Conservation assessment for the autumn willow in the Black Hills National Forest, South Dakota and Wyoming

摘要: Autumn willow, Salix serissima (Bailey) Fern., is an obligate wetland shrub that occurs in fens and bogs the northeastern United States eastern Canada. Disjunct populations of autumn willow occur Black Hills South Dakota. Only two on National Forest lands: a large population at McIntosh Fen small Middle Boxelder Creek. Both association with specific geologic hydrologic conditions have resulted elevated water table, fen-like habitats saturated organic substrates. These are extremely rare Hills. Monitoring data indicate stable to increasing, perhaps response recent restoration efforts several years high precipitation. results encouraging, but whether habitat possible newly discovered site Creek remains be seen. The persistence dependent conserving these public land, which makes species highly vulnerable catastrophes such as severe declines spread diseases or invasions by noxious weeds other invasive species.