Monoecious

Alder is monoecious. Male flower on right,
last year's female flower on left

In botany, when a plant species produces both pollen and seeds on the same individual plant, that species is described as being monoecious (from Greek for "one household").

The converse, where individuals of a plant species are of a single sex, with male plants which produce only pollen, and female plants which produce only seeds, is dioecious (from Greek for "two households").

Some plants are intermediate, with individuals producing mainly pollen but also some seeds, and other individuals producing mainly seeds but also some pollen. These are known as sub-dioecious.