NPSpecies

Data Source: Gleason & Cronquist, 1991

Natural Heritage Resource G5 S2; Data Source: Hobson, 1998

Park Species Detail: Hobson, 1998: The invasive alien grass, eulalia, may be the most serious threat to the integrity of the significant communities and the long-term viability of the bog twayblade populations. It might be possible to hold the eulalia populations to reduced levels in the specific bog twayblade sites, but reducing it in the seepage swamps is not feasible. Clark and Rafkind (1997) provide a more detailed monitoring schedule and protocol for natural heritage resources addressed in their Conservation Plan for the larger but inclusive "Cheatham Ravines Natural Area."/Townsend, 2005: Global rank G5; State rank, S2 = Imperiled -- At high risk of extirpation from the state due to very restricted range, very few populations (often 20 or fewer), steep declines, or other factors./Ludwig, 1993: Monitor Loesel's twayblade and other native plant species to determine degree of threat from the Eulalia viminea population. If competition with the exotic is a threat, implement control measures to protect the population. If current land use or management practices change within the site boundary, consult with DNH staff to avoid negative impact to the natural heritage resources., Park Species Data Source: Ludwig et al, 1993a-Colonial Parkway/Jamestown Unit/Yorktown Unit;Hobson, 1998-Yorktown Unit/ Cheatham and Wormley Pond Drainages;Clark, 1998-Colonial Parkway/Jamestown Unit/Yorktown Unit;