For Pentalinon
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Endress, M.E., U. Meve, D.J. Middleton, and S. Liede-Schumann. 2018. Apocynaceae. In Kadereit, J., & V. Bittrich. 2018. The families and genera of flowering plants. XV. Flowering plants. Eudicots. Apiales, Gentianales (except Rubiaceae). Springer, Cham. Google Scholar
Hansen, B.F., and R.P. Wunderlin. 1986. Pentalinon Voigt, an earlier name for Urechites Müll. Arg. (Apocynaceae). Taxon 35: 166-168. Google Scholar
Lemke, D.E. 2023p. Pentalinon. In Flora of North America Editorial Committee. 2023c. Flora of North America north of Mexico. Volume 14, Magnoliophyta: Gentianaceae to Hydroleaceae. Oxford Univ. Press, New York, NY. 505 pp. Google Scholar
Ward, D.B. 2001. New combinations in the Florida flora. Novon 11: 360-365. Google Scholar
Woodson, R.E., Jr. 1936a. Studies in the Apocynaceae. The American genera of Echitoideae. IV. Ann. Missouri Bot. Garden 23: 169-439. Google Scholar