Original Description:The Cactaceae 3
p.41 - Britton & Rose (1920)
Plants cespitose, forming large clusters; stems cylindric, 1 to 2 dm long, 4 to 5 cm in diameter; ribs about 10, somewhat tuberculate below, but completely hidden by the stout numerous spines; areoles approximate, 2 to 5 mm apart, white-felted when young; spines numerous, acicular, sometimes 7 cm long, pinkish when quite young, afterward white or yellow with brown or blackish tips, in age becoming gray; flowers only 10 to 12 mm long; perianth-segments oblong, 3 to 4 mm long, ovary minute, strongly tubercled, hidden under the mass of spines; spine clusters on ovary with 6 to 12 white or pinkish tipped spines, half as long as the flower.
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