Rebutia wessneriana Bewer

Regarded by some as a form of Rebutia krainziana. Quite a variable plant but usually forms larger bodied stems than other Rebutia, up to 8cm across. Usually red flowers with white stigmas.

The description is here.

Plants of this species in the collection include:

Rebutia wessneriana CL17

Rebutia wessneriana DON433