Illinois Natural History Survey - University of Illinois

List of Species

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

Abutilon theophrasti (Velvet-leaf)
Acalypha deamii (Three-seeded Mercury)
Acalypha ostryifolia (Three-seeded Mercury)
Acer saccharinum (Silver Maple)
Acer saccharum (Sugar Maple)
Aconitum uncinatum (Monk's Hood)
Actaea pachypoda (Doll's Eyes)
Adiantum pedatum (Maidenhair Fern)
Aesculus glabra (Ohio Buckeye)
Aesculus octandra (Yellow Buckeye)
Aesculus pavia (Red Buckeye)
Agalinis purpurea (False Foxglove)
Agastache scrophulariifolia (Giant Hyssop)
Agrimonia parviflora (Agrimony)
Aletris farinosa (Colic Root)
Alisma plantago-aquatica (Water Plantain)
Alliaria petiolata (Garlic Mustard)
Allium burdickii (Wild Onion)
Allium schoenoprasum (Wild Onion)
Alopecurus carolinianus (Tufted Foxtail)
Amaranthus tuberculatus (Pigweed)
Ambrosia artemisiifolia (Common Ragweed)
Ambrosia bidentata (Ragweed)
Ambrosia trifida (Giant Ragweed)
Amelanchier arborea (Serviceberry)
Ammania coccinea (Tooth-cup)
Amorpha fruticosa (False Indigo)
Amsonia tabernaemontana (Blue-star)
Andropogon gerardii (Big Bluestem)
Andropogon glomeratus (Bushy Bluestem)
Angelica atropurpurea (Angelica)
Antennaria plantaginifolia (Pussy Toes)
Antenoron virginianum = Polygonum virginianum = Tovara virginiana (Tovara)
Aplectrum hyemale (Putty-root Orchid)
Apocynum cannabinum (Dogbane)
Aquilegia canadensis (Wild Columbine)
Aralia racemosa (American Spikenard)
Aralia spinosa (Devil's Walking Stick)
Arenaria serpyllifolia (Thyme-leaf Sandwort)
Arisaema dracontium (Green Dragon)
Arisaema triphyllum (Jack-in-the-Pulpit)
Aronia melanocarpa (Black Chokecherry)
Asarum canadense (Wild Ginger)
Asclepias hirtella (Green Milkweed)
Asclepias incarnata (Swamp Milkweed)
Asclepias sullivantii (Sullivant's Milkweed)
Asclepias syriaca (Common Milkweed)
Asclepias tuberosa (Butterfly Weed)
Asclepias verticillata (Whirled Milkweed)
Asimina triloba (Paw Paw, Indiana Banana)
Aster cordifolius (Heart-leaf Aster)
Aster ericoides (Aster)
Aster linariifolius = Ionactis linariifolius (Narrow Leaf Aster)
Aster sericeus (Silky Aster)
Aster umbellatus = Doellingeria umbellata (Flat-top Aster)
Aureolaria grandiflora (Giant Yellow False Foxglove)
Aureolaria pedicularia var. ambigens (Clammy False Foxglove)

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Baptisia lactea (White Wild Indigo)
Barbarea vulgaris (Garden Yellow Rocket)
Betula nigra (River Birch)
Bidens aristosa (Bearded Beggarticks, Sticktight)
Bidens cernua (Nodding Beggarticks, Sticktight)
Blephilia ciliata (Pagoda Plant)
Boehmeria cylindrica (False Nettle)
Boltonia decurrens (Decurrent False Aster)
Boltonia diffusa (False Aster)
Borago officinalis (Common Borage)
Botrychium dissectum (Grape Fern)
Botrychium virginianum (Rattlesnake Fern)
Bouteloua curtipendula (Side Oats Grama)
Bromus tectorum (Cheatgrass)
Buglossoides arvense = Lithospermum arvense (Corn Gromwell)

