Martynia is a monotypic genus in the Martyniaceae family consisting of a single species, Martynia annua L., which is commonly known as cat's claw, tiger's claw, iceplant. or Devil's claw. However, the name 'iceplant' may also refer to members of the unrelated plant family Aizoaceae.

It is native to Mexico, Central America and the Caribbean, and has been introduced throughout the tropics. It is now quite common in rural areas of India.

Martynia is used for making beads and ornaments, and has a history of folk medicine uses in the Indian subcontinent.

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