Wildflowers Blooming in Illinois in September (60 Species)

60 wildflowers were recorded blooming in Illinois in September in our iNaturalist sample; 17 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.

Feb Mar Apr May Jun Jul Aug Sep Oct Nov

Top wildflowers in September

White Snakeroot245 obs.

Great Blue Lobelia235 obs.

New England aster225 obs.

Common Jewelweed169 obs.

Asiatic dayflower94 obs.

Common Sneezeweed87 obs.

Wingstem84 obs.

Chicory80 obs.

brown-eyed Susan76 obs.

Cardinal Flower69 obs.

fen grass of Parnassus69 obs.

Common Morning-Glory64 obs.

All wildflowers blooming in Illinois in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	White Snakeroot	Ageratina altissima	Sunflowers, Daisies, Asters, and Allies	245	Sep (peak)
2	Great Blue Lobelia	Lobelia siphilitica	bellflower family	235	Sep (peak)
3	New England aster	Symphyotrichum novae-angliae	Sunflowers, Daisies, Asters, and Allies	225	Sep (peak)
4	Common Jewelweed	Impatiens capensis	balsam family	169	Sep (peak)
5	Asiatic dayflower	Commelina communis	Spiderworts	94	Jul (past peak)
6	Common Sneezeweed	Helenium autumnale	Sunflowers, Daisies, Asters, and Allies	87	Sep (peak)
7	Wingstem	Verbesina alternifolia	Sunflowers, Daisies, Asters, and Allies	84	Aug (past peak)
8	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	80	Jul (past peak)
9	brown-eyed Susan	Rudbeckia triloba	Sunflowers, Daisies, Asters, and Allies	76	Aug (past peak)
10	Cardinal Flower	Lobelia cardinalis	bellflower family	69	Aug (past peak)
11	fen grass of Parnassus	Parnassia glauca	staff-vine family	69	Sep (peak)
12	Common Morning-Glory	Ipomoea purpurea	bindweed family	64	Sep (peak)
13	Obedient Plant	Physostegia virginiana	Mint Family	64	Aug (past peak)
14	American hog-peanut	Amphicarpaea bracteata	Legumes	64	Aug (past peak)
15	White Turtlehead	Chelone glabra	Plantain Family	59	Sep (peak)
16	Tall Goldenrod	Solidago altissima	Sunflowers, Daisies, Asters, and Allies	57	Sep (peak)
17	Cutleaf Coneflower	Rudbeckia laciniata	Sunflowers, Daisies, Asters, and Allies	51	Aug (past peak)
18	Pale Jewelweed	Impatiens pallida	balsam family	50	Aug (past peak)
19	Flower-Of-An-Hour	Hibiscus trionum	Mallow and Hibiscus Family	50	Sep (peak)
20	Partridge Pea	Chamaecrista fasciculata	Legumes	46	Aug (past peak)
21	Late Boneset	Eupatorium serotinum	Sunflowers, Daisies, Asters, and Allies	42	Sep (peak)
22	Tall Bellflower	Campanulastrum americanum	bellflower family	41	Jul (past peak)
23	Swamp Rose Mallow	Hibiscus moscheutos	Mallow and Hibiscus Family	39	Aug (past peak)
24	Wild Carrot	Daucus carota	carrot family	36	Jul (past peak)
25	Blue Mistflower	Conoclinium coelestinum	Sunflowers, Daisies, Asters, and Allies	36	Sep (peak)
26	Frost Aster	Symphyotrichum pilosum	Sunflowers, Daisies, Asters, and Allies	36	Sep (peak)
27	Red Clover	Trifolium pratense	Legumes	34	Jun (past peak)
28	Allegheny monkeyflower	Mimulus ringens	lopseed family	33	Jul (past peak)
29	White Morning-glory	Ipomoea lacunosa	bindweed family	33	Sep (peak)
30	Purple Loosestrife	Lythrum salicaria	lythrum family	31	Aug (past peak)
31	black-eyed Susan	Rudbeckia hirta	Sunflowers, Daisies, Asters, and Allies	31	Jun (past peak)
32	Pinkweed	Persicaria pensylvanica	knotweed family	30	Aug (past peak)
33	Field Thistle	Cirsium discolor	Sunflowers, Daisies, Asters, and Allies	29	Aug (past peak)
34	Calico Aster	Symphyotrichum lateriflorum	Sunflowers, Daisies, Asters, and Allies	29	Sep (peak)
35	Hedge Bindweed	Calystegia sepium	bindweed family	28	Jul (past peak)
36	Smooth Hedgenettle	Stachys tenuifolia	Mint Family	25	Jul (past peak)
37	Field Bindweed	Convolvulus arvensis	bindweed family	24	Jun (past peak)
38	Blue Vervain	Verbena hastata	Verbena Family	24	Jul (past peak)
39	Purple Coneflower	Echinacea purpurea	Sunflowers, Daisies, Asters, and Allies	23	Jul (past peak)
40	American pokeweed	Phytolacca americana	Pokeweed Family	22	Jul (past peak)
41	Common Selfheal	Prunella vulgaris	Mint Family	22	Jul (past peak)
42	Common Evening-Primrose	Oenothera biennis	evening primrose family	21	Sep (peak)
43	Purple Passionflower	Passiflora incarnata	Passionfruit Family	20	Aug (past peak)
44	Common Boneset	Eupatorium perfoliatum	Sunflowers, Daisies, Asters, and Allies	20	Aug (past peak)
45	Common Hibiscus	Hibiscus syriacus	Mallow and Hibiscus Family	20	Aug (past peak)
46	Wild Bergamot	Monarda fistulosa	Mint Family	19	Jul (past peak)
47	Fall Phlox	Phlox paniculata	phlox family	19	Aug (past peak)
48	Large-Leaved Aster	Eurybia macrophylla	Sunflowers, Daisies, Asters, and Allies	19	Sep (peak)
49	White Clover	Trifolium repens	Legumes	18	Jun (past peak)
50	False Sunflower	Heliopsis helianthoides	Sunflowers, Daisies, Asters, and Allies	17	Jul (past peak)