1. Leaflets 5–13; spadix very slender and long-tapering, much exceeding the spathe at flowering time.
1. Leaflets 3; spadix shorter than spathe.
All species found in Arisaema
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 25, 2019. https://www.michiganflora.net/genus.aspx?id=Arisaema.