Aylostera flavistyla (F. Ritter) Mosti & Papini

This is a very distinctive Aylostera, with large clumps of flattened spheroid stems with prominent tubercles, and lots of bright orange flowers with yellow centres in the spring and early summer. The spines and areoles are white and the shape of the stems and arrangement of the tubercles give the plant an easily recognisable look.

The description is here.

Plants of this species in the collection include:

Aylostera flavistyla

Aylostera flavistyla FR756