Marah (the manroots, wild cucumbers, or cucumber gourds) are flowering plants in the gourd family (Cucurbitaceae), native to western North America. The genus (which Kellogg noted was characterized by extreme bitterness) was named for Marah in Exodus 15:22–25, which was said to be named for the bitter water there.

Except for the isolated range of Marah gilensis (Gila manroot) in west-central Arizona and island populations (M. macrocarpus var. major), all manroot species inhabit overlapping ranges distributed from Southern Canada to Northern Mexico. Although Marah oreganus (coastal manroot) extends inland into Idaho, all other manroot species except M. gilensis are confined to areas within 300 km of the Pacific Ocean coast.

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