Monoecious and Dioecious Plants

Most plant have bisexual flowers with functional male and

female flowers. Some are self sterile, requiring pollination

from another plant to produce seed.

Dioecious plants have male (staminate) flowers on one plant,

and female (pistillate) flowers on another plant. Some of

these plants are polygamo-dioecious, with some male flowers on

female plants and some female flowers on male plants.

Ilex or Hollies are Dioecious, and a male plant should be planted

with several female plants for good fruit production.

Monoecious plants have separate male and female flowers on

the same plant. 

Quercus or Oaks are Monoecious plants.

Many plants are Monoecious, but a much smaller number

of plants are Dioecious.

[Dioecious Plants]

Acer - some species, like Acer negundo - Box Elder

Actinidia - Kiwi Fruit Vine

Ailanthus - Tree of Heaven

Aucuba - Non Hardy Dogwood Family plant

Araucaria - Indoor Norfolk Island Pine

Broussonetia - Paper Mulberry

Celastrus - Bittersweet Vine

Cephalotaxus - Plum Yew

Cercidiphyllum - Kadsura Tree

Chionanthus - Fringe Tree

Cotinus - Smoke Tree

Comptonia- in Bayberry Family

Diospyros- Persimmon

Eucommia - Hardy Rubber Tree

Fraxinus - Ash Trees

Ginkgo

Gleditsia - Honey Locust; Polygamo-dioecious

Hippophae - Sea Buckthorn

Ilex - Holly

Juniperus - Juniper

Lindera - Spicebush; Dioecious to polygamo-dioecious

Maclura - Osage Orange

Morus - Mulberry

Myrica - Bayberry

Nemopanthus - Mountain Holly

Phellodendron - Amur Cork Tree

Podocarpus

Populus - Poplar or Aspen

Salix- Willow

Shepherdia - Buffalo Berry

Taxus - Yew

Torreya - Nutmeg Yew

Zanthoxylum - Prickly Ash

[Monoecious Plants]

Abies - Fir

Alnus - Alder

Betula - Birch

Carpinus - Hornbeam, Ironwood

Castanea - Chestnut

Carya- Hickory

Cedrus - Cedar

Chamaecyparis - False Cypress

Corylus - Hazelnut

Cryptomeria

Cunninghamia

Cupressus - Cypress

Fagus - Beech

Ficus - Fig

Juglans - Walnut

Keteleeria

Larix - Larch

Ostrya- Hop Hornbeam

Picea - Spruce

Pinus - Pine

Platanus - Sycamore, Plane Tree

Pseudolarix - Golden Larch

Pseudotsuga - Douglas Fir

Quercus - Oak

Sciadopitys - Umbrella Pine

Sequoia - Coastal Redwood

Sequoiadendrom - Giant Redwood

Taxodium - Bald Cypress

Thuja - Arborvitae

Tsuga- Hemlock