Linnaeus, C. [filius] (April 1782), Supplementum Plantarum: 47-48 [tax. nov.]

Cronquist, A.J. (1981), An Integrated System of Classification of Flowering Plants: 953 [secondary reference]

Brummitt, R.K. (1992), Vascular Plant Families and Genera: 666 [secondary reference]

Fischer, E. in Kubitzki, K. (ed.) (2004), Scrophulariaceae. The Families and Genera of Vascular Plants 7: 419-420 [secondary reference]

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 159 [secondary reference]

Council of Heads of Australasian Herbaria (2010), Australian Plant Census: - APC [secondary reference]

• APC Dist.: Vic (naturalised)

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