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Callicarpa dichotoma (Chinese Beautyberry)
Calystegia sepium (Hedge Bindweed)
Campanula americana = Campanulastrum americanum (American Bellflower)
Campanulastrum americanum = Campanula americana (American Bellflower)
Campsis radicans (Trumpet Creeper)
Cannabis sativa (Hemp; Marijuana)
Capsella bursa-pastoris (Shepherd's Purse)
Cardamine concatenata = Dentaria laciniata (Toothwort)
Cardamine douglassii (Purple Spring Cress)
Carex blanda (Woodland Sedge)
Carex cumulata (Sedge)
Carex eburnea (Sedge)
Carex hyalinolepis (Ditch Sedge)
Carex hystericina (Bottlebrush Sedge)
Carex lupulina (Hop Sedge)
Carex pensylvanica (Pennsylvania Sedge)
Carex rosea (Rosy Sedge)
Carex squarrosa (Sedge)
Carex stipata (Owl-fruit Sedge)
Carex umbellata (Parasol Sedge)
Carex vulpinoidea (Fox Sedge)
Carpinus caroliniana (Musclewood, American Hornbeam)
Carya cordiformis (Bitternut Hickory)
Carya ovata (Shagbark Hickory)
Cassia fasciculata = Chamaecrista fasciculata (Partridge Pea)
Cassia nictatans = Chamaecrista nictatans (Partridge Pea)
Castanea dentata (American Chestnut)
Castanea mollissima (Chinese Chestnut)
Catalpa speciosa (Northern Catalpa)
Caulophyllum thalictroides (Blue Cohosh)
Ceanothus americanus (Teaberry, New Jersey Tea)
Celtis occidentalis (Hackberry)
Centaurea biebersteinii (Spotted Knapweed)
Cephalanthus occidentalis (Buttonbush)
Ceratophyllum demersum (Coon's Tail)
Cercis canadensis (Redbud)
Chaerophyllum procumbens (Chervil)
Chaerophyllum tainturieri (Chervil)
Chamaecrista fasciculata = Cassia fasciculata (Partridge Pea)
Chamaecrista nictatans = Cassia nictatans (Partridge Pea)
Chasmanthium latifolium (Sea-oats, Wood-oats)
Chelidonium majus (Celandine Poppy)
Chelone glabra (Turtlehead)
Cichorium intybus (Chicory)
Cicuta maculata (Hemlock)
Cinna arundinacea (Wood-reed)
Circaea lutetiana (Enchanter's Nightshade)
Cirsium altissimum (Tall Thistle)
Cirsium arvense (Canada Thistle)
Cirsium discolor (Field Thistle)
Cirsium muticum (Swamp Thistle)
Cirsium vulgare (Bull Thistle)
Claytonia virginica (Spring Beauty)
Clematis viorna (Virgin's Bower)
Collinsonia canadensis (Richweed)
Comandra umbellata (Bastard Toadflax)
Commelina communis (Asiatic Dayflower)
Commelina diffusa (Climbing Dayflower)
Commelina erecta (Dayflower)
Comptonia peregrina (Sweet Fern)
Conium maculatum (Hemlock)
Conoclinium coelestinum = Eupatorium coelestinum (Mistflower)
Conopholis americana (Cancer Root)
Conyza canadensis (Horse Weed)
Coreopsis tripteris (Tall Tickseed)
Cornus florida (Flowering Dogwood)
Cornus obliqua (Silky Dogwood)
Corylus americana (Hazelnut)
Crataegus mollis (Hawthorn)
Croton glandulosus var. septentrionalis (Sand Croton)
Cryptotaenia canadensis (Honewort)
Cuscuta gronovii (Dodder)
Cyperus erythrorhizos (Red-root Flat-sedge)
Cyperus esculentus (Chufa Flat-sedge)
Cyperus pseudovegetus (Flat-sedge)
Cypripedium pubescens (Yellow Lady's Slipper)

