Gymnocalycium baldianum
Native range: Northwest Argentina
Known names: 
Hardiness: Hardy to slightly below freezing if kept dry.
Mature Size: 6" tall and wide, forms a clumping colony
Light: Bright indirect light - full sun
Water: Drought tolerant, water when soil is dry.
Soil: Succulent mix
Dormancy Period: Winter
Pet-Safe: No
Plant Size: 3" pot
 
Gymnocalycium baldianum can range from pink to red and sometimes white.