Prior to settlement by people of European descent, more than 60% of the land area of Illinois was in prairie vegetation, more than 22 million acres. Some counties in Central Illinois were more than 90% prairie. Today, only about 2,300 acres of high quality, unplowed prairie remains in Illinois, mostly in very small, isolated remnants. Three noteworthy examples of such remnants are: Loda Cemetery Prairie Nature Preserve in Iroquois County, Prospect Cemetery Prairie Nature Preserve in Ford County, and Weston Cemetery Prairie Nature Preserve in McLean County. These three prairies are all mesic blacksoil prairies, about 5 acres in size, and officially dedicated Illinois Nature Preserves; the plants and animals are protected. These examples were originally pioneer cemeteries established on virgin prairie.
The soil that developed under blacksoil prairies is one of the most agriculturally productive soils in the world, and very nearly all prairies were plowed. Because blacksoil prairies are so rare today, it is often difficult to find out what plant species occur in this habitat. Over the years, we have put together a list of flowering plants for these three prairies. This list can serve as a model for those planning prairie restorations. Each prairie can be considered a sample plot on the original vast prairie, and the combined species list for all three remnants is an approximation of the diversity of plants that would have been found on virgin mesic blacksoil prairies in Central Illinois. The information is from unpublished files at the Center for Biodiversity, Illinois Natural History Survey. Most data is from the work of Paul Shildneck, Kenneth R. Robertson, and John Taft.
The numbers in the column entitled “C/C” are the Coefficient of Conservatism as used in this reference: J. B. Taft, G. S. Wilhelm, D. M. Ladd, and L. A. Masters. 1997. Floristic quality assessment for vegetation in Illinois, a method for assessing vegetation integrity. Erigenia (Journal of the Illinois Native Plant Society) 15: 1-95. This coefficient ranges from 0 to 10; species with lower numbers are “weedy” and found in disturbed habitats, while species with higher numbers are found primarily in undisturbed habitats. Only native plants are assigned numbers.
| Scientific name | Family | Common Name | Native | C/C | Prairies |
| Acalypha gracilens | Euphorbiaceae | Slender Mercury | Yes | 4 | Loda, Prospect, Weston |
| Acalypha virginica | Euphorbiaceae | Virginia Mercury | Yes | 2 | Prospect |
| Acer saccharinum | Aceraceae | Silver Maple | Yes | 1 | Prospect |
| Achillea millefolium | Asteraceae | Common Yarrow | No | * | Loda, Prospect |
| Allium canadense | Liliaceae | Wild Onion | Yes | 2 | Loda, Weston |
| Ambrosia artemisiifolia | Asteraceae | Common Ragweed | Yes | 0 | Loda, Prospect |
| Ambrosia trifida | Asteraceae | Giant Ragweed | Yes | 0 | Weston |
| Amorpha canescens | Fabaceae | Lead Plant | Yes | 8 | Loda, Prospect, Weston |
| Andropogon gerardii | Poaceae | Big Bluestem | Yes | 5 | Loda, Prospect, Weston |
