Plants very large, thick, cylindric and many-ribbed, or low and several-ribbed, the top clothed with a dense mass of wool or nearly naked; aréoles very spiny, large, those on the upper part of old plants sometimes united ; flowers from the crown of the... The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family - Page 164 by Nathaniel Lord Britton, Joseph Nelson Rose - 1922 Full view -
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