60 wildflowers were recorded blooming in Maryland in April in our iNaturalist sample; 42 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in April

Common Pawpaw
Virginia Springbeauty

Virginia bluebells

Yellow Trout Lily

Lesser Celandine
Garlic Mustard

Dutchman's breeches

Azure Bluet

Bloodroot

Red Deadnettle

Ground-Ivy

Moss Phlox
All wildflowers blooming in Maryland in April
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Common Pawpaw | Asimina triloba | custard-apples | 1,032 | Apr (peak) |
| 2 | Virginia Springbeauty | Claytonia virginica | Pussypaw Family | 781 | Apr (peak) |
| 3 | Virginia bluebells | Mertensia virginica | borage family | 770 | Apr (peak) |
| 4 | Yellow Trout Lily | Erythronium americanum | lily family | 630 | Apr (peak) |
| 5 | Lesser Celandine | Ficaria verna | buttercup family | 566 | Mar (past peak) |
| 6 | Garlic Mustard | Alliaria petiolata | mustard family | 560 | Apr (peak) |
| 7 | Dutchman's breeches | Dicentra cucullaria | Poppy Family | 519 | Apr (peak) |
| 8 | Azure Bluet | Houstonia caerulea | madder family | 481 | Apr (peak) |
| 9 | Bloodroot | Sanguinaria canadensis | Poppy Family | 424 | Mar (past peak) |
| 10 | Red Deadnettle | Lamium purpureum | Mint Family | 422 | Apr (peak) |
| 11 | Ground-Ivy | Glechoma hederacea | Mint Family | 309 | Apr (peak) |
| 12 | Moss Phlox | Phlox subulata | phlox family | 257 | Apr (peak) |
| 13 | Rue Anemone | Thalictrum thalictroides | buttercup family | 246 | Apr (peak) |
| 14 | Mayapple | Podophyllum peltatum | barberry family | 219 | Apr (peak) |
| 15 | Flowering Dogwood | Cornus florida | Dogwood family | 212 | Apr (peak) |
| 16 | Dwarf Ginseng | Panax trifolius | ivy family | 206 | Apr (peak) |
| 17 | Jack-in-the-Pulpit | Arisaema triphyllum | Arum Family | 204 | Apr (peak) |
| 18 | Trailing Arbutus | Epigaea repens | heath family | 201 | Apr (peak) |
| 19 | Incised Fumewort | Corydalis incisa | Poppy Family | 193 | Apr (peak) |
| 20 | common star-of-Bethlehem | Ornithogalum umbellatum | agave and allies | 183 | May (rising) |
| 21 | Squirrel Corn | Dicentra canadensis | Poppy Family | 176 | Apr (peak) |
| 22 | Amur honeysuckle | Lonicera maackii | honeysuckle family | 176 | Apr (peak) |
| 23 | American field pansy | Viola rafinesquei | Violet Family | 167 | Apr (peak) |
| 24 | Star Chickweed | Stellaria pubera | pink family | 163 | Apr (peak) |
| 25 | Pink Lady's Slipper | Cypripedium acaule | Orchids | 160 | May (rising) |
| 26 | Red Columbine | Aquilegia canadensis | buttercup family | 160 | Apr (peak) |
| 27 | Mock Strawberry | Potentilla indica | rose family | 153 | Apr (peak) |
| 28 | Annual Honesty | Lunaria annua | mustard family | 149 | Apr (peak) |
| 29 | Toadshade | Trillium sessile | Herb-Paris, False Hellebores, Trilliums and allies | 144 | Apr (peak) |
| 30 | Showy Orchis | Galearis spectabilis | Orchids | 138 | Apr (peak) |
| 31 | Virginia saxifrage | Micranthes virginiensis | saxifrage family | 137 | Apr (peak) |
| 32 | Jetbead | Rhodotypos scandens | rose family | 136 | Apr (peak) |
| 33 | Cut-Leaved Toothwort | Cardamine concatenata | mustard family | 133 | Apr (peak) |
| 34 | American bladdernut | Staphylea trifolia | bladdernut family | 127 | Apr (peak) |
| 35 | Autumn Olive | Elaeagnus umbellata | oleaster family | 126 | Apr (peak) |
| 36 | Eastern Redbud | Cercis canadensis | Legumes | 125 | Apr (peak) |
| 37 | Reflexed Wild Ginger | Asarum reflexum | birthwort family | 120 | Apr (peak) |
| 38 | Blackhaw | Viburnum prunifolium | elder family | 119 | Apr (peak) |
| 39 | Bird's-Eye Speedwell | Veronica persica | Plantain Family | 110 | Mar (past peak) |
| 40 | Henbit Deadnettle | Lamium amplexicaule | Mint Family | 108 | Mar (past peak) |
| 41 | Catchweed Bedstraw | Galium aparine | madder family | 97 | May (rising) |
| 42 | Small-Flowered Buttercup | Ranunculus abortivus | buttercup family | 93 | Apr (peak) |
| 43 | Dove's-foot crane's-bill | Geranium molle | Geranium family | 91 | Apr (peak) |
| 44 | Yellow Corydalis | Corydalis flavula | Poppy Family | 89 | Apr (peak) |
| 45 | Lesser Periwinkle | Vinca minor | Dogbane Family | 88 | Apr (peak) |
| 46 | European field pansy | Viola arvensis | Violet Family | 86 | Apr (peak) |
| 47 | Celandine Poppy | Chelidonium diphyllum | Poppy Family | 83 | Apr (peak) |
| 48 | Bird's Foot Violet | Viola pedata | Violet Family | 78 | Apr (peak) |
| 49 | Philadelphia fleabane | Erigeron philadelphicus | Sunflowers, Daisies, Asters, and Allies | 76 | May (rising) |
| 50 | Common Vetch | Vicia sativa | Legumes | 74 | Apr (peak) |