in botany: A genus of the trigynia order, belonging to the decandria clas of plants; and in the natural method ranking under the 23rd order, Tribilata. The calyx is quinquepartite, with nectarious pores on the outside of the base; the petals are roundish and ungulated; the seeds are three, with membranaceous wings. There are seven species, all natives of warm countries, but possessing no remarkable properties.