POWELL , A. M. .; POWELL, S. A. .; JACKSON, C. . 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, [S. l.], v. 11, n. 1, p. 143–146, 2017. DOI: 10.17348/jbrit.v11.i1.1145. Disponível em: https://journals.brit.org/jbrit/article/view/1145. Acesso em: 3 oct. 2023.