dalea purpurea = Petalostemum purpureum)
Clover, White Prairie (Dalea candida = Petalostemum candidum)
Clover, Round-head Bush- (Lespedeza capitata)
Cocklebur (Xanthium strumarium)
Cohosh, Blue (Caulophyllum thalictroides)
Colic Root (Aletris farinosa)
Columbine, Wild (Aquilegia canadensis)
Compass Plant (Silphium laciniatum) 
Coneflower, Grey-head (Ratibida pinnata)
Coneflower, Purple (Echinacea purpurea)
Coon's Tail (Ceratophyllum demersum)
Cordgrass (Spartina pectinata)
Corn Gromwell (Buglossoides arvense = Lithospermum arvense)
Corn Salad (Valerianella radiata)
Cottonwood (Populus deltoides)
Cow Parsnip (Heracleum lanatum)
Creeper, Virginia (Parthenocissus quinquefolia)
Cress, Purple Spring (Cardamine douglasii)
Cress, Water- (Rorippa nasturtium-aquaticum) 
Croton, Sand (Croton glandulosus var. septentrionalis) 
Cucumber, Bur (Sicyos angulatus)
Cucumber, Wild (Echinocystis lobata)
Culver's Root (Veronicastrum virginicum)
Cup-plant (Silphium perfoliatum)
Currant, Buffalo or Gooseberry (Ribes odoratum)
Cypress, Bald (Taxodium distichum)

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Daffodil (Narcissus poeticus)
Daffodil (Narcissus pseudonarcissus)
Daisy Fleabane (Erigeron annuus)
Daisy Fleabane (Erigeron philadelphicus)
Daisy, Ox Eye (Heliopsis helianthoides)
Dame's Rocket (Hesperis matronalis)
Dandelion (Taraxacum officinale)
Dayflower (Commelina erecta)
Dayflower, Asiatic (Commelina communis)
Dayflower, Climbing (Commelina diffusa)
Dead Nettle, Purple (Lamium purpureum)
Deptford Pink (Dianthus armeria)
Devil's Walking Stick (Aralia spinosa)
Dewberry (Rubus flagellaris)
Dock (Rumex altissimus)
Dock, Prairie (Silphium terebinthinaceum) 
Dock, Sour (Rumex acetosella)
Dock, Swamp (Rumex verticillatus)
Dodder (Cuscuta gronovii)
Dogbane (Apocynum cannabinum)
Dogwood, Flowering (Cornus florida)
Dogwood, Silky (Cornus obliqua)
Doll's Eyes (Actaea pachypoda)
Dragon, Green (Arisaema dracontium)
Duckweed (Lemna minor)
Dutchman's Breeches (Dicentra cucullaria)

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Eel-grass (Vallisneria americana)
Elderberry (Sambucus canadensis)
Elephant's Foot (Elephantopus caroliniana)
Elm (Ulmus americana)
Enchanter's Nightshade (Circaea lutetiana)
Eryngo, Spreading (Eryngium prostratum)
Evening Primrose, Common (Oenothera biennis)

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Fern, Cinnamon (Osmunda cinnamomea)
Fern, Grape (Botrychium dissectum)
Fern, Interrupted (Osmunda claytoniana)
Fern, Rattlesnake (Botrychium virginianum)
Fern, Royal (Osmunda regalis var. spectabilis)
Fern, Sensitive (Onoclea sensibilis)
Fern, Sweet (Comptonia peregrina)
Fire Pink (Silene virginica)
Fireweed, Burnweed (Erechtites hieraciifolia)
Flat-sedge (Cyperus pseudovegetus)
Flat-sedge, Chufa (Cyperus esculentus)
Flat-sedge, Red-root (Cyperus erythrorhizos)
Flax, Wild (Linum virginianum)
Fleabane, Daisy (Erigeron annuus)
Flowering Spurge (Euphorbia corollata)
Fogfruit (Phyla lanceolata)
Four O'Clock, Wild (Mirabilis nyctaginea)
Foxglove, False (Agalinis purpurea)
Floxglove, Clammy False (Aureolaria pedicularia var. ambigens)
Foxglove, Giant Yellow False (Aureolaria grandiflora)
Foxglove, False (Tomanthera auriculata) 
Foxglove (Penstemon digitalis)
Foxglove, Hairy (Penstemon hirsutus)
Foxglove, Pale (Penstemon pallidus)
Foxtail, Yellow (Setaria glauca)
Foxtail Barley (Hordeum jubatum)
Foxtail, Tufted (Alopecurus carolinianus)
Fuzzy-bean (Strophostyles helvola)