| Anemone cylindrica | Ranunculaceae | Thimbleweed | Yes | 8 | Prospect, Weston |
| Antennaria neglecta | Asteraceae | Pussytoes, Cat’s Foot | Yes | 4 | Prospect |
| Apocynum cannabinum | Apocynaceae | Dogbane | Yes | 2 | Prospect |
| Apocynum sibiricum | Apocynaceae | Indian Hemp | No | 2 | Loda, Weston |
| Arctium minus | Apocynaceae | Common Burdock | Yes | * | Prospect |
| Asclepias sullivantii | Asclepiadaceae | Sullivant’s Milkweed | Yes | 7 | Loda, Prospect, Weston |
| Asclepias syriaca | Asclepiadaceae | Common Milkweed | Yes | 0 | Loda, Prospect, Weston |
| Asclepias tuberosa | Asclepiadaceae | Butterfly Weed, Chigger Weed | Yes | 5 | Loda, Prospect |
| Asclepias verticillata | Asclepiadaceae | Horsetail Milkweed | Yes | 1 | Loda, Prospect, Weston |
| Asparagus officinalis | Liliaceae | Wild Asparagus | No | * | Loda, Prospect |
| Aster azureus | Asteraceae | Sky-Blue Aster | Yes | 7 | Weston |
| Aster ericoides | Asteraceae | Heath Aster | Yes | 4 | Loda, Prospect, Weston |
| Aster laevis | Asteraceae | Smooth Aster | Yes | 8 | Prospect, Weston |
| Aster novae-angliae | Asteraceae | New England Aster | Yes | 4 | Loda, Prospect |
| Aster pilosus | Asteraceae | Hairy-Aster | Yes | 0 | Loda, Prospect, Weston |
| Aster praealthus | Asteraceae | Willow Aster | Yes | 4 | Loda |
| Astragalus canadensis | Fabaceae | Canadian Milk Vetch | Yes | 7 | Weston |
| Baptisia leucantha | Fabaceae | White Wild Indigo | Yes | 6 | Loda |
| Baptisia leucophaea | Fabaceae | Cream Wild Indigo | Yes | 9 | Prospect, Weston |
| Blephilia ciliata | Lamiaceae | Ohio Horse Mint | Yes | 6 | Loda |
| Bromus inermis | Poaceae | Smooth Brome | No | * | Prospect, Weston |
| Cacalia tuberosa | Asteraceae | Prairie Indian Plantain | Yes | 10 | Loda |
| Calystegia sepium | Convolvulaceae | American Bindweed | Yes | 1 | Loda, Prospect, Weston |
| Campsis radicans | Bignoniaceae | Trumpet Creeper | Yes | 2 | Prospect |
| Carex annectens | Cyperaceae | Large Yellow Fox Sedge | Yes | 3 | Loda |
| Carex bicknellii | Cyperaceae | Prairie Sedge | Yes | 8 | Loda, Prospect, Weston |
| Carex granularis | Cyperaceae | Pale Sedge | Yes | 2 | Loda |
| Carex gravida | Cyperaceae | Long-awned Bracted Sedge | Yes | 4 | Loda, Prospect, Weston |
| Carex meadii | Cyperaceae | Mead’s Stiff Sedge | Yes | 6 | Loda, Prospect, Weston |
| Carex molesta | Cyperaceae | Field Oval Sedge | Yes | 2 | Loda |
| Carex normalis | Cyperaceae | Spreading Oval Sedge | Yes | 4 | Prospect, Weston |
| Carex stipitata | Cyperaceae | Common Fox Sedge | Yes | 2 | Prospect |
| Carex tenera | Cyperaceae | Narrow-leaved Oval Sedge | Yes | 5 | Prospect |
| Carex vulpinoidea | Cyperaceae | Brown Fox Sedge | Yes | 3 | Prospect |
| Cassia fasciculata | Fabaceae | Partridge Pea | Yes | 1 | Loda, Weston |
| Ceanothus americanus | Rhamnaceae | New Jersey Tea | Yes | 8 | Loda, Prospect, Weston |
| Celastrus scandens | Celastraceae | Bittersweet | Yes | 2 | Loda, Prospect |
| Celtis occidentalis | Ulmaceae | Hackberry | Yes | 3 | Prospect, Weston |
