Choisy, J.D. (1824), Memoires de la Societe de Physique et d'Histoire Naturelle de Geneve 2 (2): 93 [tax. nov.]

• Type: (not designated).

Fitzgerald, W.V. (1918), The Botany of the Kimberleys, north-west Australia. Journal and Proceedings of the Royal Society of Western Australia 3: 114 [secondary reference]

Black, J.M. (December 1926), Meliaceae - Scrophulariaceae. Flora of South Australia 3: 511 [secondary reference]

• Etymology: "From Greek di-, twice; skhisma, separation, cutting: alluding to the 2 sepals."

Black, J.M. & Robertson, E.L. (1957), Flora of South Australia Edn. 2, 4: 769 [secondary reference]

• Etymology: "From Greek di-, twice; skhisma, separation, cutting: alluding to the 2 sepals."

Wheeler, J.R. in Marchant, N.G., Wheeler, J.R., Rye, B.L., Bennett, E.M., Lander, N.S. & Macfarlane, T.D. (1987), Scrophulariaceae. Flora of the Perth Region 2: 584 [secondary reference]

Paczkowska, G. & Chapman, A.R. (2000), The Western Australian Flora, a descriptive catalogue: 531 [secondary reference]

Wheeler, J.R., Marchant, N.G. & Lewington, M. (2002), Dicotyledons. Flora of the South West 2: 883 [secondary reference]

Fischer, E. in Kubitzki, K. (ed.) (2004), Scrophulariaceae. The Families and Genera of Vascular Plants 7: 371-372 [secondary reference]

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 281 [secondary reference]

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

• APC Dist.: WA (naturalised), SA (naturalised)

---