... brownish or yellowish, about 16, somewhat spreading, those at the top and base of the aréole smaller; central spines none; aréoles when young clothed with dense white wool, this nearly or quite wanting in age; flowers from the youngest growth appearing... The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family - Page 2-6 by Nathaniel Lord Britton, Joseph Nelson Rose - 1922 Full view -
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