Deep Swamps (mostly 14, Costal Plain Division)

1. Taxodium distichum (bald cypress) 1, 2, 3, 4, 5
2. Acer rubrum (red maple) 1, 2, 3
3. Nyssa aquatica (tupelo) 1
4. Celtis laevigata (sugarberry) 1, 2, 3
5. Decodon verticillatum (water willow) 1, 2
6. Cephalanthus occidentalis (buttonbush) 1, 2 
7. Rosa palustris (swamp rose) 1
8. Itea virginica (Virginia willow) 1, 2, 3
9. Limnobium spongia (sponge plant) 1, 2
10. Acorus americanus (sweet flag) 1
11. Sparganium androcladum (bur-reed) 1
12. Justicia americana (water willow) 1
13. Carex grayi (Gray's sedge) 1
14. Carex frankii (Frank's sedge) 1
15. Hibiscus lasiocarpus (swamp mallow) 1
16. Lemna minor (duckweed) 1
17. Lobelia cardinalis (cardinal flower) 1, 2
18. Cuscuta gronovii (dodder) 1, 2

Bottomland Forests (11c, Ozark Division e.g. La Rue Pine Hills; 10 Wabash Border Division)

1. Populus deltoides (cottonwood) 1
2. Platanus occidentalis (sycamore) 1
3. Acer saccharinum (silver maple) 1
4. Gleditsia triacanthos (honey locust) 1, 2
5.  Quercus falcata var. pagodaefolia (cherrybark oak) 1, 2
6.  Quercus palustris (pin oak) 1, 2
7. Carya illinoensis (pecan) 1
8. Morus rubra (red mulberry) 1, 2
9. Penthorum sedoides (ditch stonecrop) 1, 2
10. Asclepias perennis (swamp milkweed) 1, 2, 3
11. Hypericum mutilum (dwarf St. John's-wort) 1, 2
12. Lindera benzoin (spicebush) 1, 2
13. Mimulus alatus (winged monkey flower) 1
14. Agastache nepetoides (giant hyssop) 1
15. Lindernia dubia (false pimpernel) 1
16. Ranunuculus septentrionalis (swamp buttercup) 1, 2
17. Lysimachia ciliata (fringed loosestrife) 1
18. Frasera caroliniensis (columbo) 1, 2, 3, 4, 5
19. Spigelia marilandica (Indian Pink) 1, 2
20. Polymnia uvedalia (bear's foot, yellow leafcup) 1
21. Saururus cernuus (lizard tail) 1, 2
22. Pilea pumila (clearweed) 1
23. Boehmeria cylindrica (false nettle) 1, 2
24. Arisaema dracontium (green dragon) 1, 2, 3
25. Hydrophyllum macrophyllum (large leaf waterleaf) 1
26. Silene regia (royal catchfly) 1
27. Aristolochia tomentosa (Dutchman's pipe-vine) 1, 2, 3
28. Campsis radicans (Virginia creeper) 1
29. Bignonia capreolata (cross-vine) 1, 2, 3
30. Rhus toxicodendron [or Toxicodendron radicans] (poison ivy) 1, 2
31. Menispermum canadense (moonseed) 1, 2
32. Smilax hispida (greenbriar) 1
33. Panicum boscii (panic grass) 1, 2
34. Eragrostis spectabilis (tumble-grass) 1, 2
35. Phoradendron serotinum (mistletoe) 1

Ravines

1. Lindera benzoin (spicebush) 1, 2
2. Asimina triloba (pawpaw) 1, 2, 3
3. Staphylea trifolia (bladdernut) 1, 2
4. Dicentra cucullaria (Dutchman's breeches) 1, 2
5. Trilium recurvatum (trillium, wake robin) 1, 2
6. Sanguinaria canadensis (bloodroot) 1, 2, 3
7. Stylophorum diphyllum (celandine poppy) 1, 2
8. Thalictrum thalictroides (rue anemone) 1, 2
9. Collinsia verna (blue-eyed Mary) 1, 2
10. Hepatica americana (liver-leaf) 1, 2, 3
11. Corallorhiza wisteriana (coral-root orchid) 1, 2, 3
12. Aplectrum hyemale (puttyroot orchid) 1, 2, 3
13. Goodyera pubescens (rattlesnake orchid) 1, 2
14. Mitella diphylla (bishop's cap) 1, 2
15. Saxifraga forbesii (Forbes' saxifrage) 1
16. Erythronium americanum (trout lily) 1
17. Mitchella repens (partridge berry) 1
18. Dodecatheon frenchii (French's shooting-star) 1

