NPSpecies

Data Source: BioBlitz, 1997-Chain Bridge Flats;Maxon, 1935;TNC, 1999; Terrell, 1970;Wiegand, 2001b;

Data Source: Helen Hamilton

Data Source: Helen Hamilton

Park Species Detail: Terrell, 1970: (H. spathulatum of GM) Scarce; rocky places in areas 1 (Beginning of Canal in Georgetown to Chain Bridge, D. C.), 5 (Bear Island), 6 (Great Falls; islands overlooking Falls). Wiegand, 2001b: A previously reported occurrence for Shrubby St.John’s-wort (Hypericun prolificum), listed as a rare plant species in D.C., was successfully updated during 1999-2000 field surveys. It is widespread and scattered in clumpsMost of the habitat occupied by the shrubby St.John's-wort floods on a regular but infrequent basis, probably every several years. Suitable habitat for shrubby St.John's-wort is abundant in the vicinity, so this occurrence could be more extensive than reported here.Status surveys for this species are highly recommended to fully determine its current status at Chain Bridge Flats Survey Site. Found at 2 sites. A 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.)Hamilton, 2007: See Hypericum spathulatum, a synonym., Park Species Data Source: BioBlitz, 1997-Chain Bridge Flats;Maxon, 1935;TNC, 1999;Terrell, 1970;Wiegand, 2001b;