NPSpecies

See comments; Relocation population gone 2 days later.; Data Source: Bartgis, 1993;Maxon, 1935;TNC, 1999; Wiegand, 1999; Wiegand, 2001;

Data Source: Helen Hamilton

Data Source: Helen Hamilton

Park Species Detail: Maxon, 1935: Rare. Bartgis, 1993: State Endangered extirpated plant, in Potomac Fall-Line. Wiegand, 2001: Among the most exciting results of this survey (from Sandy Hook, Maryland to District of Columbia line) was the successful updating of a previously reported occurrence for Nodding pogonia (Triphora trianthophora). This rare orchid species was last reported from Maryland nearly 50 years ago. Two groups of plants in full bud, separated by no more than 20 meters -from one another, were found near the old trolley turn-around in the Goldmine Tract just above Great Falls Tavern. This site is a well-known historical location for the nodding pogonia and has been surveyed many times during the past 20 years without success. When relocated in 1998, the nodding pogonia population was carefully counted and the adjacent woodland habitat was thoroughly searched. A total of 27 plants were found. Unfortunately, a search for the plants during a return trip to the site two days later proved hitless. It is probable that the nodding pogonia orchids were browsed by the large local deer population. Attempts to update nodding pogonia at four additional previously known sites were unsuccessful. 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. Among the most exciting results of this survey was the successful updating of a previously reported occurrence for Nodding pogonia (Triphora trianthophora). This rare orchid species was last reported from Maryland nearly fifty years ago and is officially listed as extirpated from the state. Two groups of plants in full bud, separated by no more than twenty meters from one another, were observed near the old trolley turn around in the Goldmine Tract just above Great Falls Tavern. This site is a well-known historical location forthe Nodding pogonia and has been surveyed many times during the past twenty years without success. When relocated this year, the Nodding pogonia population was carefully counted and the adjacent woodland habitat was thoroughly searched. A total of 27 plants were found. Unfortunately, a search for the plants during a return trip to the site two days later proved fruitless - not a single stem or stub could be found. It is probable that the Nodding pogonia orchids were browsed by the large local deer population. Further surveys for the rare orchid in this area were conducted during September and October without success., Park Species Data Source: Bartgis, 1993;Maxon, 1935;TNC, 1999;Wiegand, 1999;Wiegand, 2001;