The northern wax myrtle and the Pacific wax myrtle may be dioecious or monecious.    From Wordnik.com.  [Homepage] Reference

In the former, the flowers are monecious or perfect, consisting of imbricated solitary bracts.    From Wordnik.com.  [Report of the North-Carolina Geological Survey. Agriculture of the Eastern Counties: Together with Descriptions of the Fossils of the Marl Beds] Reference

Chestnut is monecious.    From Wordnik.com.  [Northern Nut Growers Association Report of the Proceedings at the 44th Annual Meeting Rochester, N.Y. August 31 and September 1, 1953] Reference