Andromonoecy is a breeding system of plant species in which male and hermaphrodite flowers are on the same plant.[1] It is a monomorphic sexual system comparable with monoecy, gynomonoecy and trimonoecy.[2] Andromonoecy is frequent among genera with zygomorphic flowers,[3] however it is overall rare and occurs in less than 2% of plant species. Nonetheless the breeding system has gained interest among biologists in the study of sex expression.[4]