Xerophyte

Central Spines

Absent, or 1-2, protruding, not longer than radials, similar in colour or brownish.

Seeds

Cap-shaped, nearly black, shining, light, 1,5 mm long, 2 mm wide.

Roots

Napiform.

Flowers

Apical, 4 cm long, and over 4 cm wide when fully open, pericarpel 7 mm long, 4 mm thick above, tapering below, tawny brown with small narrow reddish scales, dense grey wool, and reddish-brown fine bristles. Nectaries absent. Flowers tube 8 mm long, 10 mm wide above, pale yellow internally, externally yellowish-green covered as the ovary. Filaments pale yellow, red at base, set up to 2 mm below the upper edge of the tube. Anthers pale yellow. Stylus about 2 cm long, pale yellow, the lowest 2 mm united with the tube with c. 6 pale yellow stigma-lobes 6-7 mm long. Petals 22 mm long, 3-4 mm wide, greenish yellow.

Spines

Pale to orange yellow with a reddish-brown base.

Ribs

13-18, 0.5-1 mm tall, dissolved in round tubercles, only 0.5-1 mm high.

Stem

Cylindrical, bright green, 15-25 mm thick, 3-5 cm high, solitary.

Radial Spines

10-13, 3-4 mm long, acicular, usually straight, all around the areole, spreading sideways or partly erected.

Areoles

On the tubercles, 0.8 mm long, 0,5 mm wide, with reddish-brown felt, later naked, 1-1,5 mm apart.