Gardner, C.A. (1923), Contributions to the flora of Western Australia, No. 1. Journal and Proceedings of the Royal Society of Western Australia 9(1): 35-36 [tax. nov.]

• Type: "Near mount Marshall, half a mile south-east of Bencubbin station, in yellow sandy soil, among low shrubs and mallees. ... The type is No. 1696 of the Forests Department's Herbarium."

Melchior, H. in Engler, H.G.A. & Prantl, K.A.E. (December 1925), Violaceae. Die Naturlichen Pflanzenfamilien Edn. 2, 21: 360 [basionym]

basionym of: Hybanthus epacroides (C.A.Gardner) Melch. legitimate

Gardner, C.A. (May 1931), Part III. Geraniaceae–Compositae. Enumeratio Plantarum Australiae Occidentalis: 84 [nomenclatural synonym]

nomenclatural synonym of: Hybanthus epacroides (C.A.Gardner) Melch. legitimate

Bennett, E.M. (14 November 1972), A revision of the Australian species of Hybanthus Jacquin (Violaceae). Nuytsia 1(3): 240 [secondary reference]

• Type: "near mount Marshall, half a mile south-east of Bencubbin Station, 2 June 1922, C.A. Gardner 1696 (holo.: PERTH; iso.: MEL).

Bennett, E.M. (14 November 1972), A revision of the Australian species of Hybanthus Jacquin (Violaceae). Nuytsia 1(3): 240 [nomenclatural synonym]

nomenclatural synonym of: Hybanthus epacroides (C.A.Gardner) Melch. legitimate

Adams, L.G. & George, A.S. in George, A.S. (ed.) (1982), Violaceae. Flora of Australia 8: 109 [nomenclatural synonym]

nomenclatural synonym of: Hybanthus epacroides (C.A.Gardner) Melch. legitimate

Council of Heads of Australasian Herbaria (2005), Australian Plant Census: - [nomenclatural synonym]

nomenclatural synonym of: Hybanthus epacroides (C.A.Gardner) Melch. legitimate

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: 30 [basionym]

basionym of: Pigea epacroides (C.A.Gardner) P.I.Forst. legitimate

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