NPSpecies

Data Source: Bartgis, 1993;Boone, 1986;TNC, 1999; Wiegand, 1999; Wiegand, 2001;Wiegand, 2001b;

Data Source: Helen Hamilton

Data Source: Helen Hamilton

Park Species Detail: Wiegand, 2001: Two of the three previously reported sites for Upright burhead (Echinodorus cordifolius) were successfully updated during 1999 field surveys (from Sandy Hook, Maryland to District of Columbia line). Both updated occurrences are small and occur in wet depressions that are dependent upon flooding as a source of moisture. During 1999 a total of nearly 140 clumps were counted in the two groups. During 2000 a total of 64 clumps were counted in one group. The other group was covered by flood debris following winter/spring flooding and did not appear during the growing season. A third, and smaller, occurrence for upright burhead on Rocky Islands was buried beneath several meters of alluvial sand as a result of the 1996 floods and has not been reported since that time. This species is known from one additional site in Maryland outside of the Potomac Gorge. These Maryland sites for upright burhead represent the northern extremity of the species' east coast distribution. Heavy deer browse and trampling by hikers are serious threats to this species in the gorge. Bartgis, 1993: Found in Potomac Fall-Line. Wiegand, 2001b: Heart-leaved burhead (Echinodorus cordifolius) is listed as extirpated from D.C. It was last reported from Chain Bridge Flats by W.L. McAtee when he reported it Along a depression in the flats below Chain Bridge in 1900. It has not been reported or collected from this area since that time, 101 years ago. Scoured depressions in this area were thoroughly searched during 1999-2000 field surveys without success. However, suitable habitat remains intact in the area so there is a remote possibility that the species still occurs here.Status surveys for heart-leaved burhead are highly recommended to fully determine its current status at Chain Bridge Flats. In Maryland, this species is listed as upright burhead” but it is the same plant. Found at 0 sites. A Presumed Extirpated (SX) 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, 1999: Plant species documented in the survey area (from Great Falls, Maryland, downriver to the District of Columbia) during this survey. Currently listed in Maryland as endangered or endangered/extirpated. Two (2) of the three (3) previously reported sites for Upright burhead (Echinodorus cordifolius) were successfully updated. Despite the prolonged drought experienced in the gorge during the summer and fall of 1998 the Upright burhead seemed to do well. Both updated occurrences are small and occur in wet depressions that are dependent upon flooding as a source of moisture. Both sites were unusually dry during the growing season of 1998. A third, and smaller, occurrence for Upright burhead on Rocky Islands was buried beneath several meters of alluvial sand as a result of the 1996 floods and was not seen during surveys in either 1997 or 1998. This state-endangered species is not known to occur anywhere in Maryland outside of the Potomac Gorge., Park Species Data Source: Bartgis, 1993;Boone, 1986;TNC, 1999;Wiegand, 1999;Wiegand, 2001; Wiegand, 2001b;