Included in Nymphaeaceae in Michigan Flora.
1. Principal leaves simple, alternate or basal, floating; stamens 12 or more; flowers reddish, 12 mm or more long.
1. Principal leaves dissected, opposite, submersed (small, alternate, floating, peltate leaves may also be present); stamens 3–6; flowers whitish, less than 12 mm long.
All species found in Cabombaceae
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 19, 2019. https://www.michiganflora.net/family.aspx?id=Cabombaceae.