in botany: A genus of the hexandria order, belonging to the dioecia clas of plants; and in the natural method ranking under the 11th order, *Samentaceae*. The male calyx is expartite; there is no corolla. The female calyx as in the male, without any corolla; there are three styles; the fruit is roundish with an oblique wing, inferior. There are three species, the haftata, cordata, and quinquefolia.