Original Description:The Cactaceae 4
p.80 - Britton & Rose (1920)
Plants large for the genus, globular to short-oblong, 15 to 20 cm high, slightly depressed at apex; tubercles 1 to 1.5 cm long, 4-angled throughout, somewhat blusih, naked in their axils, milky; spine-areoles when young short-floccose, in age glabrate, circular; radial spines 10 to 14, white, but with brown tips, somewhat spreading, stiff-acicular; central spines 2, much longer and stouter than the radials, slightly diverging, bluish brown; flowers from near top of plant but from axils of old tubercles, campanulate, 2 cm long; outer perianth-segments ovate-lanceolate, greenish white with a reddish-brown mid-rib; inner perianth-segments narrow, acuminate, white; filaments short, pinkish; style pinkish; stigma-lobes linear, 6 or 7, green.
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