A poorly-known species with apparently a very restricted range in the extreme south. The only known specimen conforming to var. pubens is the type, Perrier 9521 from the Mahafaly Plateau near the Menarandra River. Other material of the sp from Cap Ste Marie and Ambovombe shows variation in indument and is otherwise apparently indistinguishable, therefore we refrain from maintaining the vars. until additional material from throughout the range is available.