Jeffersonia is a genus of only two species, the other being J. dubia, occurring in eastern Asia. The Asian species is somewhat different and sometimes segregated as the monotypic genus Plagiorhegma.
All species found in Jeffersonia
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 9, 2021. https://michiganflora.net/genus.aspx?id=Jeffersonia.