The genus Namibia occurs in southwestern Namibia. The plants form dense clumps. The thick, succulent leaves are slightly three sided and fused at the base. Large and soft, the leaves are velvety with a waxy surface. There are four to six pairs of leaves per branch. The plants flower from mid-winter to late spring. The two species are difficult to distinguish unless in flower or fruit -- the main difference being that N. ponderosa opens during the day and closes in the evening; while N. cinerea opens in the morning and stays open. Plants prefer a sandy loam and lots of light and should be kept dry during the summer. However, as Steven Hammer pointed out, being fog-dependent in habitat, they enjoy being misted now and then. They are propagated by seed.