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Garlic Mustard (Alliaria petiolata)
Gaura (Gaura biennis)
Gentian, Closed Bottle (Gentiana andrewsii)
Geranium, Spotted (Geranium maculatum)
Germander (Teucrium canadense)
Ginger, Wild (Asarum canadense)
Ginkgo (Ginkgo biloba)
Ginseng (Panax quinquefolius)
Glade Mallow (Napaea dioica)
Goat's Beard (Tragopogon dubius)
Golden Alexanders (Zizia aurea)
Golden Glow (Rudbeckia laciniata)
Goldenrod (Solidago gigantea)
Goldenrod (Solidago juncea)
Goldenrod, Canada (Solidago canadensis)
Goldenrod, Grass-leaf (Euthamia graminifolia)
Goldenrod, Stiff (Oligoneuron rigidum = Solidago rigida)
Goldenrod, White (Solidago bicolor)
Gold Star (Hypoxis hirsuta)
Gooseberry, Buffalo Currant (Ribes odoratum)
Grama, Side Oats (Bouteloua curtipendula)
Grape Fern (Botrychium dissectum)
Grape, Frost (Vitis vulpina)
Grape, Riverbank (Vitis riparia)
Grape, Summer (Vitis aestivalis)
Grass, Barnyard (Echinochloa muricanta)
Grass, Blue- (Poa pratense)
Grass, Bottlebrush (Elymus hystrix = Hystrix patula)
Grass, Cord- (Spartina pectinata)
Grass, Fall Panic (Panicum dichotomiflorum)
Grass, French (Orbexilum onobrychis = Psoralea onobrychis)
Grass, Hard (Sclerochloa dura)
Grass, Indian (Sorghastrum nutans)
Grass-leaf Goldenrod (Euthamia graminifolia)
Grass, Panic (Panicum oligosanthes var. scribnerianum)
Grass, Reed Canary (Phalaris arundinacea) 
Grass, Switch (Panicum virgatum)
Grass, White Blue-eyed (Sisyrinchium albidum)
Greek Valerian, Jacob's Ladder (Polemonium reptans)
Green-briar (Smilax lasioneura)
Green-briar, Bristly (Smilax hispida) 
Green Violet (Hybanthus concolor)
Gromwell, Corn (Buglossoides arvense = Lithospermum arvense)
Ground Ivy (Glechoma hederacea)
Gum, Black (Nyssa sylvatica)
Gum, Sweet (Liquidambar styraciflua)

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Hackberry (Celtis occidentalis)
Harbinger-of-Spring (Erigenia bulbosa)
Hard Grass (Sclerochloa dura)
Haw, Black (Viburnum prunifolium)
Hawthorn (Crataegus mollis)
Hazelnut (Corylus americana)
Hedge Apple (Maclura pomifera)
Hemlock (Cicuta maculata)
Hemlock (Conium maculatum)
Hemp (Cannabis sativa)
Hickory, Bitternut (Carya cordiformis)
Hickory, Shagbark (Carya ovata)
Hogweed, Little (Portulaca oleracea)
Holly, American (Ilex opaca)
Holly, Swamp (Ilex decidua)
Hollyhock, WIld (Iliamna remota)
Honewort (Cryptotaenia canadensis)
Honey Locust (Gleditsia triacanthos)
Honeysuckle, Japanese (Lonicera japonica)
Honeysuckle, Maack's (Lonicera maackii)
Honeysuckle, Tatar's (Lonicera tatarica)
Hops, Common (Humulus lupulus)
Hornbeam, American (Carpinus caroliniana)
Horse Gentian, Illinois (Triosteum illinoense)
Horse Nettle (Solanum carolinense)
Horse-tail, Field (Equisetum arvense)
Horse-tail, Water (Equisetum hyemale ssp. affine)
Horse Weed (Conyza canadensis)
Hydrangea, Wild (Hydrangea arborescens)
Hyssop, Giant (Agastache scrophulariifolia)

