Native plants · Illinois
Native plants of Warren County
301 plant species are recorded as native to Illinois in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in Warren County by USDA PLANTS. 146 of them have growing records you can filter by light, moisture, height and estimated cold hardiness. 3 more species are listed as both native and introduced and kept in a separate section.
County summary · USDA PLANTS and Kew WCVP
Warren County, Illinois
- Native species
- 301 Typical Illinois county: 641 (median of 102 counties)
- Garden-ready natives
- 146 Typical Illinois county: 272
- Share by type (all 301 native species)
-
Percent of the 301 native species in each growth type
Wildflowers make up the largest share of the native list (59%), followed by grasses and grass-like plants (18%).
The native plant list
Garden-ready natives 146
Native species with PLANTS growing records (height, light, moisture, minimum temperature). “—” means PLANTS has no value.
| Plant | Type | Height | Light | Water use | Hardy to |
|---|---|---|---|---|---|
| Allegheny blackberry Rubus allegheniensis | Shrub | 6 ft | Shade-tolerant | Medium | Zone 4b |
| American basswood Tilia americana | Tree | 100 ft | Shade-tolerant | Medium | Zone 2b |
| American bellflower Campanulastrum americanum | Wildflower (forb) | 6 ft | Shade-tolerant | Medium | Zone 12b |
| American bittersweet Celastrus scandens | Vine | 15 ft | Shade-tolerant | High | Zone 3b |
| American elm Ulmus americana | Tree | 120 ft | Sun–part shade | High | Zone 2b |
| American hazelnut Corylus americana | Shrub | 10 ft | Sun–part shade | Medium | Zone 4a |
| American pokeweed Phytolacca americana | Wildflower (forb) | 7.3 ft | Shade-tolerant | Medium | Zone 4a |
| American sycamore Platanus occidentalis | Tree | 100 ft | Sun–part shade | High | Zone 4a |
| American water horehound Lycopus americanus | Wildflower (forb) | 1.8 ft | Shade-tolerant | High | Zone 3b |
| American water plantain Alisma subcordatum | Wildflower (forb) | 6 in | Sun | High | Zone 4a |
| Atlantic camas Camassia scilloides | Wildflower (forb) | 2.5 ft | Shade-tolerant | Medium | Zone 4b |
| big bluestem Andropogon gerardii | Grass or grass-like | 6 ft | Sun | Low | Zone 2b |
| bitternut hickory Carya cordiformis | Tree | 75 ft | Sun | Medium | Zone 2b |
| black cherry Prunus serotina | Tree | 80 ft | Sun | Medium | Zone 4a |
| black maple Acer nigrum | Tree | 100 ft | Shade-tolerant | Medium | Zone 2b |
| black oak Quercus velutina | Tree | 80 ft | Sun–part shade | Medium | Zone 4a |
| black raspberry Rubus occidentalis | Shrub | 6 ft | Sun–part shade | Medium | Zone 4b |
| black walnut Juglans nigra | Tree | 100 ft | Sun | High | Zone 4b |
| black willow Salix nigra | Tree | 100 ft | Sun | High | Zone 1b |
| blackeyed Susan Rudbeckia hirta | Wildflower (forb) | 1 ft | Sun | Medium | Zone 5a |
| blackhaw Viburnum prunifolium | Tree | 16 ft | Shade-tolerant | Medium | Zone 4a |
| bluejoint Calamagrostis canadensis | Grass or grass-like | 4.9 ft | Sun | Medium | Zone 4a |
| blunt broom sedge Carex tribuloides | Grass or grass-like | 3 ft | Shade-tolerant | Medium | Zone 4b |
| boxelder Acer negundo | Tree | 60 ft | Shade-tolerant | Medium | Zone 2b |
| bristly buttercup Ranunculus hispidus | Wildflower (forb) | 2.5 ft | Shade-tolerant | Medium | Zone 4a |
| broadleaf cattail Typha latifolia | Wildflower (forb) | 5 ft | Sun–part shade | High | Zone 3b |
