Trioecy /traɪˈiːsi/, also spelled triecy, is a sexual system characterized by the coexistence of males, females, and hermaphrodites.
[4] The term trioecy comes from the Neo-Latin word Trioecia, a former order of trioecious plants.
[5] Trioecy may be an unstable transient state[6] associated with evolutionary transitioning from gynodioecy to dioecy.
[1] It has been suggested that chromosomal duplication plays an important part in the evolution of trioecy.
[10] Another theoretical analysis indicates that trioecy could be evolutionary stable in plant species if a large amount of pollinators vary geographically.