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Dalea candida = Petalostemum candidum (White Prairie Clover)
Dalea purpurea = Petalostemum purpureum (Purple Prairie Clover)
Daucus carota (Carrot, Queen Anne's Lace)
Dentaria laciniata = Cardamine concatenata (Toothwort)
Desmodium glutinosum (Ticktrefoil)
Desmodium illinoense (Illinois Ticktrefoil)
Dianthus armeria (Deptford Pink)
Dicentra cucullaria (Dutchman's Breeches)
Dicentra eximia (Bleeding Heart)
Diodia virginiana (Virginia Buttonweed)
Diospyros virginiana (Persimmon)
Dipsacus laciniatus (Cut-leaf Teasel)
Dodecatheon meadia (Shooting Star)
Doellingeria umbellata = Aster umbellatus (Flat-top Aster)

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Echinacea purpurea (Purple Coneflower)
Echinochloa muricata (Barnyard Grass)
Echinocystis lobata (Wild Cucumber)
Echinodorus cordifolius (Creeping Burhead)
Elaeagnus umbellata (Autumn Olive)
Eleocharis acicularis (Needle Spikerush)
Eleocharis obtusa (Blunt Spikerush)
Elephantopus caroliniana (Elephant's Foot)
Ellisia nyctelea (Aunt Lucy)
Elodea canadensis (Water-weed)
Elymus hystrix = Hystrix patula (Bottlebrush Grass)
Elymus virginicus (Virginia Wild Rye)
Enemion biternatum = Isopyrum biternatum (False Meadow Rue)
Epilobium coloratum (Willowherb)
Epilobium leptophyllum (Bog Willowherb)
Equisetum arvense (Field Horse-tail)
Equisetum hyemale ssp. affine (Water Horse-tail)
Erechtites hieraciifolia (Fireweed, Burnweed)
Erigenia bulbosa (Harbinger-of-Spring)
Erigeron annuus (Daisy Fleabane)
Erigeron philadelphicus (Daisy Fleabane)
Eryngium prostratum (Spreading Eryngo)
Eryngium yuccifolium (Rattlesnake Master)
Erythronium albidum (Trout Lily)
Euonymus alata (Winged Burning Bush)
Eupatorium coelestinum = Conoclinium coelestinum (Mistflower)
Eupatorium maculatum (Spotted Joe-Pye Weed)
Eupatorium perfoliatum (Common Boneset)
Eupatorium serotinum (Boneset, Thoroughwort)
Eupatorium sessilifolium (Upland Boneset)
Euphorbia corollata (Flowering Spurge)
Euphorbia dentata = Poinsettia dentata (Wild Poinsettia)
Euthamia graminifolia (Grass-leaf Goldenrod)

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Fagopyrum esculentum (Buckwheat)
Fagus grandifolia (Beech)
Fallopia scandens = Polygonum scandens (Climbing Knotweed, Smartweed)
Fragaria virginiana (Strawberry)
Fraxinus americana (White Ash)
Fraxinus nigra (Black Ash)
Fraxinus pennsylvanica (Green Ash)
Froelichia floridana (Froelichia, Snakecotton)

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Galium aparine (Bedstraw)
Gaura biennis (Gaura)
Gentiana andrewsii (Closed Bottle Gentian)
Geranium maculatum (Spotted Geranium)
Geum canadense (White Avens)
Geum triflorum (Prairie Smoke)
Geum vernum (Spring Avens)
Ginkgo biloba (Ginkgo)
Glechoma hederacea (Ground Ivy)
Gleditsia triacanthos (Honey Locust)