Seepages

1. Iris fulva (swamp red iris) 1
2. Carex frankii (Frank's sedge) 1
3. Allium canadense (wild onion) 1, 2
4. Hedyotis pusilla (small bluets) 1, 2
5. Ludwigia alternifolia (seedbox) 1
6. Isoetes butleri (quillwort) 1
7. Eleocharis acicularis (spike rush) 1, 2
8. Carex crinita (sedge) 1, 2
9. Chelone glabra (turtlehead) 1
10. Sagittaria latifolia (arrowhead) 1
11. Alisma plantago-aquatica (water plantain) 1, 2

Wet Roadsides and Ditches (including some weedy species)

1. Amaranthus arenicola (Torey's amaranth) 1
2. Echinochloa crus-gali (barnyard grass) 1, 2
3. Lapsana communis (nipplewort) 1
4. Eclipta prostrata (yerba de tajo) 1
5. Bidens aristosa (swamp marigold, tickseed sunflower) 1, 2
6. Verbesina alternifolia (yellow ironweed) 1, 2
7. Myosotis arvensis (field scorpion grass) 1
8. Ranunculus acris (tall buttercup) 1, 2
9. Rorippa sylvestris (creeping yellowcress) 1, 2
10. Commelina communis (common day flower) 1
11. Convolvulus sepium (American bindweed) 1
12. Lobelia siphilitica (blue cardinal-flower) 1
13. Euphorbia corollata (flowering spurge) 1
14. Chamaesyce supina (milk spurge) 1
15. Vicia angustifolia (common vetch) 1
16. Trifolium pratense (red clover) 1
17. Ammannia coccinea (long-leaved ammania) 1, 2
18. Scutellaria lateriflora (mad-dog skullcap) 1
19. Lindernia dubia (false pimpernel) 1
20. Penthorum sedoides (ditch stonecrop) 1
21. Rotala romosior (tooth-cup) 1, 2
22. Rumex crispus (curly dock) 1
23. Polygonum convolvulus (black bindweed) 1
24. Physalis angulata (ground cherry) 1, 2
25. Valerianella radiata (corn salad) 1

Sandstone rock ledges, e.g. Ferne Cliffe State Park, Giant City State Park, Garden of the Gods State Park with Pounds sandstone (1, 2), also here is sandstone with iron inclusions forms liesegang rings (1).
Limestone rock ledges, e.g. Pine Hills, showing Bailey limestone with chert [Devonian] (1), Fountain Bluff (1), Little Grand Canyon (1)

1. Juniperus virginiana (red cedar) 1
2. Ulmus alata (winged elm)
3. Vaccinium arboreum (farkleberry) 1
4. Vaccinium pallidum (low-bush blueberry) 1
5. Opuntia humifusa (prickly pear cactus) 1
6. Agave virginica (American aloe) 1
7. Danthonia spicata (poverty oat grass)
8. Phlox bifida (cleft phlox) 1
9. Liatris cylindracea (blazing star) 1
10. Stylosanthes biflora (pencil flower)
11. Antennaria sp. (pussy-toes)
12. Krigia biflora (false dandelion) 1, 2
13. Nothoscordum bivalve (false wild garlic)
14. Cunila origanoides (dittany)
15. Lespedeza hirta (hairy bush clover) 1
16. Heuchera micrantha (alumroot) 1, 2
17. Aquilegia canadensis (columbine) 1
18. Sedum pulchellum (widow's cross) 1, 2
19. Hypericum stragulum (St. Andrew's cross) 1
20. Asclepias meadii (Mead's milkweed) 1, 2
21. Chasmanthium latifolium (sea oats) 1
22. Cheilanthes lanosa [= C. vestida] (wooly lip-fern) 
23. Woodsia obtusa (woods fern) 1
24. Polytrichum commune (moss, shown with Cladina rangiferina, a lichen) 1, 2

Moist Rock Walls

1. Conacephalum conicum (a liverwort) 1
2. Pellia epiphylla (a liverwort) 1
3. Huperzia lucidula (shining clubmoss) 1, 2
4. Asplenium rhizophyllum (walking-fern) 1
5. Asplenium pinnatifidum (spleenwort) 1
6. Polypodium virginianum (Virginia polypody) 1
7. Dennstaedtia punctulobula (hay-scented fern) 1, 2
8. Osmunda regalis (royal fern) 1

Cave-like Overhanging Rocks

Sink-hole Ponds (Union, Randolph, Hardin Cos.)

Bluffs along Ohio and Mississippi Rivers

1. Rhamnus caroliniana (buckthorn) 1
2. Celtis pumila (dwarf hackberry) 
3. Fraxinus quadrangulata (blue ash)
4. Campsis radicans (Virginia creeper) 1
5. Bignonia capreolata (cross-vine) 1, 2, 3
6. Sicyos angulatus (bur cucumber) 1, 2, 3
7. Cocculus carolinus (snail-seed) 1, 2, 3, 4
8. Calycocarpum lyonii (cupseed) 
9. Aristolochia tomentosa (Dutchman's pipe-vine) 1, 2, 3
10.  Pellaea atropurpurea (cliff-brake) 1
11. Cystopteris bulbifera (bulblet bladder-fern) 1

Lowland Grass Community (9, Southern Till Plain Division, tallgrass prairie; only a few shown).  

