IRISINE, in botany: A genus of the pentandria order, belonging to the dioecia class of plants; and in the natural method ranking under the 54th order, Miscellanea. The male calyx is diphyllous, the corolla pentapetalous; and there are five nectaria. The female calyx is diphyllous, the corolla pentapetalous; there are two sessile stigmas, and a capsule with flocky seeds.