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Related to Melon cactus: Melocactus
|(Bot.)||A genus of cactaceous plants (Melocactus) having a fleshy and usually globose stem with the surface divided into spiny longitudinal ridges, and bearing at the top a prickly and woolly crown in which the small pink flowers are half concealed|
|The related genus Mamillaria, in which the stem is tubercled rather than ribbed, and the flowers sometimes large. See Illust. under Cactus.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.