| bur oak Quercus macrocarpa | Tree | 100 ft | Sun–part shade | Medium | Zone 3b |
| Canada germander Teucrium canadense | Wildflower (forb) | 3.3 ft | Sun–part shade | High | Zone 3a |
| Canada goldenrod Solidago canadensis | Wildflower (forb) | 3.5 ft | Sun | Medium | Zone 3a |
| Canada wildrye Elymus canadensis | Grass or grass-like | 3 ft | Shade-tolerant | Medium | Zone 3a |
| Canadian horseweed Conyza canadensis | Wildflower (forb) | 5 ft | Sun | Medium | Zone 12b |
| Canadian milkvetch Astragalus canadensis | Wildflower (forb) | 6 in | Sun | Medium | Zone 3b |
| Carolina rose Rosa carolina | Shrub | 5 ft | Sun–part shade | Low | Zone 3a |
| chinquapin oak Quercus muehlenbergii | Tree | 70 ft | Sun | Medium | Zone 4a |
| cockspur hawthorn Crataegus crus-galli | Tree | 30 ft | Sun | Low | Zone 4a |
| common blue violet Viola sororia | Wildflower (forb) | 4 in | Sun–part shade | High | Zone 4b |
| common cowparsnip Heracleum maximum | Wildflower (forb) | 8 ft | Sun | High | Zone 3b |
| common duckweed Lemna minor | Wildflower (forb) | — | Sun | High | Zone 3b |
| common evening primrose Oenothera biennis | Wildflower (forb) | 5 ft | Sun | Medium | Zone 4b |
| common hackberry Celtis occidentalis | Tree | 60 ft | Shade-tolerant | Low | Zone 2b |
| common selfheal Prunella vulgaris | Wildflower (forb) | 1.5 ft | Sun–part shade | Medium | Zone 3b |
| common sneezeweed Helenium autumnale | Wildflower (forb) | 4.9 ft | Sun | Medium | Zone 3a |
| composite dropseed Sporobolus compositus | Grass or grass-like | 3 ft | Sun | Low | Zone 3b |
| coon's tail Ceratophyllum demersum | Wildflower (forb) | — | Sun–part shade | High | Zone 3b |
| coralberry Symphoricarpos orbiculatus | Shrub | 2 ft | Sun–part shade | High | Zone 5a |
| crested sedge Carex cristatella | Grass or grass-like | 3 ft | Shade-tolerant | High | Zone 4a |
| cup plant Silphium perfoliatum | Wildflower (forb) | 6 ft | Sun–part shade | — | Zone 2b |
| ditch stonecrop Penthorum sedoides | Wildflower (forb) | 2.6 ft | Sun–part shade | Medium | Zone 4b |
| dotted smartweed Polygonum punctatum | Wildflower (forb) | 3.2 ft | Sun | Medium | Zone 10b |
| downy yellow violet Viola pubescens | Wildflower (forb) | 1.3 ft | Shade-tolerant | Medium | Zone 4a |
| eastern narrowleaf sedge Carex amphibola | Grass or grass-like | 2 ft | Shade-tolerant | Medium | Zone 7a |
| eastern redcedar Juniperus virginiana | Tree | 50 ft | Sun–part shade | Low | Zone 3a |
| eastern woodland sedge Carex blanda | Grass or grass-like | 2 ft | Shade-tolerant | High | Zone 4b |
| fall panicgrass Panicum dichotomiflorum | Grass or grass-like | 3.3 ft | Sun | High | Zone 3a |
| field horsetail Equisetum arvense | Fern | 11 in | Sun–part shade | High | Zone 3a |
| fowl mannagrass Glyceria striata | Grass or grass-like | 5.7 ft | Shade-tolerant | Medium | Zone 3b |
| fox sedge Carex vulpinoidea | Grass or grass-like | 3.2 ft | Sun–part shade | Medium | Zone 3b |
| giant goldenrod Solidago gigantea | Wildflower (forb) | 8.2 ft | Sun–part shade | Medium | Zone 4a |
| gray dogwood Cornus racemosa | Shrub | 10 ft | Shade-tolerant | Medium | Zone 2b |
| greater straw sedge Carex normalis | Grass or grass-like | 5 ft | Shade-tolerant | High | Zone 4a |
| green ash Fraxinus pennsylvanica | Tree | 80 ft | Shade-tolerant | Medium | Zone 2b |
| green bulrush Scirpus atrovirens | Grass or grass-like | 5.9 ft | Sun | Medium | Zone 2a |
| groundnut Apios americana | Vine | 1 ft | Shade-tolerant | Medium | Zone 5a |
