Szlachetko, D.L. (28 February 2001), Genera et species Orchidalium. 1. Polish Botanical Journal 46(1): 26 [tax. nov.]

• Type: O. cycnocephala (Fitzg.) Szlach.

Jones, D.L. & Clements, M.A. in Banks, D.P. (ed.) (28 November 2002), A new classification of Pterostylis R.Br. (Orchidaceae). Australian Orchid Research 4: 80 [pro parte taxonomic synonym]

pro parte taxonomic synonym of: Pharochilum D.L.Jones & M.A.Clem. legitimate

Jones, D.L. & Clements, M.A. in Banks, D.P. (ed.) (28 November 2002), A new classification of Pterostylis R.Br. (Orchidaceae). Australian Orchid Research 4: 72 [pro parte taxonomic synonym]

pro parte taxonomic synonym of: Hymenochilus D.L.Jones & M.A.Clem. legitimate

Jones, D.L., Clements, M.A. & Molloy, B.P.J. in Banks, D.P. (ed.) (28 November 2002), A synopsis of the subtribe Pterostylidinae. Australian Orchid Research 4: 130 [nomenclatural synonym]

nomenclatural synonym of: Hymenochilus D.L.Jones & M.A.Clem. legitimate

Janes, J.K. & Duretto, M.F. (31 August 2010), A new classification for subtribe Pterostylidinae (Orchidaceae), reaffirming Pterostylis in the broad sense. Australian Systematic Botany 23(4): 265 [taxonomic synonym]

taxonomic synonym of: Pterostylis sect. Hymenochilus (D.L.Jones & M.A.Clem.) Janes & Duretto legitimate

Council of Heads of Australasian Herbaria (28 February 2018), Australian Plant Census: - [pro parte taxonomic synonym]

pro parte taxonomic synonym of: Pterostylis R.Br. nom. cons.

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