Melon cactus
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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. |