This name is a synonym of Diogenesia laxa (A.C.Sm.) Sleumer.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12300807) with original publication details: Brittonia 2: 264 1936.
This name was in version 1 of The Plant List, record tro-12300807, and has not been changed.