Dioecious

Dioecious, from the Greek oihos, a house, is the term applied to plants in which the two sexes are on distinct individuals. In many species of the wracks (Fucus) the antheridia and oogonia are on separate plants. Among mosses, plants are frequently exclusively male or female, as are the prothallia of most horsetails and some ferns. The heterosporous Pteridophyta bear two kinds of spores, macrospores producing prothallia which bear archegonia, and microspores producing prothallia which bear antheridia. In some flowering plants, such as willows and poplars, and the Aucuba, the carpels, or leaves bearing the ovules (macrosporangia) or female structures, are on distinct plants from the stamens, or leaves bearing the pollen-sacs or microspores, the male structures.