Monoecy

[2] It is a monomorphic sexual system comparable with gynomonoecy, andromonoecy and trimonoecy, and contrasted with dioecy where individual plants produce cones or flowers of only one sex and with bisexual or hermaphroditic plants in which male and female gametes are produced in the same flower.

[2] Darwin noted that the flowers of monoecious species sometimes showed traces of the opposite sex function, suggesting that they evolved via hermaphroditism.

[10][11] It may be beneficial to reducing pollen-stigma interference,[clarification needed] thus increasing seed production.

[17] Maize is monoecious since both pistillate (female) and stamenate (male) flowers occur on the same plant.

Meiosis in maize requires gene product RAD51, a protein employed in recombinational repair of DNA double-strand breaks.

[21] Evolution from dioecy to monoecy probably involves disruptive selection on floral sex ratios.