In the plant kingdom, there are many types of flowers and arrangements of the reproductive parts of the flowers. Plants which have male (staminate) flowers on one plant and female (pistillate) flowers on another plant are said to be dioecious. Plants that have separate male and female flowers on the same plant are called monoecious .
The following genera of landscape plants are monoecious:
Abies sp. - Fir
Alnus sp. - Alder
Betula sp. - Birch
Carpinus sp. - Hornbeam
Castanea sp. - Chestnut
Carya sp. - Hickory
Cedrus sp. - Cedar
Chamaecyparis sp. - False Cypress
Corylus sp. - Hazelnut
Cryptomeria sp.
Cunninghamia sp.
Cupressus sp. - Cypress
Fagus sp. - Beech		 Juglans sp. - Walnut
Larix sp. - Larch
Ostrya sp. - Hop Hornbeam
Picea sp. - Spruce
Pinus sp. - Pine
Platanus sp. - Sycamore, Plane Tree
Pseudolarix sp. - Golden Larch
Pseudotsuga sp. - Douglas Fir
Quercus sp. - Oak
Sciadopitys sp. - Umbrella Pine
Taxodium sp. - Bald Cypress
Thuja sp. - Arborvitae
Tsuga sp. - Hemlock

 
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