Wildflowers Blooming in Pennsylvania in May (60 Species)

60 wildflowers were recorded blooming in Pennsylvania in May in our iNaturalist sample; 33 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.

Feb Mar Apr May Jun Jul Aug Sep Oct Nov

Top wildflowers in May

Dame's Rocket845 obs.

Large White Trillium673 obs.

common star-of-Bethlehem596 obs.

Pink Lady's Slipper556 obs.

Azure Bluet447 obs.

Wild Geranium435 obs.

Painted Trillium373 obs.

Northern Starflower342 obs.

Red Trillium340 obs.

Red Columbine332 obs.

Philadelphia fleabane325 obs.

Multiflora Rose324 obs.

All wildflowers blooming in Pennsylvania in May

#	Species	Scientific name	Family	Obs.	Peak in state
1	Dame's Rocket	Hesperis matronalis	mustard family	845	May (peak)
2	Large White Trillium	Trillium grandiflorum	Herb-Paris, False Hellebores, Trilliums and allies	673	Apr (past peak)
3	common star-of-Bethlehem	Ornithogalum umbellatum	agave and allies	596	May (peak)
4	Pink Lady's Slipper	Cypripedium acaule	Orchids	556	May (peak)
5	Azure Bluet	Houstonia caerulea	madder family	447	Apr (past peak)
6	Wild Geranium	Geranium maculatum	Geranium family	435	May (peak)
7	Painted Trillium	Trillium undulatum	Herb-Paris, False Hellebores, Trilliums and allies	373	May (peak)
8	Northern Starflower	Lysimachia borealis	primrose family	342	May (peak)
9	Red Trillium	Trillium erectum	Herb-Paris, False Hellebores, Trilliums and allies	340	Apr (past peak)
10	Red Columbine	Aquilegia canadensis	buttercup family	332	May (peak)
11	Philadelphia fleabane	Erigeron philadelphicus	Sunflowers, Daisies, Asters, and Allies	325	May (peak)
12	Multiflora Rose	Rosa multiflora	rose family	324	May (peak)
13	Narrow-Leaved Bittercress	Cardamine impatiens	mustard family	300	May (peak)
14	Creeping Foamflower	Tiarella stolonifera	saxifrage family	297	May (peak)
15	Mayapple	Podophyllum peltatum	barberry family	270	May (peak)
16	Ground-Ivy	Glechoma hederacea	Mint Family	253	Apr (past peak)
17	Garlic Mustard	Alliaria petiolata	mustard family	251	Apr (past peak)
18	Virginia Springbeauty	Claytonia virginica	Pussypaw Family	233	Apr (past peak)
19	Greater celandine	Chelidonium majus	Poppy Family	228	May (peak)
20	Dwarf Ginseng	Panax trifolius	ivy family	217	Apr (past peak)
21	Jack-in-the-Pulpit	Arisaema triphyllum	Arum Family	212	May (peak)
22	Amur honeysuckle	Lonicera maackii	honeysuckle family	209	May (peak)
23	Fringed Polygala	Polygaloides paucifolia	milkworts	199	May (peak)
24	Catchweed Bedstraw	Galium aparine	madder family	197	May (peak)
25	American bladdernut	Staphylea trifolia	bladdernut family	196	May (peak)
26	Common Pawpaw	Asimina triloba	custard-apples	190	Apr (past peak)
27	Autumn Olive	Elaeagnus umbellata	oleaster family	183	May (peak)
28	American tuliptree	Liriodendron tulipifera	magnolia family	179	May (peak)
29	Canada mayflower	Maianthemum canadense	agave and allies	168	May (peak)
30	Flowering Dogwood	Cornus florida	Dogwood family	156	Apr (past peak)
31	Princess Tree	Paulownia tomentosa	foxglove tree family	151	May (peak)
32	Carpet Bugle	Ajuga reptans	Mint Family	149	May (peak)
33	Rue Anemone	Thalictrum thalictroides	buttercup family	141	Apr (past peak)
34	Blackhaw	Viburnum prunifolium	elder family	132	May (peak)
35	Blue Phlox	Phlox divaricata	phlox family	127	Apr (past peak)
36	Moss Phlox	Phlox subulata	phlox family	126	Apr (past peak)
37	Red Clover	Trifolium pratense	Legumes	124	Jun (rising)
38	White Clover	Trifolium repens	Legumes	124	May (peak)
39	Winged Euonymus	Euonymus alatus	staff-vine family	123	May (peak)
40	Woodland Stonecrop	Sedum ternatum	stonecrop family	121	May (peak)
41	Red Deadnettle	Lamium purpureum	Mint Family	120	Apr (past peak)
42	Deerberry	Vaccinium stamineum	heath family	120	May (peak)
43	Solomon's plume	Maianthemum racemosum	agave and allies	117	May (peak)
44	Virginia waterleaf	Hydrophyllum virginianum	borage family	114	May (peak)
45	Wild Sarsaparilla	Aralia nudicaulis	ivy family	110	May (peak)
46	Fire Pink	Silene virginica	pink family	105	May (peak)
47	Virginia bluebells	Mertensia virginica	borage family	104	Apr (past peak)
48	Golden Ragwort	Packera aurea	Sunflowers, Daisies, Asters, and Allies	102	Apr (past peak)
49	Yellow Iris	Iris pseudacorus	iris family	100	May (peak)
50	Mountain Laurel	Kalmia latifolia	heath family	98	Jun (rising)