NPSpecies

Data Source: Bilton, 1991 Maxon, 1935;Terrell, 1970

Data Source: Helen Hamilton

Data Source: Helen Hamilton

Park Species Detail: Terrell, 1970: Frequent; woods in areas 1(Beginning of Canal in Georgetown to Chain Bridge, D. C.), 4 [Carderock to Cropley (parking area near Angler’s Inn)], , ), 8 [Swain’s Lock to Pennyfield Lock (north end)], but only one or a few plants per location. Fll. April to Mid M . . .. Bilton, 1991: peak flowering., Park Species Data Source: Bilton, 1991-Ferry Hill;Maxon, 1935;Terrell, 1970;