Eriosyce oculta

This is one of a kind really small-growing plant with low, spineless, it has a beautiful dark purple, almost black stem.

Recommended temperature zone: USDA: 9-11
Frost tolerance: 20°F (7°C)
Minimum avg. temperature: 50°F (10°C)
Sun exposure: Light shade
Origin: Northern Chile (Antofagasta)
Watering needs: Extremely root prone, needs good drainage.
Propagation: Seeds
Blooming habits: Flower yellow to pinkish orange, 1.5" in diameter (3.5 cm)

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