1. Flowers numerous in well-developed racemes; mature fruit flat; leaflets in (6–) 7–8 pairs; gland divergent, near base of petiole.
1. Flowers solitary or few in a cluster; mature fruit ± 4-sided; leaflets mostly in 3 pairs; glands ± appressed to the rachis, between each of the two lowest pairs of leaflets.
All species found in Senna
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 25, 2017. http://michiganflora.net/genus.aspx?id=Senna.