Wildflowers Blooming in Illinois in August (60 Species)

60 wildflowers were recorded blooming in Illinois in August in our iNaturalist sample; 23 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 August

American hog-peanut258 obs.

Partridge Pea228 obs.

Great Blue Lobelia200 obs.

Tall Bellflower158 obs.

Cardinal Flower152 obs.

Common Jewelweed136 obs.

Obedient Plant135 obs.

Allegheny monkeyflower133 obs.

Swamp Rose Mallow122 obs.

Wild Bergamot116 obs.

brown-eyed Susan114 obs.

Field Bindweed108 obs.

All wildflowers blooming in Illinois in August

#	Species	Scientific name	Family	Obs.	Peak in state
1	American hog-peanut	Amphicarpaea bracteata	Legumes	258	Aug (peak)
2	Partridge Pea	Chamaecrista fasciculata	Legumes	228	Aug (peak)
3	Great Blue Lobelia	Lobelia siphilitica	bellflower family	200	Sep (rising)
4	Tall Bellflower	Campanulastrum americanum	bellflower family	158	Jul (past peak)
5	Cardinal Flower	Lobelia cardinalis	bellflower family	152	Aug (peak)
6	Common Jewelweed	Impatiens capensis	balsam family	136	Sep (rising)
7	Obedient Plant	Physostegia virginiana	Mint Family	135	Aug (peak)
8	Allegheny monkeyflower	Mimulus ringens	lopseed family	133	Jul (past peak)
9	Swamp Rose Mallow	Hibiscus moscheutos	Mallow and Hibiscus Family	122	Aug (peak)
10	Wild Bergamot	Monarda fistulosa	Mint Family	116	Jul (past peak)
11	brown-eyed Susan	Rudbeckia triloba	Sunflowers, Daisies, Asters, and Allies	114	Aug (peak)
12	Field Bindweed	Convolvulus arvensis	bindweed family	108	Jun (past peak)
13	White Snakeroot	Ageratina altissima	Sunflowers, Daisies, Asters, and Allies	102	Sep (rising)
14	Swamp Milkweed	Asclepias incarnata	Dogbane Family	99	Jul (past peak)
15	Hedge Bindweed	Calystegia sepium	bindweed family	95	Jul (past peak)
16	Wingstem	Verbesina alternifolia	Sunflowers, Daisies, Asters, and Allies	89	Aug (peak)
17	Smooth Hedgenettle	Stachys tenuifolia	Mint Family	87	Jul (past peak)
18	Asiatic dayflower	Commelina communis	Spiderworts	86	Jul (past peak)
19	Blue Vervain	Verbena hastata	Verbena Family	86	Jul (past peak)
20	Wild Carrot	Daucus carota	carrot family	86	Jul (past peak)
21	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	85	Jul (past peak)
22	Flowering Spurge	Euphorbia corollata	Spurge Family	84	Aug (peak)
23	Purple Passionflower	Passiflora incarnata	Passionfruit Family	72	Aug (peak)
24	Purple Loosestrife	Lythrum salicaria	lythrum family	71	Aug (peak)
25	American groundnut	Apios americana	Legumes	71	Aug (peak)
26	Butterfly Milkweed	Asclepias tuberosa	Dogbane Family	69	Jun (past peak)
27	Pinkweed	Persicaria pensylvanica	knotweed family	69	Aug (peak)
28	Halberd-leaf Rosemallow	Hibiscus laevis	Mallow and Hibiscus Family	67	Aug (peak)
29	Purple Coneflower	Echinacea purpurea	Sunflowers, Daisies, Asters, and Allies	63	Jul (past peak)
30	Wild Potato Vine	Ipomoea pandurata	bindweed family	62	Jul (past peak)
31	Whorled Milkweed	Asclepias verticillata	Dogbane Family	62	Jul (past peak)
32	Cutleaf Coneflower	Rudbeckia laciniata	Sunflowers, Daisies, Asters, and Allies	59	Aug (peak)
33	Common Hibiscus	Hibiscus syriacus	Mallow and Hibiscus Family	58	Aug (peak)
34	Pale Jewelweed	Impatiens pallida	balsam family	55	Aug (peak)
35	Nodding Onion	Allium cernuum	amaryllis, onions, and allies	55	Aug (peak)
36	Grey-Headed Coneflower	Ratibida pinnata	Sunflowers, Daisies, Asters, and Allies	54	Jul (past peak)
37	Cup Plant	Silphium perfoliatum	Sunflowers, Daisies, Asters, and Allies	53	Aug (peak)
38	Field Thistle	Cirsium discolor	Sunflowers, Daisies, Asters, and Allies	52	Aug (peak)
39	black-eyed Susan	Rudbeckia hirta	Sunflowers, Daisies, Asters, and Allies	45	Jun (past peak)
40	American pokeweed	Phytolacca americana	Pokeweed Family	44	Jul (past peak)
41	Common Selfheal	Prunella vulgaris	Mint Family	43	Jul (past peak)
42	Carolina horsenettle	Solanum carolinense	nightshade family	43	Jul (past peak)
43	Common Sneezeweed	Helenium autumnale	Sunflowers, Daisies, Asters, and Allies	42	Sep (rising)
44	Fall Phlox	Phlox paniculata	phlox family	42	Aug (peak)
45	Hoary Vervain	Verbena stricta	Verbena Family	41	Jul (past peak)
46	Red Clover	Trifolium pratense	Legumes	39	Jun (past peak)
47	American jumpseed	Persicaria virginiana	knotweed family	39	Aug (peak)
48	Flower-Of-An-Hour	Hibiscus trionum	Mallow and Hibiscus Family	38	Sep (rising)
49	Prickly Cucumber	Echinocystis lobata	gourd family	36	Aug (peak)
50	Bull Thistle	Cirsium vulgare	Sunflowers, Daisies, Asters, and Allies	36	Aug (peak)