For Zanthoxylum
Appelhans, M.S., N. Reichelta, M. Groppoc, C. Paetzolda, and J. Wen. 2018. Phylogeny and biogeography of the pantropical genus Zanthoxylum and its closest relatives in the proto-Rutaceae group (Rutaceae). Molec. Phyl. Evol. 126: 31-44.
Kubitzki, K., ed. 2011. The families and genera of vascular plants. X. Flowering plants – Eudicots – Sapindales, Cucurbitales, Myrtaceae. Springer, Berlin. 436 pp.
Porter, D.M. 1976. Zanthoxylum (Rutaceae) in North America north of Mexico. Brittonia 28: 443-447.
Reynel, C. 2017. Zanthoxylum (Rutaceae). Flora Neotropica Monograph 117. NY Botanical Garden Press, Bronx, NY, USA.
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