| Cerastium vulgatum | Caryophyllaceae | Mouse-Eared Chickweed | No | * | Prospect |
| Chamaesyce maculata | Euphorbiaceae | Nodding Spurge | No | * | Loda |
| Chenopodium album | Chenopodiaceae | Lamb’s Quarters | No | * | Prospect, Weston |
| Chrysanthemum leucanthemum | Asteraceae | Ox-eye Daisy | No | * | Loda |
| Cichorium intybus | Asteraceae | Chicory | No | * | Loda |
| Cirsium arvense | Asteraceae | Field Thistle | No | * | Prospect |
| Cirsium discolor | Asteraceae | Pasture Thistle | Yes | 3 | Loda, Prospect, Weston |
| Cirsium vulgare | Asteraceae | Bull Thistle | No | * | Prospect |
| Claytonia virginica | Portulacaceae | Spring Beauty | Yes | 1 | Loda, Prospect |
| Comandra umbellata | Santalaceae | Bastard Toadflax | Yes | 6 | Prospect, Weston |
| Convallaria majalis | Liliaceae | Lily-of-the-valley | No | * | Loda, Prospect |
| Coreopsis palmata | Asteraceae | Prairie Coreopsis | Yes | 6 | Weston |
| Coreopsis tripteris | Asteraceae | Tall Tickseed | Yes | 4 | Loda, Prospect, Weston |
| Cornus drummondii | Cornaceae | Rough-leaved Dogwood | Yes | 2 | Loda |
| Cornus racemosa | Cornaceae | Gray Dogwood | Yes | 2 | Loda, Prospect |
| Crataegus crus-galli | Rosaceae | Cock-spur Hawthorn | Yes | 2 | Prospect |
| Crataegus sp. | Rosaceae | Hawthorn | Yes | – | Prospect, Weston |
| Crotolaria sagittalis | Fabaceae | Rattlebox | Yes | 3 | Prospect |
| Dactylis glomerata | Poaceae | Orchard Grass | No | * | Loda |
| Dalea candida | Fabaceae | White Prairie Clover | Yes | 9 | Weston |
| Dalea purpurea | Fabaceae | Pruple Prairie Clover | Yes | 8 | Loda, Prospect |
| Daucus carota | Apiaceae | Queen Anne’s Lace | No | * | Loda, Prospect, Weston |
| Desmodium canadense | Fabaceae | Showy Tick Trefoil | Yes | 5 | Loda, Prospect, Weston |
| Desmodium illinoense | Fabaceae | Illinois Tick Trefoil | Yes | 5 | Loda, Prospect, Weston |
| Diospyros virginiana. | Ebenaceae | Persimmon | Yes | 2 | Loda |
| Dipsacus laciniatus | Dipsacaceae | Cut-leaf Teasel | No | * | Loda |
| Dipsacus sylvestris | Dipsacaceae | Common Teasel | No | * | Loda |
| Dodecatheon media | Primulaceae | Shooting Star | Yes | 6 | Loda, Weston |
| Echinacea pallida | Asteraceae | Pale Coneflower | Yes | 7 | Loda, Prospect, Weston |
| Eleocharis compressa | Cyperaceae | Golden-seeded Spike Rush | Yes | 8 | Loda, Prospect |
| Eleocharis verrucosa | Cyperaceae | Slender Spike Rush | Yes | 7 | Prospect |
| Elymus canadensis | Poaceae | Canadian Wild Rye | Yes | 4 | Loda, Prospect, Weston |
| Elymus virginicus | Poaceae | Virginia Wild Rye | Yes | 4 | Loda, Prospect, Weston |
| Erigeron annuus | Asteraceae | Annual Fleabane | Yes | 1 | Loda, Prospect, Weston |
| Erigeron strigosus | Asteraceae | Daisy Fleabane | Yes | 2 | Loda, Prospect |
| Eryngium yuccifolium | Apiaceae | Rattlesnake Master | Yes | 7 | Loda, Prospect, Weston |
| Eupatorium altissimum | Asteraceae | Tall Boneset | Yes | 2 | Prospect |
| Eupatorium serotinum | Asteraceae | Late Boneset | Yes | 1 | Loda |
