NPSpecies

Data Source: Killip, 1953; Leeson, n.d.;Maxon, 1935;Terrell, 1970;Wiegand, 1999; Wiegand, 2001; Wiegand, 1995;

Data Source: Helen Hamilton

see comments; Data Source: Helen Hamilton

Park Species Detail: Maxon, 1935: Known only from the mainland. Killip, 1953: June 2 (Chain Bridge to Lock 10 parking area opposite Plummer's Island)5, 1948; known previously only from the mainland. Terrell, 1970: Rare; woods on Bear Island (are Fl. May. Wiegand, 2001: Documented from Maryland during this survey from Sandy Hook, Maryland, to District of Columbia line. Wiegand, 1999: A Watch List species in Maryland, documented to occur in the gorge during this survey from Great Falls, Maryland, downriver to the District of Columbia line. Wiegand, 1995: Reported during this survey from Sandy Hook west to Cumberland., Park Species Data Source: Killip, 1953;Leeson, n.d.;Maxon, 1935;Terrell, 1970;Wiegand, 1999;Wiegand, 2001;Wiegand, 1995;