This name is a synonym of Tephrosia purpurea subsp. leptostachya (DC.) Brummitt.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13069002) with original publication details: Notul. Syst. (Paris) 14(1): 63 1950.
This name was in version 1 of The Plant List, record tro-13069002, and has not been changed.