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Indian Grass (Sorghastrum nutans)
Indigo, False (Amorpha fruticosa)
Indigo, Wild White (Baptisia lactea)
Iris, Dwarf Crested (Iris cristata)
Iris, Zigzag (Iris brevicaulis)
Ivy, Ground (Glechoma hederacea)
Ivy, Poison (Toxicodendron radicans = Rhus radicans) 

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Jack-in-the-Pulpit (Arisaema triphyllum)
Jacob's Ladder, Greek Valerian (Polemonium reptans)
Jewelweed, Pale (Impatiens pallida)
Jewelweed, Spotted (Impatiens capensis)
Joe-Pye Weed, Spotted (Eupatorium maculatum)

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Knapweed, Spotted (Centaurea biebersteinii)
Knotweed (Persicaria pensylvanica = Polygonum pensylvanicum)
Knotweed, Carey's (Persicaria careyi = Polygonum careyi)
Knotweed, Climbing (Fallopia scandens = Polygonum scandens)
Knotweed, Japanese (Reynoutria japonica = Polygonum cuspidatum) 
Knotweed, Nodding (Persicaria lapathifolia = Polygonum lapathifolium)

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Lady's Slipper Orchid, Yellow (Cypripedium pubescens)
Leaf Cup (Polymnia canadensis)
Lettuce, Woodland (Lactuca floridana)
Lilac (Syringa vulgaris)
Lily, Trout (Erythronium albidum)
Linden, American or Basswood (Tilia americana)
Lobelia, Downy (Lobelia puberula)
Lobelia, Great BlueLobelia siphilitica)
Lobelia, Palespike (Lobelia spicata)
Locust, Black (Robinia pseudoacacia)
Locust, Honey (Gleditsia triacanthos)
Loosestrife, Purple (Lythrum salicaria)
Loosestrife, Whorled (Lysimachia ciliata)
Loosestrife, Winged and Angled (Lythrum alatum)
Lousewort (Pedicularis lanceolata)
Lousewort, or Wood Betony (Pedicularis canadensis) 
Lupine (Lupinus perennis)

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Maidenhair Fern (Adiantum pedatum)
Mallow, Glade (Napaea dioica)
Mallow, Crimson-eyed Rose- (Hibiscus lasiocarpos)
Maple, Silver (Acer saccharinum)
Maple, Sugar (Acer saccharum)
Marijuana (Cannabis sativa)
May-apple (Podophyllum peltatum)
Meadow Beauty (Rhexia virginica)
Meadow Rue, False (Enemion biternatum = Isopyrum biternatum)
Meadow-sweet (Spiraea alba)
Meadow-sweet (Spiraea tomentosa)
Mercury, Three-seeded (Acalypha deamii)
Mercury, Three-seeded (Acalypha ostryifolia)
Milfoil, Water (Myriophyllum sibiricum)
Milkweed, Common (Asclepias syriaca)
Milkweed, Green (Asclepias hirtella)
Milkweed, Sullivant's (Asclepias sullivantii)
Milkweed, Swamp (Asclepias incarnata)
Milkweed, Whirled (Asclepias verticillata) 
Milkwort, Purple (Polygala polygama var. obtusata)
Milkwort, Field (Polygala sanguinea)
Mint, Wild (Mentha arvensis)
Mistflower (Conoclinium coelestinum = Eupatorium coelestinum)
Moneywort, Creeping Jenny (Lysimachia nummularia)
Monkey Flower (Mimulus ringens)
Monkey Flower, Winged (Mimulus alatus)
Monk's Hood (Aconitum uncinatum)
Morning Glory, Ivy-leaf (Ipomoea hederacea)
Morning Glory, Small White (Ipomoea lacunosa)
Morning Glory, Tall (Ipomoea purpurea)
Mother-wort (Leonurus cardiaca)
Mountain Mint (Pycnanthemum pilosum) 
Mountain Mint, Slender (Pycnanthemum tenuifolium)
Mud Plantain (Heteranthera dubia)
Mulberry, White (Morus alba)
Mullein (Verbascum thapsus)
Musclewood (Carpinus caroliniana)

