Original Description:The Cactaceae 4
p.18 - Britton & Rose (1920)
Globular to short-oblong, 4 to 6 cm long; tubercles arranged in long spirals, somewhat imbricated, a little flattened dorsally; radial spines 10 to 15, white, widely spreading, about 1 cm long; central spines 1 to 3, much stouter than the radials, elongated, 2 to 3 cm long, black; flowers not seen; fruit small globular, almost hidden by the spines, greenish, thin-walled, dry; seeds black, tuberculate, 1.5 mm in diameter; hilum large, basal, white lunate
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