Retzius, A.J. (1791), Observationes Botanicae 6: 31 [tax. nov.]

Harley, R.M., Atkins, S., Budantsev, A.L., Cantino, P.D., Conn, B.J., Grayer, R., Harley, M.M., de Kok, R., Krestovskaja, T., Morales, R., Paton, A.J., Ryding, O. & Upson, T. in Kubitzki, K. (ed.) (2004), Labiatae. The Families and Genera of Vascular Plants 7: 210 [secondary reference]

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 410 [secondary reference]

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