60 wildflowers were recorded blooming in Delaware in May in our iNaturalist sample; 36 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in May
Pink Lady's Slipper
common star-of-Bethlehem
Canada toadflax
Partridgeberry
Multiflora Rose
Philadelphia fleabane
Lyreleaf Sage
Showy Orchis
White Clover
Mayapple
One-Flowered Cancer-Root
Poison Hemlock
All wildflowers blooming in Delaware in May
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Pink Lady's Slipper | Cypripedium acaule | Orchids | 72 | May (peak) |
| 2 | common star-of-Bethlehem | Ornithogalum umbellatum | agave and allies | 65 | May (peak) |
| 3 | Canada toadflax | Linaria canadensis | Plantain Family | 53 | May (peak) |
| 4 | Partridgeberry | Mitchella repens | madder family | 49 | May (peak) |
| 5 | Multiflora Rose | Rosa multiflora | rose family | 47 | May (peak) |
| 6 | Philadelphia fleabane | Erigeron philadelphicus | Sunflowers, Daisies, Asters, and Allies | 38 | May (peak) |
| 7 | Lyreleaf Sage | Salvia lyrata | Mint Family | 37 | May (peak) |
| 8 | Showy Orchis | Galearis spectabilis | Orchids | 32 | May (peak) |
| 9 | White Clover | Trifolium repens | Legumes | 28 | May (peak) |
| 10 | Mayapple | Podophyllum peltatum | barberry family | 26 | May (peak) |
| 11 | One-Flowered Cancer-Root | Aphyllon uniflorum | broomrape family | 25 | May (peak) |
| 12 | Poison Hemlock | Conium maculatum | carrot family | 24 | May (peak) |
| 13 | Red Clover | Trifolium pratense | Legumes | 23 | May (peak) |
| 14 | Ground-Ivy | Glechoma hederacea | Mint Family | 23 | Apr (past peak) |
| 15 | American tuliptree | Liriodendron tulipifera | magnolia family | 21 | May (peak) |
| 16 | Japanese honeysuckle | Lonicera japonica | honeysuckle family | 19 | May (peak) |
| 17 | Bristle Thistle | Cirsium horridulum | Sunflowers, Daisies, Asters, and Allies | 19 | May (peak) |
| 18 | Dove's-foot crane's-bill | Geranium molle | Geranium family | 18 | Apr (past peak) |
| 19 | Virginia waterleaf | Hydrophyllum virginianum | borage family | 18 | May (peak) |
| 20 | Virginia Springbeauty | Claytonia virginica | Pussypaw Family | 18 | Apr (past peak) |
| 21 | Catchweed Bedstraw | Galium aparine | madder family | 17 | May (peak) |
| 22 | Black Locust | Robinia pseudoacacia | Legumes | 17 | May (peak) |
| 23 | Autumn Olive | Elaeagnus umbellata | oleaster family | 17 | Apr (past peak) |
| 24 | Lesser hop trefoil | Trifolium dubium | Legumes | 16 | May (peak) |
| 25 | Mock Strawberry | Potentilla indica | rose family | 16 | Apr (past peak) |
| 26 | Dame's Rocket | Hesperis matronalis | mustard family | 15 | May (peak) |
| 27 | Yellow Iris | Iris pseudacorus | iris family | 15 | May (peak) |
| 28 | Purple Crownvetch | Securigera varia | Legumes | 15 | Jun (rising) |
| 29 | Field madder | Sherardia arvensis | madder family | 14 | May (peak) |
| 30 | Wild Geranium | Geranium maculatum | Geranium family | 14 | May (peak) |
| 31 | Common Pawpaw | Asimina triloba | custard-apples | 13 | Apr (past peak) |
| 32 | clasping Venus's looking glass | Triodanis perfoliata | bellflower family | 13 | Jun (rising) |
| 33 | Beach Plum | Prunus maritima | rose family | 13 | Apr (past peak) |
| 34 | Narrow-Leaved Bittercress | Cardamine impatiens | mustard family | 13 | May (peak) |
| 35 | Northern Blue Flag | Iris versicolor | iris family | 12 | May (peak) |
| 36 | Mountain Laurel | Kalmia latifolia | heath family | 12 | May (peak) |
| 37 | Jack-in-the-Pulpit | Arisaema triphyllum | Arum Family | 12 | Apr (past peak) |
| 38 | Mapleleaf Viburnum | Viburnum acerifolium | elder family | 12 | May (peak) |
| 39 | Black Cherry | Prunus serotina | rose family | 10 | May (peak) |
| 40 | Cucumber Root | Medeola virginiana | lily family | 10 | May (peak) |
| 41 | European field pansy | Viola arvensis | Violet Family | 10 | Apr (past peak) |
| 42 | Hop Trefoil | Trifolium campestre | Legumes | 10 | May (peak) |
| 43 | Rue Anemone | Thalictrum thalictroides | buttercup family | 10 | Apr (past peak) |
| 44 | Princess Tree | Paulownia tomentosa | foxglove tree family | 10 | May (peak) |
| 45 | Red Deadnettle | Lamium purpureum | Mint Family | 9 | Apr (past peak) |
| 46 | Strawberry Bush | Euonymus americanus | staff-vine family | 9 | May (peak) |
| 47 | Aniseroot | Osmorhiza longistylis | carrot family | 9 | May (peak) |
| 48 | Border Privet | Ligustrum obtusifolium | olive family | 9 | May (peak) |
| 49 | Solomon's plume | Maianthemum racemosum | agave and allies | 8 | May (peak) |
| 50 | Flowering Dogwood | Cornus florida | Dogwood family | 8 | Apr (past peak) |