| hairy white oldfield aster Symphyotrichum pilosum | Wildflower (forb) | 3 ft | Shade-tolerant | Medium | Zone 4a |
| harvestlice Agrimonia parviflora | Wildflower (forb) | 6 ft | Sun–part shade | High | Zone 4a |
| honeylocust Gleditsia triacanthos | Tree | 70 ft | Sun | Medium | Zone 3b |
| hop sedge Carex lupulina | Grass or grass-like | 4.3 ft | Sun–part shade | Medium | Zone 3b |
| hophornbeam Ostrya virginiana | Tree | 45 ft | Shade-tolerant | Low | Zone 3b |
| Indiangrass Sorghastrum nutans | Grass or grass-like | 6 ft | Sun | Medium | Zone 3b |
| Indianhemp Apocynum cannabinum | Wildflower (forb) | 3.3 ft | Sun–part shade | High | Zone 3a |
| inland rush Juncus interior | Grass or grass-like | 3 ft | Sun–part shade | Medium | Zone 3b |
| Jack in the pulpit Arisaema triphyllum | Wildflower (forb) | 1.5 ft | Shade-tolerant | High | Zone 5b |
| Jerusalem artichoke Helianthus tuberosus | Wildflower (forb) | 9.8 ft | Sun–part shade | Low | Zone 3a |
| jewelweed Impatiens capensis | Wildflower (forb) | 4.9 ft | Shade-tolerant | Medium | Zone 10b |
| lanceleaf loosestrife Lysimachia lanceolata | Wildflower (forb) | 2.5 ft | Shade-tolerant | Medium | Zone 5a |
| leafy pondweed Potamogeton foliosus | Wildflower (forb) | — | Sun | High | Zone 3b |
| little barley Hordeum pusillum | Grass or grass-like | 1.2 ft | Sun | Medium | Zone 10b |
| littleleaf buttercup Ranunculus abortivus | Wildflower (forb) | 2.8 ft | Shade-tolerant | Medium | Zone 3a |
| Mexican muhly Muhlenbergia mexicana | Grass or grass-like | 3 ft | Sun–part shade | Medium | Zone 4a |
| mockernut hickory Carya tomentosa | Tree | 85 ft | Sun–part shade | Medium | Zone 4a |
| New Jersey tea Ceanothus americanus | Shrub | 3 ft | Shade-tolerant | Low | Zone 4b |
| northern maidenhair Adiantum pedatum | Fern | 1.3 ft | Shade-tolerant | Medium | Zone 3b |
| northern red oak Quercus rubra | Tree | 81 ft | Sun–part shade | Medium | Zone 3b |
| Ohio buckeye Aesculus glabra | Tree | 68 ft | Shade-tolerant | Medium | Zone 4a |
| pale purple coneflower Echinacea pallida | Wildflower (forb) | 1.2 ft | Sun | Medium | Zone 4a |
| pale touch-me-not Impatiens pallida | Wildflower (forb) | 8.2 ft | Shade-tolerant | Medium | Zone 10b |
| partridge pea Chamaecrista fasciculata | Wildflower (forb) | 2.4 ft | Shade-tolerant | Medium | Zone 7a |
| peachleaf willow Salix amygdaloides | Tree | 60 ft | Sun | High | Zone 4a |
| Pennsylvania smartweed Polygonum pensylvanicum | Wildflower (forb) | 3.9 ft | Sun | Medium | Zone 10b |
| Philadelphia fleabane Erigeron philadelphicus | Wildflower (forb) | 2.8 ft | Sun–part shade | Medium | Zone 4b |
| pinnate prairie coneflower Ratibida pinnata | Wildflower (forb) | 4 ft | Sun | Medium | Zone 3b |
| poverty rush Juncus tenuis | Grass or grass-like | 1.5 ft | Sun–part shade | Medium | Zone 3b |
| prairie blazing star Liatris pycnostachya | Wildflower (forb) | 3.5 ft | Sun | Medium | Zone 4a |
| prairie cordgrass Spartina pectinata | Grass or grass-like | 8 ft | Sun | High | Zone 3b |
| prairie crab apple Malus ioensis | Tree | 25 ft | Sun | Medium | Zone 4b |
| purple lovegrass Eragrostis spectabilis | Grass or grass-like | 11 in | Sun | Low | Zone 3a |
| purple prairie clover Dalea purpurea | Wildflower (forb) | 3 ft | Sun | Medium | Zone 3b |
| purpleleaf willowherb Epilobium coloratum | Wildflower (forb) | 3.3 ft | Sun–part shade | High | Zone 4a |
