in botany: A genus of the tetrandria order, belonging to the monoecia clas of plants; and in the natural method ranking under the 11th order, Sarmentacea. The male involucrem is tetraphyllous and quinqueflorous, with four petals; the female Centenari-involutum is diphyllous and uniflorous; the petals four; the germin inferior; two styles; and a bilocular feed-cafe.