Dioecious
A dioecious species is one in which there are male individuals and female individuals. The term is used especially in plants, while "gonochoric" is preferred for animal species. Dioecious species are the opposite of hermaphrodites, or more correctly in plants, monoecious, whose individuals possess both male and female reproductive organs. That is why dioic reproduction is biparental: it always needs two parents.
In plants, dioecious belong to the group of angiosperms and are characterized mainly by having male flowers or female flowers. This characteristic appears in ancient species, such as the ginkgo (Ginkgo biloba), the cycad (Cycas revoluta) and the kiwi (Actinidia deliciosa), but also in some more recent ones, such as pistachio (Pistacia vera). The same genus can have dioecious and other monoecious species; for example in the genus Casuarina (Casuarinaceae).
In animals, it seems that the opposite phenomenon occurs, since the most complex groups, such as arthropods, among the protostomes, and vertebrates, among the deuterostomes, are almost entirely unisexual.