1. Leaves evergreen (overwintering); bracts simple, entire; flowers white to pinkish.
H. niger
1. Leaves ± deciduous; bracts at inflorescence divided and serrate; flowers greenish.
H. viridis
All species found in Helleborus
Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 16, 2018. https://michiganflora.net/genus.aspx?id=Helleborus.