Dioeciously hermaphrodite (Bot.), having flowers structurally perfect, but practically dioecious, those on one plant producing no pollen, and those on another no ovules.
... various kinds is apparently now in progress; but I may add that some of the species of holly in North America are, according to Asa Gray, in an exactly intermediate condition, or, as he expresses it, are more or less dioeciously polygamous. ... — On the Origin of Species - 6th Edition • Charles Darwin