L.E.Skog (Urb.) 1976 - Skog LE (1976) A study of the tribe Gesneriaceae, with a revision of Gesneria (Gesneriaceae-Gesnerioideae). Smithsonian Contributions to Botany (29): 1-182. doi: 10.5479/si.0081024x.29.
There is no corrections for Gesneria scabra var. sphaerocarpa yet.