Plant Sex

I began my Dendrology laboratory this past Wednesday and we touched on the concept of monoecious and dioecious. Generally speaking, monoecious plants have unisexual flowers( seperate male and female flowers) that occur on the same plant. Dioecious plants also have unisexual flowers but they occur on separate plants, as in male flowers on one plant and female on another. However, Despite all the different times I have heard this, I still get a little confused. Michael G. Simpson does a nice job of explaining this concept and the different variations that occur on this monoecious-dioecious spectrum in his textbook, Plant Taxonomy:

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