Menispermum (moonseed) is a small genus of deciduous climbing woody vines in the moonseed family (Menispermaceae). Plants in this genus have small dioecious flowers, and clusters of small grape-like drupes. The name, moonseed, comes from the shape of the seed, which resembles a crescent moon. The word Menispermum is derived from the Greek words μήν (mēn), meaning (crescent) moon, and σπέρμα (sperma) meaning seed. The common name moonseed is also applied to some other species in the related genus Cocculus.

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