Cleistogamic
Cleistogamic , adjective
[Greek {not transcribed} closed (from {not transcribed} to shut) + ga`mos marriage.]
(Botany) 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
Also: Cleistogamous