Astilbe crenatiloba (Britton) Small. Phen: Jul?; Sep. Hab: Mountain forests. Dist: Known only from Roan Mountain, Carter County, TN and very rare or extinct.
Origin/Endemic status: Endemic
Other Comments: This species has apparently not been seen since the original collections (11 September 1885) by N.L. Britton and Mrs. Britton ("Tennessee. Base of Roan Mountain. Collected on the slope of Roan Mountain, East Tennessee, along the trail from ‘Cloudland’ to the Roan Mountain station of the E.T. & W.N.C.R.R."); the habitat, phenology, and other characteristics of this species are therefore poorly known. The morphologic characters seem fairly striking.
Synonymy: = K1, K3, K4, S, Tn, W; < Astilbe biternata (Vent.) Britton – FNA8, RAB