For Stylosanthes
Isely, D. 1998. Native and naturalized Leguminosae (Fabaceae) of the United States (exclusive of Alaska and Hawaii). Monte L. Bean Life Science Museum, Brigham Young Univ., Provo, UT.
Mohlenbrock, R.H. 1957. A revision of the genus Stylosanthes. Ann. Mo. Bot. Gard. 44(4): 299-355.