Rogers, R.S. & White, C.T. (1920), Contributions to the orchidaceous flora of Queensland, No. 1. Proceedings of the Royal Society of Queensland 32: 121, textfig. 2 [tax. nov.]

• Type: "Kamerunga (Barron River), E. Cowley; Mackay, L.J. Nugent; Daintree River, Gus. Rosenstrom."

Dockrill, A.W. (1969), Australian Indigenous Orchids: 114-115 [secondary reference]

Jacobs, S.W.L. & Pickard, J. (1981), Plants of New South Wales: 34 [secondary reference]

Dunlop, C.R. (1987), Checklist of the Vascular Plants of the Northern Territory. Technical Report: Conservation Commission of the Northern Territory 26: 58 [secondary reference]

Jones, D.L. (1988), Native Orchids of Australia: 352 [secondary reference]

Ross, E.M. in Stanley, T.D. & Ross, E.M. (1989), Orchidaceae. Flora of South-eastern Queensland 3: 368-370 [secondary reference]

Clements, M.A. in Jones, D.L. (ed.) (August 1989), Catalogue of Australian Orchidaceae. Australian Orchid Research 1: 147 [secondary reference]

• Lectotype: " 'Kamerunga (Barron River)', E. Cowley s.n. (lectotype AD! here designated)."

Dockrill, A.W. (1993), Australian Indigenous Orchids Edn. 2, 1: 46-47, Pl. 2 [secondary reference]

Weston, P.H. in Harden, G.J. (ed.) (1993), Zeuxine. Flora of New South Wales 4: 222, pl. 15 [secondary reference]

Hyland, B.P.M., Gray, B. & Elick, R.W. in Cooper, W.E. & Cooper, W.T. (1994), Appendix I: Provisional Species List. Fruits of the Rainforest: 309 [secondary reference]

Bishop, A. (1996), Field guide to the orchids of New South Wales and Victoria Edn. 1: 178-179, Plate 426 [secondary reference]

Bishop, A. (2000), Field guide to the orchids of New South Wales and Victoria Edn. 2: 178-179, Plate 426 [secondary reference]

Brown, A., Dundas, P., Dixon, K. & Hopper, S. (2008), Orchids of Western Australia: 404 [secondary reference]

common name: Common jewel orchid [n/a]

• Etymology: "oblong, alluding to the long flower spike"

Backhouse, G.N., Bates, R.J., Brown, A.P. & Copeland, L.M. (1 March 2016), Checklist of the orchids of Australia including its island territories: 51, 78, 81, 91, 134 [secondary reference]

Council of Heads of Australasian Herbaria (28 February 2018), Australian Plant Census: - APC [secondary reference]

• APC Dist.: WA, NT, Qld, NSW

Jones, D.L. (January 2021), Native Orchids of Australia Edn. 3: 472 [secondary reference]

common name: Common Jewel Orchid [n/a]

Brown, A. (19 July 2022), The Complete Orchids of Western Australia 2: 326 [secondary reference]

common name: Common Jewel Orchid [n/a]

• Etymology: "From the Latin oblongus (oblong), in reference to the long flower spike."

Barrett, R.L., Barrett, M.D. & Clements, M.A. (12 August 2022), A revision of Orchidaceae from the Kimberley region of Western Australia with new species of tropical Calochilus and Dipodium. Telopea 25: 260-262, Figs 1C (map), 22 [secondary reference]

common name: Common jewel orchid [n/a]

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