Original Description:The Cactaceae 1
p.31 - Britton & Rose (1920)
Stems low, 1 dm high or less; spreading or erect, cylindric, 1.5 cm in diameter, tuberculate; leaves minute, acute; tubercles about as long as broad, arranged in spiral ridges somewhat resembling those of Opuntia whipplei; spines numerous, the radials 12 or more, white, setaceous, 6 mm long, spreading, centrals usually 4, 1 to 1.5 cm long, brownish, the tips and bases often yellowish; glochids numerous, yellowish, 3 to 4 mm long; flowers, in only specimen seen, terminal, almost continuous with the stem; ovary tuberculate and spiny like the stem, deeply umbilicate; seed one, large, flat-winged.
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