cleistogamou

{ a. [ Gr. &unr_; closed (fr. &unr_; to shut) + ga`mos marriage. ] (Bot.) Having, beside the usual flowers, other minute, closed flowers, without petals or with minute petals; -- said of certain species of plants which possess flowers of two or more kinds, the closed ones being so constituted as to insure self-fertilization. Darwin. [ 1913 Webster ]