Gymnocalycium hamatum F. Ritter

Gymnocalycium hamatum was discovered by Friedrich Ritter near Palos Blancos, Bolivia in 1958. He validly described the plant in "Kakteen in Suedamerika" Band 2: 663-664, 1980 (Cacti of South-America, vol 2 p663-664, 1980). Up to now G. hamatum was only ever found near its type habitat Palos Blancos. The plants are easily distinguished from G. megatae. Argentina-based G. marsoneri (Province Salta) are closely related to these plants.

G. hamatum
Habitat VoS 67 near Palos Blancos Bolivia, Altitude 864m	We found plants with a diameter of up to 180 mm	Rare unification	The thorns are light brown to auburn