| purpletop tridens Tridens flavus | Grass or grass-like | 2.5 ft | Sun | Low | Zone 5a |
| quaking aspen Populus tremuloides | Tree | 65 ft | Sun | High | Zone 1a |
| quill sedge Carex tenera | Grass or grass-like | 2.5 ft | Shade-tolerant | Medium | Zone 4a |
| rattlesnake fern Botrychium virginianum | Fern | 1.4 ft | Shade-tolerant | Medium | Zone 3b |
| reed canarygrass Phalaris arundinacea | Grass or grass-like | 5 ft | Sun | High | Zone 3b |
| rice cutgrass Leersia oryzoides | Grass or grass-like | 4.9 ft | Sun | High | Zone 4a |
| riverbank grape Vitis riparia | Vine | 45 ft | Sun–part shade | Medium | Zone 4a |
| roughfruit amaranth Amaranthus tuberculatus | Wildflower (forb) | 6.6 ft | Sun | High | Zone 4a |
| rufous bulrush Scirpus pendulus | Grass or grass-like | 4 ft | Sun | Medium | Zone 3b |
| sago pondweed Stuckenia pectinata | Wildflower (forb) | — | Sun | High | Zone 3b |
| sawtooth sunflower Helianthus grosseserratus | Wildflower (forb) | 5 ft | Sun | Medium | Zone 3a |
| shagbark hickory Carya ovata | Tree | 75 ft | Sun–part shade | Medium | Zone 3a |
| sharpwing monkeyflower Mimulus alatus | Wildflower (forb) | 2.3 ft | Shade-tolerant | High | Zone 5a |
| shellbark hickory Carya laciniosa | Tree | 100 ft | Shade-tolerant | High | Zone 5a |
| Short's sedge Carex shortiana | Grass or grass-like | 3 ft | Sun–part shade | High | Zone 5b |
| silky dogwood Cornus amomum | Shrub | 10 ft | Sun–part shade | High | Zone 3b |
| silver maple Acer saccharinum | Tree | 90 ft | Sun–part shade | Medium | Zone 2b |
| slippery elm Ulmus rubra | Tree | 85 ft | Shade-tolerant | High | Zone 3a |
| smooth hedgenettle Stachys tenuifolia | Wildflower (forb) | 25 ft | Shade-tolerant | High | Zone 4a |
| smooth phlox Phlox glaberrima | Wildflower (forb) | 3 ft | Sun–part shade | High | Zone 4b |
| smooth sumac Rhus glabra | Tree | 12 ft | Sun | Low | Zone 4a |
| southern waternymph Najas guadalupensis | Wildflower (forb) | 1 ft | Sun | High | Zone 3b |
| spotted St. Johnswort Hypericum punctatum | Wildflower (forb) | 3 ft | Shade-tolerant | Medium | Zone 4a |
| spring avens Geum vernum | Wildflower (forb) | 1.6 ft | Shade-tolerant | Medium | Zone 5b |
| strawcolored flatsedge Cyperus strigosus | Grass or grass-like | 3.2 ft | Sun | Medium | Zone 4a |
| sugar maple Acer saccharum | Tree | 100 ft | Shade-tolerant | Medium | Zone 2b |
| swamp milkweed Asclepias incarnata | Wildflower (forb) | 4.9 ft | Sun | High | Zone 3b |
| switchgrass Panicum virgatum | Grass or grass-like | 5 ft | Sun | Medium | Zone 3a |
| tall cinquefoil Potentilla arguta | Wildflower (forb) | 3 ft | Sun–part shade | Medium | Zone 3b |
| tall hairy agrimony Agrimonia gryposepala | Wildflower (forb) | 5.9 ft | Sun–part shade | Medium | Zone 3a |
| teal lovegrass Eragrostis hypnoides | Grass or grass-like | 4 in | Sun | High | Zone 3b |
| threelobe beggarticks Bidens tripartita | Wildflower (forb) | 3.5 ft | Sun–part shade | High | Zone 12a |
| Virginia bluebells Mertensia virginica | Wildflower (forb) | 2.3 ft | Shade-tolerant | High | Zone 4b |
| Virginia creeper Parthenocissus quinquefolia | Vine | 1 ft | Sun–part shade | Low | Zone 4b |
| Virginia threeseed mercury Acalypha virginica | Wildflower (forb) | 3 ft | Sun–part shade | Medium | Zone 10b |
| Virginia wildrye Elymus virginicus | Grass or grass-like | 2.5 ft | Shade-tolerant | Medium | Zone 4b |
| water knotweed Polygonum amphibium | Wildflower (forb) | 1 in | Sun | High | Zone 5a |
| white ash Fraxinus americana | Tree | 90 ft | Sun | High | Zone 4a |
| white avens Geum canadense | Wildflower (forb) | 3.9 ft | Shade-tolerant | Medium | Zone 4a |
| white doll's daisy Boltonia asteroides | Wildflower (forb) | 8 ft | Sun–part shade | Medium | Zone 3b |
| white oak Quercus alba | Tree | 100 ft | Sun–part shade | Medium | Zone 3a |
| white panicle aster Symphyotrichum lanceolatum | Wildflower (forb) | 6 ft | Sun–part shade | High | Zone 3b |
| whitegrass Leersia virginica | Grass or grass-like | 3.9 ft | Shade-tolerant | Medium | Zone 3a |
| wild bergamot Monarda fistulosa | Wildflower (forb) | 4.9 ft | Sun–part shade | High | Zone 4a |
| wild blue phlox Phlox divaricata | Wildflower (forb) | 3 ft | Sun–part shade | Medium | Zone 4a |
| winter bentgrass Agrostis hyemalis | Grass or grass-like | 3.5 ft | Sun–part shade | High | Zone 4a |
| woodland bluegrass Poa sylvestris | Grass or grass-like | 3 ft | Shade-tolerant | High | Zone 4a |
| woolgrass Scirpus cyperinus | Grass or grass-like | 4.9 ft | Sun–part shade | High | Zone 4a |
No garden-ready natives match these filters. Try clearing one.
Other native species recorded here 155
PLANTS has no growing records for these, so light, moisture, height and zone filters cannot include them. Many are wild species seldom sold by nurseries.
Hidden while “Garden-ready only” is on.
- American bladdernut Staphylea trifolia
- American false pennyroyal Hedeoma pulegioides
- American lopseed Phryma leptostachya
- Aunt Lucy Ellisia nyctelea
- big devils beggartick Bidens vulgata
- blackseed plantain Plantago rugelii
- bloody butcher Trillium recurvatum
- blue skullcap Scutellaria lateriflora
- bluejacket Tradescantia ohiensis
- bluntleaf sandwort Moehringia lateriflora
- bluntlobe cliff fern Woodsia obtusa
- bottlebrush sedge Carex hystericina
- bottomland aster Symphyotrichum ontarionis
- bristly greenbrier Smilax tamnoides
- browneyed Susan Rudbeckia triloba
- button eryngo Eryngium yuccifolium
- Canada lettuce Lactuca canadensis
- Canadian anemone Anemone canadensis
- Canadian clearweed Pilea pumila
- Canadian honewort Cryptotaenia canadensis
- Canadian woodnettle Laportea canadensis
- Carolina horsenettle Solanum carolinense
- carpenter's square Scrophularia marilandica
- clammy groundcherry Physalis heterophylla
- clammy hedgehyssop Gratiola neglecta
- clasping Venus' looking-glass Triodanis perfoliata
- Clayton's sweetroot Osmorhiza claytonii
- climbing false buckwheat Polygonum scandens
- clustered blacksnakeroot Sanicula odorata
- common boneset Eupatorium perfoliatum
- common cinquefoil Potentilla simplex
- common milkweed Asclepias syriaca
- common moonseed Menispermum canadense
- common threeseed mercury Acalypha rhomboidea
- common yellow oxalis Oxalis stricta
- Culver's root Veronicastrum virginicum
- curlytop knotweed Polygonum lapathifolium
- cutleaf toothwort Cardamine concatenata
- Davis' sedge Carex davisii
- downy hawthorn Crataegus mollis
- dutchman's breeches Dicentra cucullaria
- dwarf larkspur Delphinium tricorne
- eastern bottlebrush grass Elymus hystrix
- eastern poison ivy Toxicodendron radicans
- elmleaf goldenrod Solidago ulmifolia
- erect knotweed Polygonum erectum
- evening campion Silene nivea
- feathery false lily of the valley Maianthemum racemosum
- feverwort Triosteum perfoliatum
- flowering spurge Euphorbia corollata
- foxtail barley Hordeum jubatum
- fragrant bedstraw Galium triflorum
