Weakley, Alan S., Bruce A. Sorrie, Richard J. LeBlond, Derick B. Poindexter, Aaron J. Floden, Edward E. Schilling, Alan R. Franck, and John C. Kees. 2018. “New Combinations, Rank Changes, and Nomenclatural and Taxonomic Comments in the Vascular Flora of the Southeastern United States. IV”. Journal of the Botanical Research Institute of Texas 12 (2), 461-80. https://journals.brit.org/jbrit/article/view/950.