NPSpecies

Data Source: Cranberry Meadows, 1997;Bilton, 1991 Leeson, n.d.;Maxon, 1935;TNC, 1999; Terrell, 1970;Wiegand, 2001;

Data Source: Helen Hamilton

see comments; Data Source: Helen Hamilton

Park Species Detail: Terrell, 1970: Frequent in rich woods in areas 2 (2 (Chain Bridge to Lock 10 parking area opposite Plummer's Island)), 3 (3 (Lock 10 to Carderock, north parking lot), ) 5 (Bear Island), 7 (Great Falls to Swain’s Lock), 8 [Swain’s Lock to Pennyfield Lock (north end)]. Most abundant on south part of Bear Island. Fl. Mid April to early May; flowers usually purplish but yellowish ones (forma viridiflorum Beyer) seen in area 2 (Chain Bridge to Lock 10 parking area opposite Plummer's Island). Cranberry Meadows, 1997: Rare, Chain Bridge Flats above Arizona Bridge. Bilton, 1991: peak flowering. Wiegand, 2001b: A previously reported occurrence for Sessile trillium (Trillium sessile), listed as a highly rare plant species in D.C., was not successfully updated during 1999-2000 field surveys. It was last reported from Chain Bridge Flats by C.Lea (Pers.Comm. 1999) when he reported it In 1997. No specific survey effort to relocate this species at Chain Bridge Flats was made during 1999-2000. However, suitable habitat remains intact in the area so the species likely still occurs here.Status surveys for sessile trillium are highly recommended to fully determine its current status at Chain Bridge Flats Survey Site. Found at 0 sites. A Highly Rare plant species known to occur within the District of Columbia portion of LOCO (along the C&O Canal NHP and Potomac River from the Maryland line to Key Bridge, Washington, D.C.), Park Species Data Source: Cranberry Meadows, 1997;Bilton, 1991-Ferry Hill;Leeson, n.d.;Maxon, 1935;TNC, 1999;Terrell, 1970;Wiegand, 2001;