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Nettle, False (Boehmeria cylindrica)
Nettle, Horse (Solanum carolinense)
Nettle, Stinging (Urtica dioica)
Nettle, Wood (Laportea canadensis)
New Jersey Tea (Ceanothus americanus)
Nightshade, Bittersweet (Solanum dulcamara)
Nut-rush (Scleria muhlenbergii)
Nut-rush (Scleria pauciflora var. caroliniana)

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Oak, Black (Quercus velutina)
Oak, Burr (Quercus macrocarpa)
Oak, Pin (Quercus palustris)
Oak, Red (Quercus rubra)
Oak, Scarlet (Quercus coccinea)
Oak, Shingle (Quercus imbricaria)
Oak, White (Quercus alba)
Oats, Sea- or Wood- (Chasmanthium latifolium)
Olive, Autumn (Elaeagnus umbellata)
Onion, Wild (Allium burdickii)
Onion, Wild (Allium schoenoprasum)
Orange, Osage (Maclura pomifera)
Orchid, Purple Fringeless (Platanthera peramoena = Habenaria peramoena)
Orchid, Showy (Orchis spectabilis)
Orchid, Yellow Wide-lip (Liparis loeselii)
Osage Orange (Maclura pomifera)
Ox-eye Daisy (Heliopsis helianthoides)

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Pagoda Plant (Blephilia ciliata)
Panic Grass, Fall (Panicum dichotomiflorum)
Pansy, Field (Viola rafinesqii)
Parsley, Prairie (Polytaenia nuttallii)
Parsnip (Pastinaca sativa)
Parsnip, Cow (Heracleum lanatum)
Partridge Pea (Chamaecrista fasciculata = Cassia fasciculata)
Partridge Pea (Chamaecrista nictitans = Cassia nictitans)
Paspalum (Paspalum floridanum)
Passionflower (Passiflora lutea)
Paw Paw (Asimina triloba)
Pea, Partridge (Chamaecrista fasciculata = Cassia fasciculata)
Pea, Partridge (Chamaecrista nictitans = Cassia nictitans)
Penny-cress (Thlaspi arvense)
Pepper, Water (Persecaria hydropiper = Polygonum hydropiper)
Persimmon (Diospyros virginiana)
Periwinkle (Vinca minor)
Petunia, False (Ruellia humilis)
Phlox, Cleft (Phlox bifida)
Phlox, Downy (Phlox pilosa)
Phlox, Garden (Phlox paniculata)
Phlox, Spring (Phlox divaricata)
Pickerelweed (Pontederia cordata)
Pigweed (Amaranthus tuberculatus)
Pimpernel, False (Lindernia dubia)
Pine, White (Pinus strobus)
Pineapple Weed (Matricaria matricariodes)
Plantain (Plantago rugelii)
Plantain, Arrow (Sagittaria latifolia)
Plantain, Mud (Heteranthera dubia)
Plantain, Water (Alisma plantago-aquatica)
Poinsettia, Wild (Poinsettia dentata = Euphorbia dentata)
Poison Ivy (Toxicodendron radicans = Rhus radicans) 
Pokeweed ( Phytolacca americana)
Pond-lily, Yellow (Nuphar luteum var. macrophyllum)
Pondweed (Potamogeton pectinatus)
Pondweed, Curly-leaf (Potamogeton crispus) 
Pondweed, Large-leaf (Potamogeton amplifolius) 
Poppy, Celandine (Chelidonium majus)
Prairie Smoke, Old Man's Whiskers (Geum triflorum)
Prickley Pear Cactus (Opuntia humifusa)
Primrose, Marsh (Ludwigia peploides)
Primrose, Rock (Primula mistassinica)
Princess Tree (Paulownia tomentosa)
Puccoon, Hoary (Lithospermum canescens)
Purple Rocket (Iodanthus pinnatifidus)
Pussy-toes (Antennaria plantaginifolia)
Putty Root Orchid (Aplectrum hyemale)

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Queen Anne's Lace (Daucus carota)
Quinine, Wild (Parthenium integrifolium) 

