Gymnocalycium dopianum

Gymnocalycium dopianum is a variation of G. Andreae. It is a low growing prickly cactus, often branching basally in cultivation to form clusters to 15 cm or more wide. This species is different from the general run of gymnocalyciums in the color of its flowers, in this case a brilliant sulfur-yellow.

Blooming season: Flowers are born in early summer.

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz