Xerophyte

Habit

Plants solitary or clustering.

Central Spines

1-3, sometimes absent 20-50 mm long.

Seeds

Bell shaped, 1-1,2 mm long 0,6-0,8 mm broad, widest at hilum, shiny nearly black.

Flowers

Lemon yellow to golden yellow, 4-4,5 cm long, 4,5-6,5 cm in diameter; pericarpels and floral tubes, about 3,2 cm long, densely clothed with wool and bristles.

Spines

Needle-like, straight to slightly arched, pale yellow to brown or reddish, later grey.

Ribs

23-30 (fewer in immature specimens), well defined, straight, acute.

Stem

Depressed spherical, becoming cylindrical with age, green, to 10-50 cm high and 8-20 cm in diameter.

Radial Spines

5 to 8.

Fruits

Globose to ovoid, brownish, with dense wool and bristles, dry at maturity, 1-1,5 cm in diameter.

Areoles

Very woolly apically, later less so only 3-4 mm apart.