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Habenaria peramoena = Platanthera peramoena (Purple Fringeless Orchid)
Hackelia virginiana (Stickseed)
Hamamelis virginiana (Witch Hazel)
Helenium autumnale (Sneezeweed)
Helenium flexuosum (Purple Head Sneezeweed)
Helianthus annuus (Common Sunflower)
Helianthus giganteus (Sunflower)
Helianthus grosseserratus (Sawtooth Sunflower)
Heliopsis helianthoides (Ox-eye Daisy)
Heracleum lanatum (Cow Parsnip)
Hesperis matronalis (Dame's Rocket)
Heteranthera dubia (Mud-plantain)
Hibiscus lasiocarpos (Crimson-eyed Rose-mallow)
Hordeum jubatum (Foxtail Barley)
Houstonia purpurea (Bluets)
Humulus lupulus (Common Hops)
Hybanthus concolor (Green Violet)
Hydrangea arborescens (Wild Hydrangea)
Hydrophyllum appendiculatum (Waterleaf)
Hydrophyllum virginianum (Virginia Waterleaf)
Hypericum adpressum (St. John's Wort)
Hypericum mutilum (St. John's Wort)
Hypericum prolificum (St. John's Wort)
Hypericum punctatum (St. John's Wort)
Hypoxis hirsuta (Gold Star)
Hystrix patula = Elymus hystrix (Virginia Wild Rye)

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Ilex decidua (Swamp Holly)
Ilex opaca (American Holly)
Iliamna remota (Wild Hollyhock)
Impatiens capensis (Spotted Touch-Me-Not, Jewelweed)
Impatiens pallida (Pale Touch-Me-Not, Jewelweed)
Iodanthus pinnatifidus (Purple Rocket)
Ionactis linariifolius = Aster linariifolius (Narrow Leaf Aster)
Ipomoea hederacea (Ivy-leaf Morning Glory)
Ipomoea lacunosa (Small White Morning Glory)
Ipomoea purpurea (Tall Morning Glory)
Iris brevicaulis (Zigzag Iris)
Iris cristata (Dwarf Crested Iris)
Iris shrevei (Wild Blue Iris)
Isopyrum biternatum = Enemion biternatum (False Meadow Rue)

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Jeffersonia diphylla (Twin Leaf)
Juglans nigra (Black Walnut)
Juncus dudleyi (Dudley's Rush)
Juncus greenei (Rush)
Juncus torreyi (Torrey's Rush)
Juniperus virginiana (Eastern Red Cedar)

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Lactuca floridana (Woodland Lettuce)
Lamium purpureum (Purple Dead Nettle)
Laportea canadensis (Wood Nettle)
Lemna minor (Duckweed)
Leonurus cardiaca (Mother-wort)
Lespedeza capitata (Round-head Bush-clover)
Liatris aspera (Rough Blazing Star)
Liatris pycnostachya (Blazing Star)
Limnobium spongia (Spongeplant)
Linaria vulgaris (Butter and Eggs)
Lindera benzoin (Spice Bush)
Lindernia dubia (False Pimpernel)
Linum virginianum (Wild Flax)
Liparis loeselii (Yellow Wide-lip Orchid)
Liquidambar styraciflua (Sweet Gum)
Liriodendron tulipifera (Tulip Tree)
Lithospermum canescens (Hoary Puccoon)
Lobelia cardinalis (Cardinal Flower)
Lobelia puberula (Downy Lobelia)
Lobelia siphilitica (Great Blue Lobelia)
Lobelia spicata (Palespike Lobelia)
Lonicera japonica (Japanese Honeysuckle)
Lonicera maackii (Maack's Honeysuckle)
Lonicera tatarica (Honeysuckle)
Ludwigia alternifolia (Seedbox)
Ludwigia peploides (Marsh Primrose)
Lupinus perennis (Lupine)
Lycopus americanus (Water Horehound)
Lycopus virginicus (Water Horehound)
Lysimachia ciliata (Whorled Loosestrife)
Lysimachia nummularia (Moneywort, Creeping Jenny)
Lythrum alatum (Winged and Angled Loosestrife)
Lythrum salicaria (Purple Loosestrife)

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Maclura pomifera (Hedge Apple; Osage Orange)
Malus spp. (Apple)
Matricaria matricariodes (Pineapple Weed)
Melilotus alba (White Sweet-clover)
Melilotus officinalis (Yellow Sweet-clover)
Mentha arvensis (Wild Mint)
Mertensia virginica (Virginia Bluebells)
Mimulus alatus (Winged Monkey Flower)
Mimulus ringens (Monkey Flower)
Mirabilis nyctaginea (Four O'Clock)
Mollugo verticillata (Carpet-weed)
Monarda clinopodia (Pale Bergamot)
Monarda didyma (Bee Balm)
Monarda fistulosa (Bergamot)
Monarda punctata (Spotted Bee Balm)
Morus alba (White Mulberry)
Myosoton aquaticum (Giant Chickweed)
Myriophyllum sibiricum (Water Milfoil)