| Euphorbia corollata | Euphorbiaceae | Flowering Spruge | Yes | 3 | Loda, Prospect, Weston |
| Euphorbia cyparissias | Euphorbiaceae | Cypress Spurge | No | * | Prospect, Weston |
| Festuca pratensis | Poaceae | Meadow Fescue | No | * | Loda |
| Fragaria virginiana | Rosaceae | Wild Strawberry | Yes | 2 | Loda, Prospect, Weston |
| Galium aparine | Rubiaceae | Annual Bedstraw | Yes | 0 | Prospect |
| Galium obtusum | Rubiaceae | Wild Madder | Yes | 5 | Loda |
| Gaura biennis | Onagraceae | Butterfly-weed | Yes | 2 | Loda, Prospect, Weston |
| Gaura longiflora | Onagraceae | Common Gaura | Yes | 5 | Prospect |
| Gentiana puberulenta | Gentianaceae | Downy Gentian | Yes | 9 | Prospect, Weston |
| Geum canadense | Rosaceae | White Avens | Yes | 2 | Loda, Prospect |
| Helianthus grosseserratus | Asteraceae | Sawtooth sunflower | Yes | 2 | Loda, Prospect, Weston |
| Helianthus mollis | Asteraceae | Downy Sunflower | Yes | 7 | Prospect |
| Helianthus rigidus | Asteraceae | Prairie Sunflower | Yes | 6 | Loda, Prospect, Weston |
| Heliopsis helianthoides | Asteraceae | False Sunflower | Yes | 4 | Prospect |
| Hemerocallis fulva | Amaryllidaceae | Orange Day Lily | No | * | Loda, Prospect, Weston |
| Houstonia purpurea | Rubiaceae | Broad-leafed Bluets | Yes | 7 | Loda |
| Hypericum perforatum | Hypericaceae | Commons St. John’s Wort | No | * | Loda |
| Hypericum sphaerocarpum | Hypericaceae | Round-fruited St. John’s Wort | Yes | 5 | Loda, Prospect |
| Hypoxis hirsuta | Liliaceae | Yellow Star Grass | Yes | 6 | Loda, Prospect, Weston |
| Iris germanica | Iridaceae | Iris | No | * | Prospect, Weston |
| Juncus interior | Juncaceae | Inland Rush | Yes | 3 | Loda |
| Juniperus virginiana | Cupressaceae | Red Cedar | Yes | 1 | Prospect |
| Koeleria macrantha | Poaceae | June Grass | Yes | 7 | Weston |
| Kuhnia eupatorioides | Asteraceae | False Boneset | Yes | 6 | Prospect |
| Lactuca canadensis | Asteraceae | Wild Lettuce | Yes | 1 | Loda, Prospect, Weston |
| Lespedeza capitata | Fabaceae | Round-headed Bush Clover | Yes | 4 | Loda, Prospect, Weston |
| Liatris aspera | Asteraceae | Rough Blazing-star | Yes | 7 | Weston |
| Liatris pycnostachya | Asteraceae | Prairie Blazing-star | Yes | 6 | Loda |
| Lilium philadelphicumsubsp. andinum | Liliaceae | Prairie Lily | Yes | 10 | Prospect |
| Linum sulcatum | Linaceae | Grooved Yellow Flax | Yes | 8 | Weston |
| Lithospermum canescens | Boraginaceae | Hoary Puccoon | Yes | 6 | Prospect, Weston |
| Lobelia spicata | Campanulaceae | Spiked Lobelia | Yes | 4 | Loda, Prospect, Weston |
| Lonicera japonica | Caprifoliaceae | Japanese Honeysuckle | No | * | Prospect |
| Lonicera maackii | Caprifoliaceae | Amur Honeysuckle | No | * | Prospect |
| Lonicera tartarica | Caprifoliaceae | Tartarian Honeysuckle | No | * | Prospect |
| Lysimachia ciliata | Primulaceae | Fringed Loosestrife | Yes | 4 | Weston |
| Lysimachia lanceolata | Primulaceae | Lance-leafed Loosestrife | Yes | 6 | Loda, Prospect |
