Ten dioecious plants:

1. Ginkgo (Ginkgo biloba)
2. Sago Cycad (Cycas revoluta)
3. American persimmon (Diospyros virginiana)
4. Sassafras (Sassafras albidum)
5. Date Palm (Phoenix dactylifera)
6. Rimu (Dacrydium cupressinum)
7. Spinach (Spinacia oleracea)
8. Holly (Ilex aquifolium)
9. Asparagus (Asparagus officinalis)
10. Cannabis (Cannabis sativa)

rustydog wanted to see sassafras mentioned in a list, and for a change I thought I'd go with the obvious interpretation of the request instead of posting, say, a list of suburbs of Melbourne. Dioecious plants, by the way, are those on which the male and female reproductive organs are found on separate indviduals of the same species. Dr. Bob and Wikipedia were very helpful in compiling this list.