Dorr, Laurence J., and Mac H. Alford. “The Identity and Typification of Valliera Triplinervis (Salicaceae)”. Journal of the Botanical Research Institute of Texas 12, no. 1 (July 20, 2018): 129–131. Accessed December 22, 2024. https://journals.brit.org/jbrit/article/view/921.