Powell , A. Michael, Shirley A. Powell, and Chris Jackson. “Documented Chromosome Numbers 2017:1. Miscellaneous Counts Mostly from Western Texas (U.S.A.), One Each from New Mexico (U.S.A.) and Mexico”. Journal of the Botanical Research Institute of Texas 11, no. 1 (July 24, 2017): 143–146. Accessed May 3, 2024. https://journals.brit.org/jbrit/article/view/1145.