1. Carpels and stigmas 6; groups of mature fruits broadly rounded at base, about 1 (–3) times as long as broad (or even shorter), the central axis not winged.
1. Carpels and stigmas 3; groups of mature fruits narrowly tapered to base (the individual follicles very sharp-pointed basally), about 5–7 times as long as broad. the central axis winged.
All species found in Triglochin
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 18, 2018. https://www.michiganflora.net/genus.aspx?id=Triglochin.