Xerophyte

Central Spines

Absent or tiny.

Flowers

Yellowish, around 3 cm long, sunken in the whitish (sometimes dark brown) woolly crown, and enveloped by a layer dark bristles. Outer perianth-segments yellowish or reddish. Inner perianth-segments delicate yellow, wedge shaped. Stygma lobes protruding above the stamens ring.

Ribs

15-20, tubercled, 10-12 mm high, edges very sharp.

Stem

Disc-shaped, about 4 cm high and 6-10 cm wide, glossy light or dark green. Crown woolly.

Radial Spines

6-7, yellowish or whitish, unequal, curved, pliable, not piercing.

Areoles

3-4 per ribs, over the the tubercles, nearly circular, very large, dense yellowish-white, woolly.