NPSpecies

Data Source: Wiegand, 1999; Wiegand, 2001; Wiegand, 2001b; Wiegand, 1995;

Data Source: Helen Hamilton

Data Source: Helen Hamilton

Park Species Detail: Wiegand, 2001b: occurs in elevated areas of scour prairie and overwash savanna habitat where soils are well-drained and often dry during the growing season. Whorled milkweed (Asclepias verticillata) occurs sporadically in this area, growing in a dry sandy substrate throughout the prairie and savanna habitats. It is difficult to see, owing to its weak stem and recumbent habit. 1 site found. A watch list (and otherwise uncommon) 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.) Also a listed species in Maryland. 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: Wiegand, 1999;Wiegand, 2001;Wiegand, 2001b;Wiegand, 1995