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

basionym: Ionidium vernonii F.Muell. legitimate

• Comment: Combination made by indirect reference to the basionym.

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 vernonii F.Muell. legitimate

Domin, K. (1928), Beitrage zur Flora und Pflanzengeographie Australiens. Bibliotheca Botanica 22(89): 984 [nomenclatural synonym]

nomenclatural synonym of: Hybanthus enneaspermus var. vernonii (F.Muell.) 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): 238-239 [secondary reference]

nomenclatural synonym: Ionidium vernonii F.Muell. legitimate nomenclatural synonym: Calceolaria vernonii (F.Muell.) Kuntze legitimate nomenclatural synonym: Hybanthus enneaspermus var. vernonii (F.Muell.) Domin legitimate

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

nomenclatural synonym: Hybanthus enneaspermus var. vernonii (F.Muell.) Domin legitimate

Adams, L.G. & George, A.S. in George, A.S. (ed.) (1982), Violaceae. Flora of Australia 8: 105-106 APC [secondary reference]

nomenclatural synonym: Ionidium vernonii F.Muell. legitimate nomenclatural synonym: Calceolaria vernonii (F.Muell.) Kuntze legitimate nomenclatural synonym: Hybanthus enneaspermus var. vernonii (F.Muell.) Domin legitimate

• APC Dist.: NSW, Vic

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: 32 [nomenclatural synonym]

nomenclatural synonym of: Pigea vernonii (F.Muell.) P.I.Forst. legitimate

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