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Napaea dioica (Glade Mallow)
Narcissus poeticus (Daffodil)
Narcissus pseudonarcissus (Daffodil)
Nuphar luteum var. macrophyllum (Yellow Pond-lily)
Nyssa sylvatica (Black Gum)

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Oenothera biennis (Common Evening Primrose)
Oligoneuron rigidum = Solidago rigida (Stiff Goldenrod)
Onoclea sensibilis (Sensitive Fern)
Ophioglossum vulgatum (Adder's Tongue)
Opuntia humifusa (Prickley Pear Cactus)
Orbexilum onobrychis = Psoralea onobrychis = (French Grass)
Orchis spectabilis (Showy Orchid)
Osmunda cinnamomea (Cinnamon Fern)
Osmunda claytoniana (Interrupted Fern)
Osmunda regalis var. spectabilis (Royal Fern)
Ostrya virginiana (Hop Hornbeam)
Oxalis dillenii (Wood Sorrel)

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Panax quinquefolius (Ginseng)
Panicum dichotomiflorum (Fall Panic Grass)
Panicum oligosanthes var. scribnerianum (Panic Grass)
Panicum virgatum (Switch Grass)
Parthenium integrifolium (Wild Quinine)
Parthenocissus quinquefolia (Virginia Creeper)
Paspalum floridanum (Paspalum)
Passiflora lutea (Passionflower)
Pastinaca sativa (Parsnip)
Paulownia tomentosa (Princess Tree)
Pedicularis canadensis (Wood Betony, Lousewort)
Pedicularis lanceolata (Lousewort)
Penstemon digitalis (Foxglove)
Penstemon hirsutus (Hairy Foxglove)
Penstemon pallidus (Pale Foxglove)
Persicaria amphibia = Polygonum amphibium = (Water Smartweed)
Persicaria careyi = Polygonum careyi (Carey's Knotweed)
Persicaria hydropiper = Polygonum hydropiper (Water Pepper)
Persicaria lapathifolia = Polygonum lapathifolium (Nodding Knotweed, Smartweed)
Persicaria pensylvanica = Polygonum pensylvanicum (Knotweed, Smartweed)
Petalostemum candidum = Dalea candida (White Prairie Clover)
Petalostemum purpureum = Dalea purpurea (Purple Prairie Clover)
Phalaris arundinacea (Reed Canary Grass)
Phleum pratense (Timothy)
Phlox bifida (Cleft Phlox)
Phlox divaricata (Spring Phlox)
Phlox paniculata (Garden Phlox)
Phlox pilosa (Downy Phlox)
Phragmites australis (Giant Reed)
Phyla lanceolata (Fogfruit)
Phytolacca americana (Pokeweed)
Pinus strobus (White Pine)
Plantago rugelii (Plantain)
Platanthera peramoena = Habenaria peramoena (Purple Fringeless Orchid)
Platanus occidentalis (Sycamore)
Poa pratensis (Bluegrass)
Podophyllum peltatum (May-apple)
Poinsettia dentata = Euphorbia dentata (Wild Poinsettia)
Polanisia dodecandra (Clammyweed)
Polemonium reptans (Jacob's Ladder)
Polygala polygama var. obtusata (Purple Milkwort)
Polygala sanguinea (Field Milkwort)
Polygonum amphibium = Persicaria amphibia (Water Smartweed)
Polygonum careyi = Persicaria careyi (Carey's Knotweed)
Polygonum cuspidatum = Reynoutria japonica (Japanese Knotweed)
Polygonum hydropiper = Persicaria hydropiper (Water Pepper)
Polygonum lapathifolium = Persicaria lapathifolia (Nodding Knotweed, Smartweed)
Polygonum pensylvanicum = Persicaria pensylvanica (Knotweed, Smartweed)
Polygonum sagittatum = Tracaulon sagittatum (Tear Thumb)
Polygonum scandens = Fallopia scandens (Climbing Knotweed, Smartweed)
Polygonum virginianum = Antenoron virginianum (Tovara)
Polymnia canadensis (Leaf Cup)
Polytaenia nuttallii (Prairie Parsley)
Pontederia cordata (Pickerelweed)
Populus deltoides (Cottonwood)
Populus grandidentata (Big Tooth Aspen)
Populus tremuloides (Quaking Aspen)
Portulaca oleracea (Little Hogweed)
Potamogeton amplifolius (Large-leaf Pondweed)
Potamogeton crispus (Curly-leaf Pondweed)
Potamogeton pectinatus (Pondweed)
Potentilla fruticosa (Shrubby Cinquefoil)
Primula mistassinica (Primrose)
Prunella vulgaris (Self-heal)
Prunus serotina (Black Cherry)
Psoralea onobrychis = Orbexilum onobrychis (French Grass)
Pycnanthemum pilosum (Mountain Mint)
Pycnanthemum tenuifolium (Slender Mountain Mint)

