Jay B. Walker; Kenneth J. Sytsma; Jens Treutlein; Michael Wink (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): 1115–1125. doi:10.3732/ajb.91.7.1115. PMID21653467.
El-Gazzar, A., L. Watson, W. T. Williams, and G. N. Lance (1968). "The taxonomy of Salvia: a test of two radically different numerical methods". Journal of the Linnean Society of London, Botany. 60 (383): 237–250. doi:10.1111/j.1095-8339.1968.tb00087.x.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Jay B. Walker; Kenneth J. Sytsma; Jens Treutlein; Michael Wink (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): 1115–1125. doi:10.3732/ajb.91.7.1115. PMID21653467.