60 wildflowers were recorded blooming in Missouri in May in our iNaturalist sample; 28 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in May

Multiflora Rose

Miami Mist

Red Columbine

Poison Hemlock
Tall Blue Wild Indigo
common star-of-Bethlehem

Fire Pink

Common Pawpaw

Purple Milkweed
Green Antelopehorns

Purple Rocket
Common Hoptree
All wildflowers blooming in Missouri in May
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Multiflora Rose | Rosa multiflora | rose family | 203 | May (peak) |
| 2 | Miami Mist | Phacelia purshii | borage family | 159 | Apr (past peak) |
| 3 | Red Columbine | Aquilegia canadensis | buttercup family | 152 | May (peak) |
| 4 | Poison Hemlock | Conium maculatum | carrot family | 120 | May (peak) |
| 5 | Tall Blue Wild Indigo | Baptisia australis | Legumes | 116 | May (peak) |
| 6 | common star-of-Bethlehem | Ornithogalum umbellatum | agave and allies | 94 | Apr (past peak) |
| 7 | Fire Pink | Silene virginica | pink family | 87 | Apr (past peak) |
| 8 | Common Pawpaw | Asimina triloba | custard-apples | 84 | Apr (past peak) |
| 9 | Purple Milkweed | Asclepias purpurascens | Dogbane Family | 76 | Jun (rising) |
| 10 | Green Antelopehorns | Asclepias viridis | Dogbane Family | 66 | May (peak) |
| 11 | Purple Rocket | Iodanthus pinnatifidus | mustard family | 66 | May (peak) |
| 12 | Common Hoptree | Ptelea trifoliata | citrus family | 64 | May (peak) |
| 13 | Amur honeysuckle | Lonicera maackii | honeysuckle family | 64 | May (peak) |
| 14 | Four-Leaved Milkweed | Asclepias quadrifolia | Dogbane Family | 56 | May (peak) |
| 15 | Atlantic camas | Camassia scilloides | agave and allies | 52 | Apr (past peak) |
| 16 | White Clover | Trifolium repens | Legumes | 51 | May (peak) |
| 17 | Hoary Puccoon | Lithospermum canescens | borage family | 41 | Apr (past peak) |
| 18 | Red Clover | Trifolium pratense | Legumes | 39 | May (peak) |
| 19 | Border Privet | Ligustrum obtusifolium | olive family | 39 | May (peak) |
| 20 | Field Bindweed | Convolvulus arvensis | bindweed family | 37 | Jun (rising) |
| 21 | Hop Trefoil | Trifolium campestre | Legumes | 36 | May (peak) |
| 22 | Eastern Shooting Star | Primula meadia | primrose family | 36 | Apr (past peak) |
| 23 | American tuliptree | Liriodendron tulipifera | magnolia family | 35 | May (peak) |
| 24 | Prairie Trillium | Trillium recurvatum | Herb-Paris, False Hellebores, Trilliums and allies | 35 | Apr (past peak) |
| 25 | Ribwort Plantain | Plantago lanceolata | Plantain Family | 34 | Jun (rising) |
| 26 | American persimmon | Diospyros virginiana | persimmon family | 34 | Jun (rising) |
| 27 | Oxeye Daisy | Leucanthemum vulgare | Sunflowers, Daisies, Asters, and Allies | 33 | May (peak) |
| 28 | Japanese honeysuckle | Lonicera japonica | honeysuckle family | 33 | May (peak) |
| 29 | Butterfly Milkweed | Asclepias tuberosa | Dogbane Family | 32 | Jun (rising) |
| 30 | Great Waterleaf | Hydrophyllum appendiculatum | borage family | 32 | May (peak) |
| 31 | Ohio spiderwort | Tradescantia ohiensis | Spiderworts | 31 | May (peak) |
| 32 | Yellow Lady's Slipper | Cypripedium parviflorum | Orchids | 30 | May (peak) |
| 33 | clasping Venus's looking glass | Triodanis perfoliata | bellflower family | 27 | May (peak) |
| 34 | American bladdernut | Staphylea trifolia | bladdernut family | 27 | Apr (past peak) |
| 35 | Mayapple | Podophyllum peltatum | barberry family | 26 | Apr (past peak) |
| 36 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 26 | May (peak) |
| 37 | Ground-Ivy | Glechoma hederacea | Mint Family | 26 | Apr (past peak) |
| 38 | Carolina crane's-bill | Geranium carolinianum | Geranium family | 26 | May (peak) |
| 39 | Yellow Star Grass | Hypoxis hirsuta | Stargrasses and allies | 26 | Apr (past peak) |
| 40 | Wild Geranium | Geranium maculatum | Geranium family | 24 | Apr (past peak) |
| 41 | Canadian lousewort | Pedicularis canadensis | broomrape family | 24 | Apr (past peak) |
| 42 | Foxglove Beardtongue | Penstemon digitalis | Plantain Family | 24 | May (peak) |
| 43 | Prairie Phlox | Phlox pilosa | phlox family | 24 | May (peak) |
| 44 | Dame's Rocket | Hesperis matronalis | mustard family | 23 | May (peak) |
| 45 | Common Selfheal | Prunella vulgaris | Mint Family | 23 | May (peak) |
| 46 | Dwarf Larkspur | Delphinium tricorne | buttercup family | 23 | Apr (past peak) |
| 47 | Catchweed Bedstraw | Galium aparine | madder family | 22 | May (peak) |
| 48 | Flowering Dogwood | Cornus florida | Dogwood family | 22 | Apr (past peak) |
| 49 | Butterweed | Packera glabella | Sunflowers, Daisies, Asters, and Allies | 22 | May (peak) |
| 50 | Blue Phlox | Phlox divaricata | phlox family | 22 | Apr (past peak) |