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Quercus alba (White Oak)
Quercus coccinea (Scarlet Oak)
Quercus imbricaria (Shingle Oak)
Quercus macrocarpa (Burr Oak)
Quercus palustris (Pin Oak)
Quercus rubra (Red Oak)
Quercus velutina (Black Oak)

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Ranunculus abortivus (Buttercup)
Ranunculus sceleratus (Buttercup)
Ratibida pinnata (Grey-head Coneflower)
Reynoutria japonica = Polygonum cuspidatum (Japanese Knotweed)
Rhexia virginica (Meadow Beauty)
Rhus aromatica (Fragrant Sumac)
Rhus copallina (Winged Sumac)
Rhus glabra (Smooth Sumac)
Rhus radicans = Toxicodendron radicans (Poison Ivy)
Rhus typhina (Staghorn Sumac)
Ribes odoratum (Gooseberry, Buffalo Currant)
Ricinus communis (Castor Bean)
Robinia pseudoacacia (Black Locust)
Rorippa nasturtium-aquaticum (Water-cress)
Rosa carolina (Prairie Rose)
Rosa palustris (Swamp Rose)
Rotala ramosior (Tooth-cup)
Rubus flagellaris (Dewberry)
Rubus occidentalis (Black Raspberry)
Rubus odoratus (Purple Raspberry)
Rudbeckia hirta (Black-eyed Susan)
Rudbeckia laciniata (Golden Glow)
Rudbeckia triloba (Brown-eyed Susan)
Ruellia humilis (False Petunia)
Rumex acetosella (Sour Dock)
Rumex altissimus (Dock)
Rumex verticillatus (Swamp Dock)

