Light shade to full sun
Southern Brazil, Uruguay, northern Argentina
Clumping columnar cactus, up to 45 cm tall , 10 cm in diameter
Moderate water during the growing season, keep the plant dry in winter
Native from southern Brazil to Uruguay. Stem is solitary, spherical to cylindrical, to 10cm across, 25cm high. Plants are almost entirely covered in soft, white spines. Has 30 to 35 low, blunt ribs, closely spaced , small tubercles. Areoles each have about 40 slender, radial spines. Has multiple bright yellow "straw flower" looking blooms.
Likes strong sunlight, but keep shaded during extended hot periods.
Reported to contain unspecified alkaloids.