Mueller, F.J.H. von (1876), Fragmenta Phytographiae Australiae 10(85): 81 [comb. nov.]

basionym: Pigea filiformis Ging. legitimate

Mueller, F.J.H. von (1882), Systematic Census of Australian Plants: 6 [secondary reference]

Mueller, F.J.H. von (December 1889), Second Systematic Census of Australian Plants: 10 [secondary reference]

Dixon, W.A. (1906), The Plants of New South Wales: 38 [alternative name]

alternative name: Ionidium filiforme (Ging.) F.Muell. legitimate

Domin, K. (1928), Beitrage zur Flora und Pflanzengeographie Australiens. Bibliotheca Botanica 22(89): 985 [taxonomic synonym]

taxonomic synonym of: Hybanthus monopetalus (Schult.) Domin legitimate

Beadle, N.C.W., Evans, O.D. & Carolin, R.C. (1962), Handbook of the Vascular Plants of the Sydney District and Blue Mountains: 145 [secondary reference]

Bennett, E.M. (14 November 1972), A revision of the Australian species of Hybanthus Jacquin (Violaceae). Nuytsia 1(3): 234 [taxonomic synonym]

taxonomic synonym of: Hybanthus monopetalus (Schult.) Domin legitimate

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

taxonomic synonym of: Hybanthus monopetalus (Schult.) Domin legitimate

Adams, L.G. & George, A.S. in George, A.S. (ed.) (1982), Violaceae. Flora of Australia 8: 104 [taxonomic synonym]

taxonomic synonym of: Hybanthus monopetalus (Schult.) Domin legitimate

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

taxonomic synonym of: Hybanthus monopetalus (Schult.) Domin 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: 31 [taxonomic synonym]

taxonomic synonym of: Pigea monopetala (Schult.) Ging. ex DC. legitimate

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