For Sophora
Rudd, V.E. 1972. Leguminosae-Faboideae-Sophoreae. North American Flora Series II, Part 7.
Vincent, M.A., and D.M. Kearns. 2023b. Sophora. Pp. 164-167. In Flora of North America Editorial Committee. 2023a. Flora of North America north of Mexico. Volume 11.1, Magnoliophyta: Fabaceae, part 1. Oxford Univ. Press, New York, NY. 541 pp.
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