Clump-forming, glabrous succulent, up to 300 mm tall, stems leafless, 4-angled, tuberculate, up to 32 mm diam. Flowers ± 3-10, opening together in many, sessile clusters along grooves of stem, pedicels 1-3 mm long. Corolla campanulate, glabrous except for stiff bristles around mouth of tube, smooth, 7-25 mm diam., inside white to pale yellow or pinkish, tube 1-2.5 mm long, lobes spreading, lanceolate, 3-10 x 2-2.5 mm. Corona yellow, outer lobes shortly bifid and pouch-like below, inner adpressed to anthers, without dorsal appendage.