- fringed loosestrife Lysimachia ciliata
- great blue lobelia Lobelia siphilitica
- great ragweed Ambrosia trifida
- Greek valerian Polemonium reptans
- green dragon Arisaema dracontium
- hairy wildrye Elymus villosus
- heavy sedge Carex gravida
- hedge false bindweed Calystegia sepium
- Heller's rosette grass Dichanthelium oligosanthes
- hemlock waterparsnip Sium suave
- hoary frostweed Helianthemum bicknellii
- hoary puccoon Lithospermum canescens
- hoary verbena Verbena stricta
- horned pondweed Zannichellia palustris
- Illinois ticktrefoil Desmodium illinoense
- Indian-tobacco Lobelia inflata
- inflated narrow-leaf sedge Carex grisea
- lanceleaf buckthorn Rhamnus lanceolata
- lanceleaf fogfruit Phyla lanceolata
- largebract ticktrefoil Desmodium cuspidatum
- largebracted plantain Plantago aristata
- lateflowering thoroughwort Eupatorium serotinum
- licorice bedstraw Galium circaezans
- longleaf groundcherry Physalis longifolia
- longstyle sweetroot Osmorhiza longistylis
- lowland bladderfern Cystopteris protrusa
- manyfruit primrose-willow Ludwigia polycarpa
- mayapple Podophyllum peltatum
- meadow garlic Allium canadense
- Mexican plum Prunus mexicana
- Missouri gooseberry Ribes missouriense
- neckweed Veronica peregrina
- New England aster Symphyotrichum novae-angliae
- nodding chickweed Cerastium nutans
- northern bugleweed Lycopus uniflorus
- obedient plant Physostegia virginiana
- pale dock Rumex altissimus
- palespike lobelia Lobelia spicata
- pear hawthorn Crataegus calpodendron
- Pennsylvania pellitory Parietaria pensylvanica
- pointedleaf ticktrefoil Desmodium glutinosum
- poverty dropseed Sporobolus vaginiflorus
- prairie groundsel Packera plattensis
- prairie ironweed Vernonia fasciculata
- prairie rosinweed Silphium terebinthinaceum
- prairie threeawn Aristida oligantha
- prairie violet Viola pedatifida
- purple meadow-rue Thalictrum dasycarpum
- red columbine Aquilegia canadensis
- Richardson's alumroot Heuchera richardsonii
- rosy sedge Carex rosea
- rough barnyardgrass Echinochloa muricata
- roundseed St. Johnswort Hypericum sphaerocarpum
- rue anemone Thalictrum thalictroides
- sensitive fern Onoclea sensibilis
- shining bedstraw Galium concinnum
- shortbeak arrowhead Sagittaria brevirostra
- shortbeak sedge Carex brevior
- showy orchid Galearis spectabilis
- silky dogwood Cornus obliqua
- slender wedgescale Sphenopholis intermedia
- slender yellow woodsorrel Oxalis dillenii
- small pondweed Potamogeton pusillus
- smartweed dodder Cuscuta polygonorum
- smooth oxeye Heliopsis helianthoides
- smooth Solomon's seal Polygonatum biflorum
- soft agrimony Agrimonia pubescens
- soft-hair marbleseed Onosmodium bejariense
- spotted geranium Geranium maculatum
- spotted sandmat Chamaesyce maculata
- spreading dogbane Apocynum androsaemifolium
- Standley's goosefoot Chenopodium standleyanum
- starry false lily of the valley Maianthemum stellatum
- swamp verbena Verbena hastata
- sweet coneflower Rudbeckia subtomentosa
- sweetscented joe pye weed Eutrochium purpureum
- tall thimbleweed Anemone virginiana
- tall thoroughwort Eupatorium altissimum
- tufted lovegrass Eragrostis pectinacea
- upright carrionflower Smilax ecirrhata
- variegated scouringrush Equisetum variegatum
- violet woodsorrel Oxalis violacea
- Virginia bunchflower Veratrum virginicum
- Virginia mountainmint Pycnanthemum virginianum
- Virginia pepperweed Lepidium virginicum
