Tephrocactus

This is one the best and very priced species.

Tephrocactus alexanderi is a small cactus with spherical or egg-shaped branches, covered with stiff spines and readily detached. The flowers are large pinkish-white.

Beautiful and rare variety with deep purple new shoots. Over time, the shoots become covered with a gray pruinous patina which gives them a very characteristic appearance. Seldom offered for sale.