Allegheny Stonecrop, a native species, has been added to the USWildflowers database (9/14/2014.)  Scientific name is Hylotelephium telephioides. Photo below was taken along the Skyline Drive, Shenandoah National Park, in Rockingham County, VA on Sep 4, 2014. Go to the Allegheny Stonecrop detail page for more photos and information.

Allegheny Stonecrop – Hylotelephium telephioides