| Lysimachia nummularia | Primulaceae | Moneywort | No | * | Loda |
| Lythrum alatum | Lythraceae | Winged Loosestrife | Yes | 5 | Loda |
| Malus ioensis | Rosaceae | Iowa Crab | Yes | 3 | Loda, Weston |
| Medicago lupulina | Fabaceae | Black Medick | No | * | Loda, Prospect |
| Medicago sativa | Fabaceae | Alfalfa | No | * | Weston |
| Melilotus alba | Fabaceae | White Sweet Clover | No | * | Loda, Prospect, Weston |
| Mirabilis nyctaginea | Nyctaginaceae | Wild Four O’Clock | No | * | Weston |
| Monarda fistulosa | Lamiaceae | Wild Bergamot | Yes | 4 | Loda, Prospect, Weston |
| Morus alba | Moraceae | White Mulberry | No | * | Prospect |
| Morus rubra | Moraceae | Red Mulberry | Yes | 4 | Weston |
| Muhlenbergia frondosa | Poaceae | Common Satin Grass | Yes | 3 | Weston |
| Oenothera biennis | Onagraceae | Common Evening Primrose | Yes | 1 | Prospect, Weston |
| Oenothera pilosella | Onagraceae | Prairie Sundrops | Yes | 6 | Loda |
| Ornithogalum umbellatum | Liliaceae | Star of Bethlehem | No | * | Prospect |
| Oxalis dillenii | Oxalidaceae | Yellow Wood Sorrel | Yes | 0 | Loda, Prospect, Weston |
| Oxalis violacea | Oxalidaceae | Violet Wood Sorrel | Yes | 5 | Prospect, Weston |
| Paeonia sp. | Paeoniaceae | Peony | No | * | Weston |
| Panicum acuminatum | Poaceae | Panic Grass | Yes | ? | Loda, Prospect |
| Panicum leibergii | Poaceae | Prairie Panic Grass | Yes | 7 | Loda, Prospect |
| Panicum oligosanthes | Poaceae | Few-flowered Panic Grass | Yes | 5 | Prospect, Weston |
| Panicum praecocius | Poaceae | Panic grass | Yes | 7 | Prospect |
| Panicum villosissimum | Poaceae | White-haired Panic Grass | Yes | 5 | Prospect |
| Panicum virgatum | Poaceae | Switch Grass | Yes | 4 | Loda, Prospect, Weston |
| Parthenium integrifolium | Asteraceae | Wild Quinine | Yes | 8 | Loda, Prospect |
| Parthenocissus quinquefolia | Vitaceae | Virginia Creeper | Yes | 2 | Prospect |
| Pastinaca sativa | Apiaceae | Wild Parsnip | No | * | Loda, Prospect, Weston |
| Pedicularis canadensis | Scrophulariaceae | Lousewort | Yes<*/TD> | 7 | Prospect, Weston |
| Perideridia americana | Apiaceae | Thicket Parsley | Yes | 6 | Loda |
| Phleum pratense | Poaceae | Timothy | No | * | Loda, Prospect, Weston |
| Phlox paniculata | Polemoniaceae | Garden Phlox | No | * | Weston |
| Phlox pilosa | Polemoniaceae | Prairie Phlox | Yes | 7 | Loda, Prospect, Weston |
| Physalis heterophylla | Solanaceae | Clammy Ground Cherry | Yes | 2 | Loda, Prospect |
| Physalis lanceolata | Solanaceae | Lance-leaved Ground Cherry | No | * | Prospect |
| Physalis subglabrata | Solanaceae | Tall Ground Cherry | Yes | 0 | Loda |
| Physalis virginiana | Solanaceae | Lance-leaved Ground Cherry | Yes | 2 | Prospect, Weston |
| Physostegia virginiana | Lamiaceae | Obedient Plant | Yes | 6 | Prospect, Weston |
| Plantago rugelii | Plantaginaceae | Red-stalked Plantain | Yes | 0 | Prospect |
| Platanthera leucophaea | Orchidaceae | Prairie White Fringed Orchid | Yes | 10 | Loda |
| Poa compressa | Poaceae | Canada Bluegrass | No | * | Prospect, Weston |
