Lipscomb, Barney. « Flora of North America North of Mexico, Volume 14, Magnoliophyta: Gentianaceae to Hydroleaceae ». Journal of the Botanical Research Institute of Texas 17, no. 2 (novembre 15, 2023): 540. Consulté le mai 17, 2024. https://journals.brit.org/jbrit/article/view/1332.