Original Description:The Cactaceae 4
p.11 - Britton & Rose (1920)
Plants simple, depressed-globose, 8 to 12 cm broad, pale bluish green, strongly tubercled and strongly armed; tubercles conspicuous but low, often wider than long, sometimes 4 cm wide; flowering grove rather conspicuous but narrow, extending from spines to about half-way to axil of tubercle; spines usually 8, sometimes with a smaller accessory one, all ascending from base and curved outward from middle, terete or somewhat angled at base, often highly colored below with sharp yellowish-crimson tips, the longer ones 6 cm long; outer perianth-segments very pale purple, never deep purplish pink; filaments white; anthers deep yellow; style yellowish, pinkish at top; stigma-lobes pinkish yellow.
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