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.
Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 18, 2025
https://mifloradev.lsa.umich.edu/flora-demo/#/genus/Senna