Chamaecrista absus (syn. Cassia absus), the pig's senna or tropical sensitive pea, is a species of flowering plant in the family Fabaceae, with a worldwide distribution in the tropics and subtropics. An annual herb reaching 60 cm (24 in), it is a common weed of cultivated and waste places, and its seeds are regularly harvested and sold for use in traditional medicine in Africa and Asia.

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