Original Description:The Cactaceae 4
p.287 - Britton & Rose (1920)
Plants simple, short-cylindric, 6 dm high or less, up to 3.5 dm in diameter; ribs 24 to 31, with margins undulate; areoles elliptic, rather closely set; spines 20 or more, subulate, very much alike, none hooked, slightly spreading and more or less outwardly recurved, 7 cm long or less, yellow to brownish yellow, annulate; flowers including ovary 5 cm long; perianth segments narrow, yellowish or the outer ones tinged with red, short-acuminate, the margins slightly erose; filaments yellowish below, becoming reddish above; stigma-lobes 8 to 13, flesh-colored; scales on the ovary orbicular; fruit small, 2.5 cm in diameter, the seed dehiscing by a large pore at the base; seeds angled, black, pitted, 2 mm long; hilum small, circular, depressed, white.
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