Jacquin, N.J. von (1760), Enumeratio Systematica Plantarum: 6, 25 [tax. nov.]

Fischer, E. in Kubitzki, K. (ed.) (2004), Scrophulariaceae. The Families and Genera of Vascular Plants 7: 364 [secondary reference]

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 755 [secondary reference]

Council of Heads of Australasian Herbaria (2011), Australian Plant Census: - APC [secondary reference]

• APC Dist.: Qld (doubtfully naturalised), NI (doubtfully naturalised)

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