1. Leaves with toothed blades and 1–2 prominent saucer-like glands at the summit of the petiole.
1. Leaves with entire blades and without glands.
All species found in Croton
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 19, 2017. http://michiganflora.net/genus.aspx?id=Croton.