FREEMAN, C. C. A new combination in Penstemon (Plantaginaceae). Journal of the Botanical Research Institute of Texas, [S. l.], v. 11, n. 2, p. 287, 2017. DOI: 10.17348/jbrit.v11.i2.1069. Disponível em: https://journals.brit.org/jbrit/article/view/1069. Acesso em: 30 apr. 2024.