long sharp spines. The plants in cultivation are quite variable.
Stem: Flattened depressed-globose to short cylindrical, light green, 10-12
cm in diameter and tall.
Ribs: Up to 35, wavy with a triangular section,
Areoles: With white felt;
Central spines: 1 per areole, solitary, white or pale with brown tips, 4
to 8 cm long, more or less flattened, porrect, rigid and very
Radial spines: 5 or 6 short yellowish spines, the upper ones longer, up
to 3 cm long.
Flowers: Large white or pink (the
largest of the genus).
Fruits: becoming dry.
Seeds: Obovate, 1,5 mm long, brownish-grey, shining, finely