Erigeron philadelphicus, the Philadelphia fleabane, is a species of flowering plant in the composite family (Asteraceae).

Its active growth period is from spring to summer (April to July),[6][7] with flowers until September.

Prairie fleabane is an annual, rather than a perennial, from 30–90 centimetres (1–3 feet) tall, and it lacks clasping leaves surrounding the stem.

Low Erigeron is shorter, only 5–30 centimetres (0–1 foot) tall, and it can have white, pink, or bluish rays.

[3] Philadelphia fleabane is native to North America and found in nearly all of the United States and Canada.

[5] Provancher's fleabane is restricted to calcareous rocky shorelines in the Great Lakes-St. Lawrence lowlands.

[13] Because of their distinct phytogeography and habitat affinities, the three accepted varieties of Philadelphia fleabane have been assessed independently by conservation scientists.