For Parkinsonia
Isely, D. 1975. Leguminosae of the United States. II. Subfamily Caesalpinioideae. Memoirs N.Y. Bot. Gard. 25: 1-228.
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.
Krings, A., W. Wall, and A. Broadhead. 2023. Parkinsonia. Pp.68-71. 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.
Robertson, K.R., and Y.-T. Lee. 1976. The genera of Caesalpinioideae (Leguminosae) in the southeastern United States. J. Arnold Arb. 57: 1-53.
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