60 wildflowers were recorded blooming in Arkansas in August in our iNaturalist sample; 14 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in August

Purple Passionflower

Buttonbush
Sharpwing Monkeyflower

American pokeweed
Cardinal Flower
American groundnut

Partridge Pea

Flowering Spurge

Frostweed

Yellow Passionflower

Crane-Fly Orchid

Bitterweed
All wildflowers blooming in Arkansas in August
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Purple Passionflower | Passiflora incarnata | Passionfruit Family | 129 | Jul (past peak) |
| 2 | Buttonbush | Cephalanthus occidentalis | madder family | 108 | Jul (past peak) |
| 3 | Sharpwing Monkeyflower | Mimulus alatus | lopseed family | 61 | Aug (peak) |
| 4 | American pokeweed | Phytolacca americana | Pokeweed Family | 54 | Jul (past peak) |
| 5 | Cardinal Flower | Lobelia cardinalis | bellflower family | 53 | Sep (rising) |
| 6 | American groundnut | Apios americana | Legumes | 49 | Aug (peak) |
| 7 | Partridge Pea | Chamaecrista fasciculata | Legumes | 49 | Aug (peak) |
| 8 | Flowering Spurge | Euphorbia corollata | Spurge Family | 47 | Aug (peak) |
| 9 | Frostweed | Verbesina virginica | Sunflowers, Daisies, Asters, and Allies | 46 | Sep (rising) |
| 10 | Yellow Passionflower | Passiflora lutea | Passionfruit Family | 44 | Jun (past peak) |
| 11 | Crane-Fly Orchid | Tipularia discolor | Orchids | 44 | Aug (peak) |
| 12 | Bitterweed | Helenium amarum | Sunflowers, Daisies, Asters, and Allies | 40 | Aug (peak) |
| 13 | Asiatic dayflower | Commelina communis | Spiderworts | 31 | Sep (rising) |
| 14 | American trumpet vine | Campsis radicans | bignonia family | 31 | Aug (peak) |
| 15 | Leafy Elephant's-Foot | Elephantopus carolinianus | Sunflowers, Daisies, Asters, and Allies | 31 | Sep (rising) |
| 16 | brown-eyed Susan | Rudbeckia triloba | Sunflowers, Daisies, Asters, and Allies | 28 | Jul (past peak) |
| 17 | Wild Potato Vine | Ipomoea pandurata | bindweed family | 26 | Jul (past peak) |
| 18 | Smooth Hedgenettle | Stachys tenuifolia | Mint Family | 26 | Jul (past peak) |
| 19 | American hog-peanut | Amphicarpaea bracteata | Legumes | 24 | Sep (rising) |
| 20 | Buttonweed | Diodia virginiana | madder family | 24 | Aug (peak) |
| 21 | Wingstem | Verbesina alternifolia | Sunflowers, Daisies, Asters, and Allies | 22 | Sep (rising) |
| 22 | Late Boneset | Eupatorium serotinum | Sunflowers, Daisies, Asters, and Allies | 21 | Sep (rising) |
| 23 | Common Jewelweed | Impatiens capensis | balsam family | 20 | Jun (past peak) |
| 24 | Hairy Ruellia | Ruellia humilis | Acanthus Family | 18 | Jun (past peak) |
| 25 | Tall Bellflower | Campanulastrum americanum | bellflower family | 18 | Jul (past peak) |
| 26 | Cup Plant | Silphium perfoliatum | Sunflowers, Daisies, Asters, and Allies | 17 | Aug (peak) |
| 27 | Autumn Clematis | Clematis terniflora | buttercup family | 16 | Aug (peak) |
| 28 | Plains Coreopsis | Coreopsis tinctoria | Sunflowers, Daisies, Asters, and Allies | 15 | Jun (past peak) |
| 29 | Pigeonwings | Clitoria mariana | Legumes | 15 | Jul (past peak) |
| 30 | Whitemouth Dayflower | Commelina erecta | Spiderworts | 14 | Jun (past peak) |
| 31 | American germander | Teucrium canadense | Mint Family | 14 | Jul (past peak) |
| 32 | Cutleaf Coneflower | Rudbeckia laciniata | Sunflowers, Daisies, Asters, and Allies | 14 | Aug (peak) |
| 33 | Great Blue Lobelia | Lobelia siphilitica | bellflower family | 14 | Sep (rising) |
| 34 | White Morning-glory | Ipomoea lacunosa | bindweed family | 14 | Sep (rising) |
| 35 | Carolina horsenettle | Solanum carolinense | nightshade family | 13 | Jun (past peak) |
| 36 | False Daisy | Eclipta prostrata | Sunflowers, Daisies, Asters, and Allies | 13 | Sep (rising) |
| 37 | black-eyed Susan | Rudbeckia hirta | Sunflowers, Daisies, Asters, and Allies | 12 | Jun (past peak) |
| 38 | American jumpseed | Persicaria virginiana | knotweed family | 12 | Aug (peak) |
| 39 | Lanceleaf Frogfruit | Phyla lanceolata | Verbena Family | 10 | Jul (past peak) |
| 40 | Blue Mistflower | Conoclinium coelestinum | Sunflowers, Daisies, Asters, and Allies | 10 | Sep (rising) |
| 41 | Butterfly Pea | Centrosema virginianum | Legumes | 10 | Jul (past peak) |
| 42 | Trailing Fuzzy-Bean | Strophostyles helvola | Legumes | 10 | Sep (rising) |
| 43 | Butterfly Milkweed | Asclepias tuberosa | Dogbane Family | 9 | Jun (past peak) |
| 44 | Indian tobacco | Lobelia inflata | bellflower family | 9 | Jul (past peak) |
| 45 | Spotted Knapweed | Centaurea stoebe | Sunflowers, Daisies, Asters, and Allies | 9 | Jul (past peak) |
| 46 | Common Boneset | Eupatorium perfoliatum | Sunflowers, Daisies, Asters, and Allies | 9 | Aug (peak) |
| 47 | St. Andrew's cross | Hypericum hypericoides | St. John's wort family | 9 | Jul (past peak) |
| 48 | Downy Rattlesnake Plantain | Goodyera pubescens | Orchids | 8 | Aug (peak) |
| 49 | American lotus | Nelumbo lutea | lotus family | 8 | Jul (past peak) |
| 50 | American water-willow | Justicia americana | Acanthus Family | 7 | May (past peak) |