Dioecious: adjective; (of a plant or invertebrate animal) having the male and female reproductive organs in separate individuals (Oxford Dictionary).

My example today is the Yew tree (Taxus baccata), which has male and female flowers on separate trees. The male flowers are out now on a couple of trees in my local park – the female flowers may also be out but I didn’t look for them. The males are rather more showy and obvious, especially when they’re not soaking wet and their yellow pollen is blowing in the wind.