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Sagittaria latifolia (Arrow Plantain, Arrowhead)
Salix amygdaloides (Peach-leaf Willow)
Salix exigua (Sandbar Willow)
Salix humilis (Prairie Willow)
Salix nigra (Black Willow)
Salvia azurea (Blue Sage, Pitcher Sage)
Sambucus canadensis (Elderberry)
Samolus valerandii (Brookweed)
Sanicula odorata = Sanicula gregaria (Black Snakeroot)
Sanicula smallii (Snakeroot)
Saponaria officinalis (Soapwort)
Sassafras albidum (Sassafras)
Schizachyrium scoparium (Little Bluestem)
Schoenoplectus pungens = Scirpus americanus (Bulrush)
Scirpus americanus = Schoenoplectus pungens (Bulrush)
Scirpus cyperinus (Wool-grass)
Scleria muhlenbergii (Nut-rush)
Scleria pauciflora var. caroliniana (Nut-rush)
Sclerochloa dura (Hard Grass)
Scutellaria galericulata (Skullcap)
Scutellaria incana (Skullcap)
Senecio aureus (Golden Ragwort)
Senecio glabellus (Butterweed)
Setaria glauca (Yellow Foxtail)
Sicyos angulatus (Bur Cucumber)
Silene regia (Royal Catchfly)
Silene virginica (Fire Pink)
Silphium integrifolium (Dock, Rosinweed)
Silphium laciniatum (Compass Plant)
Silphium perfoliatum (Cup-plant)
Silphium terebinthinaceum (Prairie Dock)
Sisyrinchium albidum (Blue-eyed Grass)
Smilacina racemosa (False Solomon's Seal)
Smilax hispida (Bristly Green Briar)
Smilax lasioneura (Green Briar, Carrion-flower)
Solanum carolinense (Horse Nettle)
Solanum dulcamara (Bittersweet Nightshade)
Solidago canadensis (Canada Goldenrod)
Solidago bicolor (White Goldenrod)
Solidago gigantea (Goldenrod)
Solidago juncea (Goldenrod)
Solidago rigida = Oligoneuron rigidum (Stiff Goldenrod)
Sorbus americana (Mountain Ash; Rowan)
Sorghastrum nutans (Indian Grass)
Sparganium eurycarpum (Bur-reed)
Spartina pectinata (Cordgrass)
Spiraea alba (Meadow-sweet)
Spiraea tomentosa (Meadow-sweet)
Staphylea trifolia (Bladder Nut)
Stellaria media (Common Chickweed)
Strophostyles helvola (Fuzzy-bean)
Symplocarpus foetidus (Skunk Cabbage)
Syringa vulgaris (Lilac)

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Taraxacum officinale (Dandelion)
Taxodium distichum (Bald Cypress)
Teucrium canadense (Germander)
Thlaspi arvense (Penny-cress)
Thuja occidentalis (Arbor Vitae)
Tilia americana (Basswood, American Linden)
Tomanthera auriculata (False Foxglove)
Toxicodendron radicans = Rhus radicans (Poison Ivy)
Tracaulon sagittatum = Polygonum sagittatum (Tear Thumb)
Tradescantia ohiensis (Ohio Spiderwort)
Tradescantia subaspera (Zigzag Spiderwort)
Tragopogon dubius (Goat's Beard)
Trillium recurvatum (Bloody Butcher)
Triosteum illinoense (Illinois Horse Gentian)
Typha angustifolia (Narrow-leaf Cattail)
Typha latifolia (Cattail)

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Ulmus americana (Elm)
Urtica dioica (Stinging Nettle)
Uvularia grandiflora (Large-flowered Bellwort)
Uvularia sessilifolia (Sessile-leaf Bellwort)

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Vaccinium angustifolium (Low-bush Blueberry)
Valerianella radiata (Corn Salad)
Vallisneria americana (Eel-grass)
Veratrum woodii (Bunch-flower)
Verbascum thapsus (Mullein)
Verbena hastata (Blue Vervain)
Verbena stricta (Hoary Vervain)
Verbena urticifolia (White Vervain)
Verbesina alternifolia (Wingstem)
Veronicastrum virginicum (Culver's Root)
Viburnum acerifolium (Maple-leaf Viburnum)
Viburnum prunifolium (Black Haw)
Vicia caroliniana (Carolina Vetch)
Vinca minor (Periwinkle)
Viola canadensis (Violet)
Viola odorata (Sweet Violet)
Viola pedata (Bird's Foot Violet)
Viola pubescens (Downy Yellow Violet)
Viola rafinesquii (Field Pansy)
Viola sororia (Common Blue Violet)
Viola striata (Cream Violet)
Vitis aestivalis (Summer Grape)
Vitis riparia (Riverbank Grape)
Vitis vulpina (Frost Grape)

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Xanthium strumarium (Cocklebur)

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Zanthoxylem americanum (Prickly Ash; Tooth-ache Tree)
Zizia aurea (Golden Alexanders)