Wildflowers Blooming in Oklahoma in September (60 Species)

60 wildflowers were recorded blooming in Oklahoma in September in our iNaturalist sample; 20 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

Top wildflowers in September

Cardinal Flower215 obs.

Common Sunflower166 obs.

Cowpen Daisy109 obs.

Asiatic dayflower43 obs.

Flowering Spurge37 obs.

Green Antelopehorns36 obs.

Buttonbush34 obs.

Whitemouth Dayflower34 obs.

Purple Passionflower31 obs.

Frostweed25 obs.

Late Boneset24 obs.

Blue Mistflower23 obs.

All wildflowers blooming in Oklahoma in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Cardinal Flower	Lobelia cardinalis	bellflower family	215	Sep (peak)
2	Common Sunflower	Helianthus annuus	Sunflowers, Daisies, Asters, and Allies	166	Sep (peak)
3	Cowpen Daisy	Verbesina encelioides	Sunflowers, Daisies, Asters, and Allies	109	Oct (rising)
4	Asiatic dayflower	Commelina communis	Spiderworts	43	Sep (peak)
5	Flowering Spurge	Euphorbia corollata	Spurge Family	37	Sep (peak)
6	Green Antelopehorns	Asclepias viridis	Dogbane Family	36	May (past peak)
7	Buttonbush	Cephalanthus occidentalis	madder family	34	Jul (past peak)
8	Whitemouth Dayflower	Commelina erecta	Spiderworts	34	Jun (past peak)
9	Purple Passionflower	Passiflora incarnata	Passionfruit Family	31	Jul (past peak)
10	Frostweed	Verbesina virginica	Sunflowers, Daisies, Asters, and Allies	25	Sep (peak)
11	Late Boneset	Eupatorium serotinum	Sunflowers, Daisies, Asters, and Allies	24	Sep (peak)
12	Blue Mistflower	Conoclinium coelestinum	Sunflowers, Daisies, Asters, and Allies	23	Sep (peak)
13	Purple Groundcherry	Quincula lobata	nightshade family	16	May (past peak)
14	Butterfly Milkweed	Asclepias tuberosa	Dogbane Family	15	Jun (past peak)
15	White Morning-glory	Ipomoea lacunosa	bindweed family	15	Sep (peak)
16	Swamp Milkweed	Asclepias incarnata	Dogbane Family	14	Aug (past peak)
17	Wingstem	Verbesina alternifolia	Sunflowers, Daisies, Asters, and Allies	13	Sep (peak)
18	Autumn Clematis	Clematis terniflora	buttercup family	11	Sep (peak)
19	American hog-peanut	Amphicarpaea bracteata	Legumes	11	Sep (peak)
20	Buttonweed	Diodia virginiana	madder family	11	Sep (peak)
21	Sharpwing Monkeyflower	Mimulus alatus	lopseed family	11	Sep (peak)
22	Firewheel	Gaillardia pulchella	Sunflowers, Daisies, Asters, and Allies	10	May (past peak)
23	Giant Ragweed	Ambrosia trifida	Sunflowers, Daisies, Asters, and Allies	10	Sep (peak)
24	False Daisy	Eclipta prostrata	Sunflowers, Daisies, Asters, and Allies	10	Sep (peak)
25	Bitterweed	Helenium amarum	Sunflowers, Daisies, Asters, and Allies	8	Oct (rising)
26	Trailing Fuzzy-Bean	Strophostyles helvola	Legumes	8	Aug (past peak)
27	Buffalo-Bur	Solanum rostratum	nightshade family	7	Aug (past peak)
28	Common Hibiscus	Hibiscus syriacus	Mallow and Hibiscus Family	7	Sep (peak)
29	Camphorweed	Heterotheca subaxillaris	Sunflowers, Daisies, Asters, and Allies	6	Sep (peak)
30	White Snakeroot	Ageratina altissima	Sunflowers, Daisies, Asters, and Allies	6	Sep (peak)
31	Hairy Ruellia	Ruellia humilis	Acanthus Family	6	Jul (past peak)
32	American trumpet vine	Campsis radicans	bignonia family	5	Aug (past peak)
33	Crowpoison	Nothoscordum bivalve	amaryllis, onions, and allies	5	Mar (past peak)
34	Asian mazus	Mazus pumilus	mazus family	5	Sep (peak)
35	Partridge Pea	Chamaecrista fasciculata	Legumes	5	Aug (past peak)
36	Shaggy Portulaca	Portulaca pilosa	purslane family	5	Aug (past peak)
37	Yellow Passionflower	Passiflora lutea	Passionfruit Family	4	Jul (past peak)
38	Carolina horsenettle	Solanum carolinense	nightshade family	4	May (past peak)
39	American germander	Teucrium canadense	Mint Family	4	Jun (past peak)
40	Plains Coreopsis	Coreopsis tinctoria	Sunflowers, Daisies, Asters, and Allies	4	Jun (past peak)
41	Winecup Mallow	Callirhoe involucrata	Mallow and Hibiscus Family	4	May (past peak)
42	American pokeweed	Phytolacca americana	Pokeweed Family	3	May (past peak)
43	Purple Coneflower	Echinacea purpurea	Sunflowers, Daisies, Asters, and Allies	3	Jun (past peak)
44	Japanese honeysuckle	Lonicera japonica	honeysuckle family	3	May (past peak)
45	Tall Goldenrod	Solidago altissima	Sunflowers, Daisies, Asters, and Allies	3	Oct (rising)
46	Violet Woodsorrel	Oxalis violacea	Woodsorrel Family	3	Apr (past peak)
47	Pigeonwings	Clitoria mariana	Legumes	3	Jul (past peak)
48	Leafy Elephant's-Foot	Elephantopus carolinianus	Sunflowers, Daisies, Asters, and Allies	3	Aug (past peak)
49	Santa Maria feverfew	Parthenium hysterophorus	Sunflowers, Daisies, Asters, and Allies	3	Sep (peak)
50	Common Jewelweed	Impatiens capensis	balsam family	2	Jul (past peak)