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Salix are generally dioecious — their male and female reproductive parts are on different plants.

In fact, Nepenthes is the only dioecious carnivorous plant.

If you want berries, remember that hollies are dioecious, meaning they come in male and female, and only the female bears fruit.

Willows are dioecious; that is, male trees produce only male flowers, and female trees produce only female flowers.

The former plants are termed self-incompatible hermaphrodites; the latter, dioecious species.