Solidago albopilosa Braun is a very rare species found in sandstone "rockhouse" formations in northern Kentucky. It is similar to S. flexicaulis, but has densely hairy stems (Semple & Cook 2006 FNA). Solidago albopilosa is listed as threatened by the U.S. Fish and Wildlife Service (Federal Register 1988). The species is tetraploid 2n=36.