49 wildflowers were recorded blooming in South Dakota in September in our iNaturalist sample; 7 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in September
Curlycup Gumweed
Rocky Mountain Beeplant
Common Toadflax
Field Bindweed
Fireweed
Red Clover
Rubber Rabbitbrush
black-eyed Susan
Purple Crownvetch
Pearly Everlasting
Alfalfa
Great Mullein
All wildflowers blooming in South Dakota in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Curlycup Gumweed | Grindelia squarrosa | Sunflowers, Daisies, Asters, and Allies | 11 | Aug (past peak) |
| 2 | Rocky Mountain Beeplant | Cleomella serrulata | Spider Flower Family | 11 | Aug (past peak) |
| 3 | Common Toadflax | Linaria vulgaris | Plantain Family | 10 | Aug (past peak) |
| 4 | Field Bindweed | Convolvulus arvensis | bindweed family | 8 | Jun (past peak) |
| 5 | Fireweed | Chamaenerion angustifolium | evening primrose family | 7 | Jul (past peak) |
| 6 | Red Clover | Trifolium pratense | Legumes | 6 | Jul (past peak) |
| 7 | Rubber Rabbitbrush | Ericameria nauseosa | Sunflowers, Daisies, Asters, and Allies | 6 | Sep (peak) |
| 8 | black-eyed Susan | Rudbeckia hirta | Sunflowers, Daisies, Asters, and Allies | 6 | Jul (past peak) |
| 9 | Purple Crownvetch | Securigera varia | Legumes | 5 | Jul (past peak) |
| 10 | Pearly Everlasting | Anaphalis margaritacea | Sunflowers, Daisies, Asters, and Allies | 4 | Aug (past peak) |
| 11 | Alfalfa | Medicago sativa | Legumes | 4 | Jul (past peak) |
| 12 | Great Mullein | Verbascum thapsus | figwort family | 4 | Aug (past peak) |
| 13 | Western Harebell | Campanula petiolata | bellflower family | 4 | Jul (past peak) |
| 14 | Yellow Sweetclover | Melilotus officinalis | Legumes | 3 | Jul (past peak) |
| 15 | Common Sunflower | Helianthus annuus | Sunflowers, Daisies, Asters, and Allies | 3 | Jul (past peak) |
| 16 | White Sweetclover | Melilotus albus | Legumes | 3 | Jul (past peak) |
| 17 | Creeping Thistle | Cirsium arvense | Sunflowers, Daisies, Asters, and Allies | 3 | Jul (past peak) |
| 18 | Musk Thistle | Carduus nutans | Sunflowers, Daisies, Asters, and Allies | 3 | Jun (past peak) |
| 19 | White Campion | Silene latifolia | pink family | 3 | Aug (past peak) |
| 20 | New England aster | Symphyotrichum novae-angliae | Sunflowers, Daisies, Asters, and Allies | 3 | Sep (peak) |
| 21 | fen grass of Parnassus | Parnassia glauca | staff-vine family | 3 | Aug (past peak) |
| 22 | White Snakeroot | Ageratina altissima | Sunflowers, Daisies, Asters, and Allies | 3 | Sep (peak) |
| 23 | Asiatic dayflower | Commelina communis | Spiderworts | 2 | Sep (peak) |
| 24 | Hop Trefoil | Trifolium campestre | Legumes | 2 | Aug (past peak) |
| 25 | Purple Prairie Clover | Dalea purpurea | Legumes | 2 | Jul (past peak) |
| 26 | Daisy Fleabane | Erigeron strigosus | Sunflowers, Daisies, Asters, and Allies | 2 | Sep (peak) |
| 27 | spotted Joe-Pye weed | Eutrochium maculatum | Sunflowers, Daisies, Asters, and Allies | 2 | Aug (past peak) |
| 28 | Tall Bellflower | Campanulastrum americanum | bellflower family | 2 | Jul (past peak) |
| 29 | Bird's-Foot Trefoil | Lotus corniculatus | Legumes | 1 | Jul (past peak) |
| 30 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 1 | Jul (past peak) |
| 31 | Bull Thistle | Cirsium vulgare | Sunflowers, Daisies, Asters, and Allies | 1 | Aug (past peak) |
| 32 | Bittersweet Nightshade | Solanum dulcamara | nightshade family | 1 | Jun (past peak) |
| 33 | Common Tansy | Tanacetum vulgare | Sunflowers, Daisies, Asters, and Allies | 1 | Aug (past peak) |
| 34 | Oxeye Daisy | Leucanthemum vulgare | Sunflowers, Daisies, Asters, and Allies | 1 | Jul (past peak) |
| 35 | Garlic Mustard | Alliaria petiolata | mustard family | 1 | May (past peak) |
| 36 | Common Motherwort | Leonurus cardiaca | Mint Family | 1 | Jul (past peak) |
| 37 | Lewis flax | Linum lewisii | Flax Family | 1 | Jun (past peak) |
| 38 | Alsike clover | Trifolium hybridum | Legumes | 1 | Jul (past peak) |
| 39 | Allegheny monkeyflower | Mimulus ringens | lopseed family | 1 | Jul (past peak) |
| 40 | Buffalo-Bur | Solanum rostratum | nightshade family | 1 | Aug (past peak) |
| 41 | Wild Carrot | Daucus carota | carrot family | 1 | Aug (past peak) |
| 42 | Richardson's geranium | Geranium richardsonii | Geranium family | 1 | Jul (past peak) |
| 43 | Flower-Of-An-Hour | Hibiscus trionum | Mallow and Hibiscus Family | 1 | Aug (past peak) |
| 44 | Grey-Headed Coneflower | Ratibida pinnata | Sunflowers, Daisies, Asters, and Allies | 1 | Jul (past peak) |
| 45 | Cutleaf Coneflower | Rudbeckia laciniata | Sunflowers, Daisies, Asters, and Allies | 1 | Jul (past peak) |
| 46 | Prairie Phlox | Phlox pilosa | phlox family | 1 | Jun (past peak) |
| 47 | Partridge Pea | Chamaecrista fasciculata | Legumes | 1 | Sep (peak) |
| 48 | False Sunflower | Heliopsis helianthoides | Sunflowers, Daisies, Asters, and Allies | 1 | Aug (past peak) |
| 49 | Eastern Black Nightshade | Solanum emulans | nightshade family | 1 | Sep (peak) |