- Virginia plantain Plantago virginica
- Virginia springbeauty Claytonia virginica
- whip nutrush Scleria triglomerata
- white fawnlily Erythronium albidum
- white heath aster Symphyotrichum ericoides
- white snakeroot Ageratina altissima
- white vervain Verbena urticifolia
- whorled milkweed Asclepias verticillata
- whorled mountainmint Pycnanthemum verticillatum
- widowsfrill Silene stellata
- wild cucumber Echinocystis lobata
- wild yam Dioscorea villosa
- winged lythrum Lythrum alatum
- wingstem Verbesina alternifolia
- witchgrass Panicum capillare
- yellowfruit sedge Carex annectens
- yellowseed false pimpernel Lindernia dubia
- zigzag spiderwort Tradescantia subaspera
Also listed as native and introduced here 3
PLANTS labels these species both native and introduced in this state: some forms are native and others were brought in from elsewhere. Most gardeners should choose plants from the main list.
- annual ragweedAmbrosia artemisiifolia
- common reedPhragmites australis
- Kentucky bluegrassPoa pratensis
Compared with Illinois
The typical county is the median of the 102 Illinois counties with PLANTS county records; the statewide figure counts every species native anywhere in the state. More species is not better or worse: counties differ in size, habitat and how thoroughly they have been surveyed.
| Measure | Warren County | Typical county | Statewide |
|---|---|---|---|
| Native species | 301 | 641 | 1,909 |
| Garden-ready natives | 146 | 272 | 652 |
| Tree | 38 | — | 187 |
| Shrub | 10 | — | 96 |
| Wildflower (forb) | 179 | — | 1,015 |
| Grass or grass-like | 53 | — | 444 |
| Vine | 14 | — | 79 |
| Fern | 7 | — | 88 |
Neighboring counties
Counties that share a ZIP code with Warren County.
- Fulton County, IL 300 garden-ready
- Henderson County, IL 285 garden-ready
- Knox County, IL 217 garden-ready
- McDonough County, IL 304 garden-ready
- Mercer County, IL 169 garden-ready
Source & data date
- Source
- USDA NRCS PLANTS Database: county distribution records, native status and plant characteristics. CC0 (public domain dedication, per the data.gov catalog record).
- Kew’s World Checklist of Vascular Plants (WCVP): native or introduced status by state. CC BY 3.0.
- USGS US-RIIS (ver. 2.0): species listed as introduced are excluded. CC0.
- Citation
- USDA, NRCS. 2026. The PLANTS Database (https://plants.usda.gov, 11/04/2026). National Plant Data Team, Greensboro, NC USA.
- Govaerts R. (ed.) (2026). WCVP: World Checklist of Vascular Plants. Facilitated by the Royal Botanic Gardens, Kew. Data file dated 2026-06-04, http://sftp.kew.org/pub/data-repositories/WCVP/ (retrieved 2026-11-04). Paper: Govaerts R. et al. (2021) The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. Scientific Data 8, 215.
- Data date
- Retrieved from PLANTS on November 4, 2026; WCVP data file dated June 4, 2026.
- Zones
- USDA Plant Hardiness Zone Map (2023) ZIP table: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 3, 2026. Plant zones on this site are our estimate, not the official map.
- Scope
- Warren County (county FIPS 17187), Illinois. 301 native species from PLANTS county distribution records; garden-ready = species with a PLANTS characteristics record.
- Method
- A species is listed when it is recorded as native to the state in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in the county by USDA PLANTS. Species PLANTS labels both native and introduced are listed separately. Full method · All sources