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: Three new and nine previously reported occurrences for Climbing dogbane (Trachelospermtrm difforme) were documented - all of these in the Potomac Gorge section of the survey area (from Sandy Hook, Maryland to District of Columbia line). Total number of plants seen during the current survey is approximately 800-1,000. Half of these grow on Sherwin Island. Climbing dogbane generally is a southern species nearing the northern extremity of its known range in Maryland. Most of the known occurrences for this species in Maryland occur in the Potomac Gorge. Bartgis, 1993: State Endangered plant, found in Potomac Fall-Line. Wiegand, 2001b: A previously reported occurrence for Climbing dogbane (Trachelospermum difforme), listed as a highly rare plant species in D.C., was successfully updated during 1999-2000 field surveys. Scattered small groups and individuals were seen The plants were healthy and showed signs of reproduction including buds, flowers and fruit. This area is low to the river and floods frequently during seasonal high water in winter and spring, and after up river storm events. Inundation often lasts for extended periods, perhaps as long as several weeks during the winter and spring. Suitable habitat for climbing dogbane is abundant in the vicinity, so this occurrence could be more extensive than reported here.Statussurveys for this species are highly recommended to filly determine its current status at Chain Bridge Flats.Found in Fletchers Floodplain Survey Site. Found at 3 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.) 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. Five (5) new sites for the state-endangered Climbing dogbane (Trachelospermum difforme) were documented. This twining vine with a semi-woody base is generally a more southern species and here nears the northern extremity of its known range. Climbing dogbane was also successfully updated at three previously reported sites in the gorge. Nearly all the known occurrences for this species in Maryland occur in the Potomac Gorge., Park Species Data Source: Bartgis, 1993;Boone, 1986;TNC, 1999;Wiegand, 1999;Wiegand, 2001;Wiegand, 2001b;