Adromiscus marianae var. immaculatus is quite variable.
This specific variety, according to Mrs. Doreen Court, is widely distributed in southern Namaqualand extending to west of the Roggeveld Mountains.
Adromiscus marianae var. immaculata is a small plant with small leaves that are often warty, canaliculate above, and tapered at both ends.
The smooth leaved form pictured below, I take as var. immaculata based primarily on its distribution south west of the Roggeveld Mountains in the Tanqua Karoo.
Adromiscus marianae var. immaculata from the Tanqua Karoo.