NPSpecies

Data Source: Gleason & Cronquist, 1991

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

Park Species Detail: Hobson, 1998: Element occurrence rank = B; the exotic basket grass Arthraxon hispidus may threaten populations of sandpaper vervain. Threats to the quality of the site for rare plants arise from invasive alien plant species, particularly eulalia (Microstegium vimineum) which is especially abundant in the ravine bottoms. Protection recommendations: Avoid direct disturbance to seepage habitats and upslope disturbances such as timber harvest, which may alter the hydrologic regime or add sediment to streams or ravines supporting the significant communities, rare lants and amphipod populations. /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./, Park Species Data Source: Hobson, 1998-Yorktown Unit/ Cheatham and Wormley Pond Drainages;VanAlstine, 2004-Entire Park