Buiningii is a species of Uebelmannia cactus. It is spherical and sometimes elongated with greenish red-brown to deep chocolate bodies covered with very small waxy scales is probably the rarest and most endangered of all Brazillian cacti. It is so difficult to find or buy it in the market now.
Frost Tolerance: Avoid any frost
Minimum Avg. Temperature: 60°F (15°C)
Sun Exposure: Light shade to part sun
Origin: Brazil (Minas Gerais: Serra Negra)
Growth Habits: Solitary, dark green stem, often with reddish tinge, covered with minute waxy scales, up to 4 inches tall (10 cm), 3.2 inches in diameter (8 cm); 16 to 18 ribs; close-set areoles; 6 to 8 spines of unequal length, up to 0.6 inch long (15 mm)
Watering Needs: Like humidity in the air
The diurnal funnel-shaped yellow flowers come in summer. They are up to 1 inch long (2.5 cm), 0.8 inch in diameter (2 cm)