This name is a synonym of Rhamnus crocea subsp. pilosa (Trel. ex Curran) C.B. Wolf.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50084629) with original publication details: Proc. Calif. Acad. Sci., ser. 2, 1(13): 251 1888.
This name was in version 1 of The Plant List, record tro-50084629.