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Ragweed (Ambrosia bidentata)
Ragweed, Common (Ambrosia artemisiifolia)
Ragweed, Giant (Ambrosia trifida)
Ragwort, Golden (Senecio aureus)
Raspberry, Black (Rubus occidentalis)
Raspberry, Purple-flower (Rubus odoratus)
Rattlesnake Fern (Botrychium virginianum)
Rattlesnake Master (Eryngium yuccifolium)
Redbud (Cercis canadensis)
Red Cedar, Eastern (Juniperus virginiana)
Reed, Giant (Phragmites australis)
Richweed (Collinsonia canadensis)
Rocket, Purple (Iodanthus pinnatifidus)
Rocket, Yellow Garden (Barbarea vulgaris)
Rose-mallow, Crimson-eyed (Hibiscus lasiocarpus)
Rose, Prairie (Rosa carolina)
Rose, Swamp (Rosa palustris)
Rosinweed or Dock (Silphium integrifolium)
Rowan (Sorbus americana) 
Royal Catchfly (Silene regia)
Rush (Juncus greenei)
Rush, Bul- (Schoenoplectus pungens = Scirpus americanus)
Rush, Dudley's (Juncus dudleyi)
Rush, Nut- (Scleria muhlenbergii)
Rush, Nut- (Scleria pauciflora var. caroliniana)
Rush, Torrey's (Juncus torreyi)
Rye, Virginia Wild (Elymus virginicus)

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Sage, Blue or Pitcher (Salvia azurea)
Sandwort, Thyme-leaf (Arenaria serpyllifolia)
Sassafras (Sassafras albidum)
Sea-oats, or Wood-oats (Chasmanthium latifolium)
Sedge (Carex cumulata)
Sedge (Carex eburnea)
Sedge (Carex squarrosa)
Sedge, Bottlebrush (Carex hysericina)
Sedge, Ditch (Carex hyalinolepis)
Sedge, Fox (Carex vulpinoidea)
Sedge, Hop (Carex lupulina)
Sedge, Owl-fruit (Carex stipata)
Sedge, Parasol (Carex umbellata)
Sedge, Pennsylvania (Carex pensylvanica)
Sedge, Rosy (Carex rosea)
Sedge, Woodland (Carex blanda)
Seedbox (Ludwigia alternifolia)
Self-heal (Prunella vulgaris)
Sensitive Fern (Onoclea sensibilis)
Serviceberry (Amelanchier arborea)
Shepherd's Purse (Capsella bursa-pastoris) 
Shooting Star (Dodecatheon meadia)
Side Oats Grama (Bouteloua curtipendula)
Skullcap (Scutellaria galericulata)
Skullcap (Scutellaria incana)
Skunk Cabbage (Symplocarpus foetidus)
Smartweed (Persicaria pensylvanica = Polygonum pensylvanicum)
Smartweed, Carey's (Persicaria careyi = Polygonum careyi)
Smartweed, Climbing (Polygonum scandens)
Smartweed, Nodding (Persicaria lapathifolia = Polygonum lapathifolium)
Smartweed, Water (Persicaria amphibia = Polygonum amphibium)
Snakecotton (Froelichia floridana)
Snake-root (Sanicula smallii)
Snake-root, Black (Sanicula odorata = Sanicula gregaria)
Sneezeweed (Helenium autumnale)
Sneezeweed, Purple-head (Helenium flexuosum)
Soapwort (Saponaria officinalis)
Solomon's Seal, False (Smilicina racemosa) 
Sorrel, Wood (Oxalis dillenii)
Spice Bush (Lindera benzoin)
Spiderwort, Ohio (Tradescantia ohiensis)
Spiderwort, Zigzag (Tradescantia subaspera)
Spikenard, American (Aralia racemosa)
Spikerush, Needle (Eleocharis acicularis)
Spikerush, Blunt (Eleocharis obtusa)
Spongeplant (Limnobium spongia)
Spring Beauty (Claytonia virginica)
Spurge, Flowering (Euphorbia corollata)
Stickseed (Hackelia virginiana)
Sticktight, Bearded Beggarticks (Bidens aristosa)
Sticktight, Nodding Beggarticks (Bidens cernua)
St. John's Wort (Hypericum adpressum)
St. John's Wort (Hypericum mutilum)
St. John's Wort (Hypericum prolificum)
St. John's Wort, Spotted (Hypericum punctatum)
Strawberry (Fragaria virginiana)
Sumac, Fragrant (Rhus aromatica)
Sumac, Smooth (Rhus glabra)
Sumac, Staghorn (Rhus typhina)
Sumac, Winged (Rhus copallina)
Sunflower (Helianthus giganteus)
Sunflower, Common (Helianthus annuus)
Sunflower, Sawtooth (Helianthus grosseserratus)
Sweet-clover, White (Melilotus alba)
Sweet-clover, Yellow (Melilotus officinalis)
Sweet Gum (Liquidambar styraciflua)
Switch Grass (Panicum virgatum)
Sycamore (Platanus occidentalis)

