Bennett, E.M. (14 November 1972), A revision of the Australian species of Hybanthus Jacquin (Violaceae). Nuytsia 1(3): 233, Fig. 5 (map) [tax. nov.]

• Type: "5 miles south of Ravensthorpe, in heavy brown clay, W.A., 16 May, 1968. E.M.Bennett 2195 (holo: PERTH)."

Adams, L.G. & George, A.S. in George, A.S. (ed.) (1982), Violaceae. Flora of Australia 8: 108, Map 118 APC [secondary reference]

taxonomic synonym: Hybanthus floribundus var. pinifolia Domin legitimate

• APC Dist.: WA

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: 28 [basionym]

basionym of: Pigea adpressa (E.M.Benn.) P.I.Forst. legitimate

Parker, C.M. & Percy-Bower, J.M. (22 March 2024), Updates to Western Australia’s vascular plant census for 2023. Nuytsia 35: 5 [nomenclatural synonym]

nomenclatural synonym of: Pigea adpressa (E.M.Benn.) P.I.Forst. legitimate

---