Goyder (Schltr.) 1998 - Goyder DJ (1998) A Revision of the African Genus Stathmostelma K. Schum. (Apocynaceae: Asclepiadeae). Kew Bulletin 53(3): 577-616. doi: 10.2307/4110479.
There is no corrections for Stathmostelma spectabile subsp. frommii yet.