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Hydnocarpus (family Flacourtiaceae) A genus of trees in which the flowers are unisexual and small. The fruits are large, globose, woody, indehiscent, and contain many seeds set in pulp. The seeds contain fatty acids, from which chaulmoogra oil (from H. anthelmintica and H. kurzii) is obtained. It is used to treat skin diseases and was formerly used to treat leprosy. There are about 40 species, found in rain forests from India to the Philippines and Celebes.