Bennett, E.M. (14 November 1972), A revision of the Australian species of Hybanthus Jacquin (Violaceae). Nuytsia 1(3): 240, Fig. 9 (map) [tax. nov.]

• Type: "Stockout Creek, Coledale Road, N.S.W., Oct. 1909, J.L. Boorman (holo: NSW 97630)."

Jacobs, S.W.L. & Pickard, J. (1981), Plants of New South Wales: 210 [secondary reference]

Adams, L.G. & George, A.S. in George, A.S. (ed.) (1982), Violaceae. Flora of Australia 8: 106, Map 113 APC [secondary reference]

• APC Dist.: NSW

James, T.A. in Harden, G.J. (ed.) (1990), Violaceae. Flora of New South Wales 1: 440 [secondary reference]

James, T.A. in Harden, G.J. (ed.) (2000), Violaceae. Flora of New South Wales Revised Edition 1: 440 [secondary reference]

Forster, P.I. (24 March 2021), Reinstatement of Pigea Ging., an earlier generic name for the spade flowers previously included in Afrohybanthus Flicker (Violaceae). Austrobaileya 11: 33 [basionym]

basionym of: Pigea vernonii subsp. scabra (E.M.Benn.) P.I.Forst. legitimate

---