ANTIDESMA, in botany, a genus of the diccia order, belonging to the pentandria class of plants. The calix of the male consists of five leaves; it has no corolla: The calix of the female is entire, gaping a little on one side; it has no corolla, but two styli, and a double-valved capsule inclosed in the calix. There is but one species of the antidesma, viz. the alexteria, a native of India.