| Poa pratensis | Poaceae | Kentucky Bluegrass | No | * | Loda, Prospect, Weston |
| Polygala verticillata | Polygalaceae | Wholed Milkwort | Yes | 5 | Loda, Prospect |
| Polygonatum commutatum | Liliaceae | Solomon’s Seal | Yes | 4 | Prospect |
| Polygonum amphibium | Polygonaceae | Water Knotweed | Yes | 3 | Loda |
| Polytaenia nuttallii | Apiaceae | Prairie Parsley | Yes | 8 | Loda |
| Populus alba | Salicaceae | White Popular | No | * | Prospect |
| Potentilla arguta | Rosaceae | Prairie Cinquefoil | Yes | 10 | Prospect, Weston |
| Potentilla simplex | Rosaceae | Common Cinquefoil | Yes | 3 | Loda, Prospect |
| Prenanthes aspera | Asteraceae | Rough White Lettuce | Yes | 8 | Prospect, Weston |
| Prunella vulgaris | Lamiaceae | Self Heal | Yes | 1 | Loda, Prospect |
| Prunus americana | Rosaceae | Wild Plum | Yes | 3 | Loda, Prospect |
| Prunus serotina | Rosaceae | Black Cherry | Yes | 1 | Loda, Prospect, Weston |
| Pycnanthemum tenuifolium | Lamiaceae | Slender Mountain Mint | Yes | 4 | Loda, Prospect |
| Pycnanthemum virginianum | Lamiaceae | Common Mountain Mint | Yes | 5 | Loda, Prospect, Weston |
| Quercus velutina | Fagaceae | Black Oak | Yes | 5 | Prospect |
| Ranunculus abortivus | Ranunculaceae | Small-flowered Buttercup | Yes | 1 | Prospect |
| Ratibida pinnata | Asteraceae | Drooping Coneflower | Yes | 4 | Loda, Prospect, Weston |
| Rhus radicans | Anacardiaceae | Poison Ivy | Yes | 1 | Loda, Prospect |
| Rosa carolina | Rosaceae | Pasture Rose | Yes | 4 | Loda, Prospect, Weston |
| Rosa multiflora | Rosaceae | Multiflora Rose | No | * | Prospect |
| Rubus alleghaniensis | Rosaceae | Common Black-berry | Yes | 2 | Prospect, Weston |
| Rubus occidentalis | Rosaceae | Black Raspberry | Yes | 2 | Prospect, Weston |
| Rubus pensilvanicus | Rosaceae | Pennsylvania Blackberry | Yes | 2 | Loda, Prospect |
| Rudbeckia hirta | Asteraceae | Black-eyed Susan | Yes | 2 | Loda, Weston |
| Rudbeckia triloba | Asteraceae | Brown-eyed Susan | Yes | 3 | Loda |
| Ruellia humilis | Acanthaceae | Wild Petunia | Yes | 10 | Loda, Prospect, Weston |
| Rumex crispus | Polygonaceae | Curly Dock | No | * | Loda, Weston |
| Sanicula canadensis | Apiaceae | Canadian Black Snakeroot | Yes | 4 | Loda, Prospect |
| Schizachyrium scoparium | Poaceae | Little Bluestem | Yes | 5 | Loda, Prospect, Weston |
| Scirpus pendulus | Cyperaceae | Red bulrush | Yes | 3 | Loda |
| Scutellaria leonardii | Lamiaceae | Small Skullcap | Yes | 5 | Loda, Prospect |
| Scutellaria parvula | Lamiaceae | Small Skullcap | Yes | 6 | Prospect |
| Sedum purpureum | Crassulaceae | Live-forever | No | * | Prospect |
| Setaria glauca | Poaceae | Yellow Foxtail | No | * | Loda, Weston |
| Silphium integrifolium | Asteraceae | Rosinweed | Yes | 5 | Loda, Prospect, Weston |
| Silphium laciniatum | Asteraceae | Compass Plant | Yes | 5 | Loda, Prospect, Weston |
| Silphium terebinthinaceum | Asteraceae | Prairie Dock | Yes | 4 | Loda, Prospect, Weston |
| Sisyrinchium albidum | Iridaceae | Common Blue-eyed Grass | Yes | 4 | Loda, Prospect, Weston |
