[Wikipedia] Reproduction: Bengal dayflowers display an enormous diversity in reproductive systems. It produces three types of flowers -male (chasmogamous), hermaphrodite chasmogamous and hermaphrodite cleistogamous. All three types develop on aerial branches, but only hermaphrodite chasmogamous flowers develop on subaerial branches, and only cleistogamous flowers develop on underground branches. Finally, some plants may produce female flowers on aerial branches. Developing flowers are covered in mucilaginous spathes.[7] Flowers are zygomorphic. The petals are blue. The androecium (male organ) has six stamens, of which only three are fertile. One of the fertile stamens is longer and yellow; the other two are shorter and grey in colour. Pollen grains are yellowish coloured and capsule shaped. Pollen grains of Commelina benghalensis The gynoecium (female organ) has three joined carpels. Aerial and subaerial branch flowers have five ovules per ovary; underground branch flowers have three. (link added by Mary Ann Machi)