60 wildflowers were recorded blooming in Arkansas in May in our iNaturalist sample; 29 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in May

Redring Milkweed

Chinese privet

Fire Pink

Poison Hemlock

Four-Leaved Milkweed

Partridgeberry

black-eyed Susan

Common Selfheal
Green Antelopehorns
American persimmon

Goat's Rue

Butterfly Milkweed
All wildflowers blooming in Arkansas in May
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Redring Milkweed | Asclepias variegata | Dogbane Family | 234 | May (peak) |
| 2 | Chinese privet | Ligustrum sinense | olive family | 141 | May (peak) |
| 3 | Fire Pink | Silene virginica | pink family | 103 | Apr (past peak) |
| 4 | Poison Hemlock | Conium maculatum | carrot family | 77 | May (peak) |
| 5 | Four-Leaved Milkweed | Asclepias quadrifolia | Dogbane Family | 71 | May (peak) |
| 6 | Partridgeberry | Mitchella repens | madder family | 69 | May (peak) |
| 7 | black-eyed Susan | Rudbeckia hirta | Sunflowers, Daisies, Asters, and Allies | 62 | Jun (rising) |
| 8 | Common Selfheal | Prunella vulgaris | Mint Family | 59 | May (peak) |
| 9 | Green Antelopehorns | Asclepias viridis | Dogbane Family | 59 | May (peak) |
| 10 | American persimmon | Diospyros virginiana | persimmon family | 48 | May (peak) |
| 11 | Goat's Rue | Tephrosia virginiana | Legumes | 45 | May (peak) |
| 12 | Butterfly Milkweed | Asclepias tuberosa | Dogbane Family | 40 | Jun (rising) |
| 13 | Purple Milkweed | Asclepias purpurascens | Dogbane Family | 40 | May (peak) |
| 14 | Red Columbine | Aquilegia canadensis | buttercup family | 38 | Apr (past peak) |
| 15 | Carolina horsenettle | Solanum carolinense | nightshade family | 38 | Jun (rising) |
| 16 | Oxeye Daisy | Leucanthemum vulgare | Sunflowers, Daisies, Asters, and Allies | 37 | May (peak) |
| 17 | Foxglove Beardtongue | Penstemon digitalis | Plantain Family | 37 | May (peak) |
| 18 | American water-willow | Justicia americana | Acanthus Family | 36 | May (peak) |
| 19 | White Fringetree | Chionanthus virginicus | olive family | 36 | Apr (past peak) |
| 20 | Deptford pink | Dianthus armeria | pink family | 36 | May (peak) |
| 21 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 34 | May (peak) |
| 22 | Musk Thistle | Carduus nutans | Sunflowers, Daisies, Asters, and Allies | 33 | May (peak) |
| 23 | Ohio spiderwort | Tradescantia ohiensis | Spiderworts | 33 | May (peak) |
| 24 | clasping Venus's looking glass | Triodanis perfoliata | bellflower family | 32 | May (peak) |
| 25 | Summer Bluet | Houstonia purpurea | madder family | 31 | May (peak) |
| 26 | Japanese honeysuckle | Lonicera japonica | honeysuckle family | 30 | May (peak) |
| 27 | Prairie Phlox | Phlox pilosa | phlox family | 30 | Apr (past peak) |
| 28 | Wild Carrot | Daucus carota | carrot family | 29 | Jun (rising) |
| 29 | Pinkladies | Oenothera speciosa | evening primrose family | 28 | Apr (past peak) |
| 30 | Sulphur Cinquefoil | Potentilla recta | rose family | 28 | May (peak) |
| 31 | Multiflora Rose | Rosa multiflora | rose family | 28 | May (peak) |
| 32 | Field madder | Sherardia arvensis | madder family | 27 | Apr (past peak) |
| 33 | American pokeweed | Phytolacca americana | Pokeweed Family | 27 | Jul (rising) |
| 34 | Cutleaf Evening Primrose | Oenothera laciniata | evening primrose family | 26 | May (peak) |
| 35 | Red Buckeye | Aesculus pavia | soapberry family | 26 | Apr (past peak) |
| 36 | Venus's looking-glass | Triodanis biflora | bellflower family | 25 | May (peak) |
| 37 | Ribwort Plantain | Plantago lanceolata | Plantain Family | 22 | Jun (rising) |
| 38 | Lyreleaf Sage | Salvia lyrata | Mint Family | 22 | Apr (past peak) |
| 39 | Purple Passionflower | Passiflora incarnata | Passionfruit Family | 21 | Jul (rising) |
| 40 | Rabbitfoot Clover | Trifolium arvense | Legumes | 20 | May (peak) |
| 41 | Solomon's plume | Maianthemum racemosum | agave and allies | 19 | May (peak) |
| 42 | White Clover | Trifolium repens | Legumes | 19 | Apr (past peak) |
| 43 | Carolina rose | Rosa carolina | rose family | 19 | May (peak) |
| 44 | Smooth Sumac | Rhus glabra | Cashew Family | 18 | Jun (rising) |
| 45 | Narrowleaf Mountainmint | Pycnanthemum tenuifolium | Mint Family | 18 | Jun (rising) |
| 46 | Red Clover | Trifolium pratense | Legumes | 17 | May (peak) |
| 47 | Carolina crane's-bill | Geranium carolinianum | Geranium family | 17 | Apr (past peak) |
| 48 | Moth Mullein | Verbascum blattaria | figwort family | 17 | May (peak) |
| 49 | Crimson Clover | Trifolium incarnatum | Legumes | 17 | Apr (past peak) |
| 50 | Plains Coreopsis | Coreopsis tinctoria | Sunflowers, Daisies, Asters, and Allies | 17 | Jun (rising) |