For other web pages on Illinois prairies, see list compiled by Ken Robertson here.

1. Andropogon gerardii (big bluestem, turkey foot) 1, 2, 3
2. Sorghastrum nutans (Indian grass) 1
3. Solidago speciosa (goldenrod) [with Aster novae-angliae] 1
4. Apocynum sibiricum (Indian hemp) 1

Hill Prairies (Upland Grass; along Mississippi River, Johnson, Pope and Saline cos.)

1. Quercus stellata (post oak) 1
2. Elymus hystrix [= Hystrix patula] (bottlebrush grass) 1
3. Bouteloua curtipendula (side-oats grama) 1*
4. Koeleria cristata (June grass) 
5. Rhus copalina (dwarf sumac) 1
6. Rhus glabra (smooth sumac) 1
7. Ruellia humilis (wild petunia) 1
8. Echinacea pallida (pale coneflower) 1
9. Rudbeckia hirta (black-eyed Susan) 1, 2
10. Verbesina alternifolia (yellow ironweed) 1, 2
11. Liatris cylindracea (blazing star) 1
12.  Chamaecrista fasciculata (partridge pea) 1, 2
13. Sisyrinchium angustifolium (blue-eyed grass) 1, 2
14. Physostegia virginiana (false dragonhead) 1, 2
15. Dalea purpurea (purple prairie clover) 1, 2, 3
16. Asclepias tuberosa (butterfly weed) 1, 2
17. Tradescantia virginica (spiderwort) 1, 2
18. Verbena canadensis (wild vervain) 1, 2
19. Anemone virginiana (tall anemone) 1, 2
20. Fragaria virginiana (wild strawberry) 1

Upland Forests (13a and b, Shawnee Hills Division)

1. Fagus grandifolia (beech) 1, 2, 3, 4, 5
2. Acer saccharum (sugar maple) 1, 2, 3
3. Quercus alba (white oak) 1
4. Quercus velutina (black oak) 1, 2
5. Quercus muhlenbergii [= Q. prinoides] (chestnut oak) 1
6. Quercus macrocarpa (overcup oak) 1
7. Liriodendron tulipifera (tulip poplar) 1
8. Nyssa sylvatica (black gum) 1
9. Carya ovata (shagbark hickory) 1
10. Carya cordiformis (bitternut hickory) 1
11. Carya glabra (pignut hickory) 1
12. Fraxinus americana (white ash) 1
13. Ulmus rubra (slippery elm) 1
14. Ulmus americana (American elm) 1
15. Juglans nigra (black walnut) 1, 2, 3
16. Sassafras albidum (sassafras) 1, 2, 3
17. Diospyros virginiana (persimmon) 1, 2
18. Tilia americana (American basswood) 1, 2, 3, 4
19. Celtis occidentalis (hackberry)
20. Ostrya virginiana (hop hornbeam) 1, 2, 3
21. Carpinus caroliniana (blue beech, ironwood) 1, 2
22. Prunus serotina (black cherry) 1, 2,  3

Shrubs

1. Corylus americana (hazelnut) 1
2. Rhus aromatica (fragrant sumac) 1, 2, 3
3. Viburnum rufidulum (southern black haw, rusty nannyberry) 1
4. Hydrangea arborescens (wild hydrangea) 1
5. Sambucus canadensis (elderberry) 1

Herbs

1. Polystichum acrostichoides (Christmas fern) 1, 2
2. Botrychium virginianum (rattlesnake fern) 1, 2
3. Botrychium dissectum var. obliquum (grape fern) 1 and compared with above 2
4. Athyrium felix-femina (lady fern) 1
5. Adiantum pedatum (maidenhair fern) 1
6. Monotropa uniflora (Indian pipe) 1, 2, 3
7. Epifagus virginiana (beechdrops) 1, 2
8. Triosteum angustifolium (yellow flowered horse gentian) 1
9. Cynoglossum officinale (common hound's-tongue) 1, 2
10. Carex davisii (sedge) 1
11. Geranium maculatum (wild geranium) 1
12. Monarda bradburniana (beebalm) 1, 2
13. Circaea quadrisulcata [= C. lutetiana] (enchanter's nightshade) 1
14. Liparis liliifolia (orchid) 1, 2
15. Maianthemum racemosum (false Solomon's seal) 1, 2
16. Phryma leptostachya (lopseed) 1
17. Ranunuculus recurvatus (recurved buttercup) 1, 2