Walker, J. B.; Sytsma, K. J.; Treutlein, J.; Wink, M. (2004). "Salvia (Lamiaceae) is not monophyletic: implications for the systematics, radiation, and ecological specializations of Salvia and tribe Mentheae". American Journal of Botany. 91 (7): 1115–25. doi:10.3732/ajb.91.7.1115. PMID21653467.
Walker, J. B.; Sytsma, K. J.; Treutlein, J.; Wink, M. (2004). "Salvia (Lamiaceae) is not monophyletic: implications for the systematics, radiation, and ecological specializations of Salvia and tribe Mentheae". American Journal of Botany. 91 (7): 1115–25. doi:10.3732/ajb.91.7.1115. PMID21653467.