This is a very large, predominantly tropical family, of which a single genus ranges into temperate North America. The leaves in the entire family typically have 3 or more prominent longitudinal veins from the base, and are opposite; the anthers open by apical pores.
Key to the species of Rhexia.
All species found in Melastomataceae
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 19, 2019. https://www.michiganflora.net/family.aspx?id=MELASTOMATACEAE.