The botanical terms Monoecious and Dioecious are two distinct categories of plants based on their reproductive capabilities.
In this article, I will be making the distinction between Monoecious And Dioecious trees and plants, and provide you with an A-Z reference making it easier for you to identify which trees sit within each group.
What are Monoecious And Dioecious Trees and Plants
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Dioecious plants are self-sterile, meaning they require a male and female cultivar to successfully pollinate and produce flowers and thereafter seeds.
The male plants produce staminate flowers with male reproductive capacity, whilst females display pistillate flowers. It is estimated that 29%  of trees are dioecious.
The majority of plants shrubs and trees 43%  are in fact Monoecious (translated as single house), meaning that they are able to complete the entire reproductive process from within a single plant and do not require any form of pollination from another plant.
They carry both male and female flowers for self-pollination. A critical consideration in horticulture and crop production
Winter squash is a great example of this dual function, where we can see thin stemmed male flowers as offshoots from the main vine stem, whilst the female flowers have thicker rounded flower stems. Once pollinated this thick stem swells and develops into a fruit. 
Monoecious plants have separate male and female flowers on the same plant.
Polygamo-dioecious plants have either female and bisexual flowers or male and bisexual flowers on the same plant.
A-Z List Of Dioecious And Monoecious Trees
A-Z Dioecious Trees
A-Z Monoecious Trees
 Popovic, Zorica & Stefanović Marković, Milena & Smiljanic, Miroslava & Matic, Rada & Kostić, Miroslav & Vidaković, Vera & Bojovic, Srdjan. (2012). Sex expression in serbian dendroflora – A case study of Fraxinus ornus var. Angustifolia. Archives of Biological Sciences. 64. 107-111. 10.2298/ABS1201107P
 Botanical Terminology: Flowers, Houses, and Sexual Reproduction. Cindy Haynes