| Sisyrinchium campestre | Iridaceae | Prairie Blue-eyed Grass | Yes | 6 | Prospect |
| Smilax hispida | Iridaceae | Bristly Green Briar | Yes | 3 | Prospect |
| Solanum carolinense | Solanaceae | Horse Nettle | Yes | 0 | Loda |
| Solidago canadensis | Asteraceae | Canada Goldenrod | Yes | 1 | Loda, Weston |
| Solidago gigantea | Asteraceae | Late Goldenrod | Yes | 3 | Loda |
| Solidago graminifolia | Asteraceae | Grass-leaved Goldenrod | Yes | 3 | Loda |
| Solidago juncea | Asteraceae | Early Goldenrod | Yes | 4 | Loda |
| Solidago missouriensis | Asteraceae | Missouri Goldenrod | Yes | 4 | Loda, Weston |
| Solidago nemoralis | Asteraceae | Field Goldenrod | Yes | 3 | Loda, Prospect |
| Solidago rigida | Asteraceae | Rigid Goldenrod | Yes | 4 | Loda, Prospect, Weston |
| Sorghastrum nutans | Poaceae | Indian Grass | Yes | 4 | Loda, Prospect, Weston |
| Spartina pectinata | Poaceae | Prairie Cord Grass | Yes | 4 | Loda, Prospect |
| Spiraea prunifolia | Rosaceae | Bridal-Wreath | No | * | Prospect |
| Sporolobus aspera | Poaceae | Rough Dropseed | Yes | 3 | Prospect, Weston |
| Sporobolus heterolepis | Poaceae | Prairie Dropseed | Yes | 9 | Loda, Prospect, Weston |
| Stipa spartea | Poaceae | Porcupine Grass | Yes | 6 | Prospect, Weston |
| Syringa vulgaris | Oleaceae | Common lilac | No | * | Prospect |
| Taraxacum officinale | Asteraceae | Dandelion | No | * | Prospect, Weston |
| Thaspium barbinode | Apiaceae | Hairy Meadow Parsnip | Yes | 7 | Loda |
| Tradescantia ohiensis | Apiaceae | Ohio Spiderwort | Yes | 3 | Prospect |
| Tragopogon dupius | Asteraceae | Sand Goat’s Beard | No | * | Loda, Weston |
| Tragopogon pratensis | Asteraceae | Common Goat’s Beard | No | * | Loda, Prospect, Weston |
| Trifolium campestre | Fabaceae | Low Hop Clover | No | * | Prospect |
| Trifolium pratense | Fabaceae | Red Clover | No | * | Loda, Prospect, Weston |
| Ulmus rubra | Ulmaceae | Slippery Elm | Yes | 3 | Prospect |
| Verbena canadensis | Verbenaceae | Rose Vervain | Yes | 7 | Loda |
| Verbena urticifolia | Verbenaceae | White Vervain | Yes | 3 | Prospect |
| Veronicastrum virginicum | Scrophulariaceae | Culver’s Root | Yes | 6 | Loda, Weston |
| Viburnum lantana | Caprifoliaceae | Wayfaring Tree | No | * | Prospect |
| Viburnum opulus | Caprifoliaceae | European Highbush Cranberry | No | * | Prospect |
| Viburnum prunifolium | Caprifoliaceae | Black Haw | Yes | 4 | Prospect |
| Vinca minor | Apocynaceae | Common Periwinkle | No | * | Prospect |
| Viola pedatifida | Violaceae | Prairie Violet | Yes | 9 | Loda, Prospect, Weston |
| Viola pratincola | Violaceae | Common Blue Violet | Yes | 1 | Loda, Prospect, Weston |
| Viola soraria | Violaceae | Woolly Blue Violet | Yes | 3 | Loda, Prospect |
| Vitis riparia | Vitaceae | Riverbank Grape | Yes | 2 | Loda, Prospect |
| Yucca flaccida | Liliaceae | Yucca | No | * | Prospect |
| Zizia aurea | Apiaceae | Golden Alexanders | Yes | 6 | Loda, Prospect, Weston |
Updated 25 June 2004