dioecious

Describing plants in which the female and male reproductive organs are  separated   on  different  individuals.
Dioecy makes cross fertilization obligatory and ensures genetic variability in the population but this is done at the cost of lower seed-setting efficiency and also prevents isolated individuals reproducing. The sex of a dioecious plant is thought to be determined by *sex chromosomes, as in red campion (Silene dioica). Compare hermaphrodite , monoecious. See also dicliny.