Celastraceae

1. Leaves alternate; stems usually twining; flowers unisexual (or functionally so), the plants essentially dioecious.

Celastrus

1. Leaves opposite; stems erect or trailing but not twining; flowers bisexual.

Euonymus

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 26, 2017. http://michiganflora.net/family.aspx?id=Celastraceae.