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Tea, New Jersey (Ceanothus americanus)
Tear Thumb (Tracaulon sagittatum = Polygonum sagittatum)
Teasel, Cut-leaf (Dipsacus laciniatus)
Thistle, Bull (Cirsium vulgare)
Thistle, Canada (Cirsium arvense)
Thistle, Field (Cirsium discolor)
Thistle, Swamp (Cirsium muticum)
Thistle, Tall (Cirsium altissimum)
Three-seeded Mercury (Acalypha deamii)
Three-seeded Mercury (Acalypha ostryifolia)
Tickseed, Tall (Coreopsis tripteris)
Ticktrefoil (Desmodium glutinosum)
Ticktrefoil, Illinois (Desmodium illinoense)
Timothy (Phleum pratense)
Toadflax, Bastard (Comandra umbellata)
Tooth-ache Tree (Zanthoxylem americanum)
Tooth-cup (Ammania coccinea)
Tooth-cup (Rotala ramosior)
Toothwort (Cardamine concatenata = Dentaria laciniata)
Touch-me-not, Pale (Impatiens pallida)
Touch-me-not, Spotted (Impatiens capensis)
Tovara (Antenoron virginianum = Polygonum virginianum = Tovara virginiana)
Trillium (Trillium recurvatum)
Trout Lily (Erythronium albidum)
Trumpet Creeper (Campsis radicans)
Tulip Tree, Tulip Poplar (Liriodendron tulipifera)
Turtlehead (Chelone glabra)
Twin Leaf (Jeffersonia diphylla)

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Velvet-leaf (Abutilon theophrasti) 
Vervain, Blue (Verbena hastata)
Vervain, Hoary (Verbena stricta)
Vervain, White (Verbena urticifolia)
Vetch, Carolina (Vicia caroliniana)
Viburnum, Maple-leaf (Viburnum acerifolium) 
Violet (Viola canadensis)
Violet, Bird's Foot (Viola pedata)
Violet, Common Blue (Viola sororia)
Violet, Cream (Viola striata)
Violet, Downy Yellow (Viola pubescens) 
Violet, Green (Hybanthus concolor)
Violet, Sweet (Viola odorata)
Virginia Creeper (Parthenocissus quinquefolia)
Virginia Wild Rye (Elymus virginicus)
Virgin's Bower (Clematis viorna) 

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Walnut, Black (Juglans nigra)
Water-cress (Rorippa nasturtium-aquaticum) 
Water Horehound (Lycopus americanus)
Water Horehound (Lycopus virginicus)
Waterleaf (Hydrophyllum appendiculatum)
Waterleaf, Virginia (Hydrophyllum virginianum)
Water Milfoil (Myriophyllum sibiricum)
Water Pepper (Persecaria hydropiper = Polygonum hydropiper)
Water Plantain (Alisma plantago-aquatica)
Water-weed (Elodea canadensis)
Wild Indigo, White (Baptisia lactea)
Willow, Black (Salix nigra)
Willow, Peach-leaf (Salix amygdaloides)
Willow, Prairie (Salix humilis)
Willow, Sandbar (Salix exigua)
Willowherb (Epilobium coloratum)
Willowherb, Bog (Epilobium leptophyllum)
Wingstem (Verbesina alternifolia)
Witch Hazel (Hamamelis virginiana)
Wood Nettle (Laportea canadensis)
Wood Nettle (Laportea canadensis)
Wood-reed (Cinna arundinacea)
Wood Sorrel (Oxalis dillenii)
Wool-grass (Scirpus cyperinus)

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