Rebutia marsoneri Werderm.

In cultivation since the 1930s, this species has several varieties and forms, some of which do not occur in the wild. Also, a few other species are regarded by some as forms of Rebutia marsoneri (e.g. R. calliantha, R. kariusiana, R. krainziana, R. wessneriana), and so the range of spination and colour forms depends on which species are included. The original described R. marsoneri has yellow flowers and fine, bristly spines.

The description is here.

Plants of this species in the collection include:

Rebutia marsoneri