Jones, D.L. & Clements, M.A. (24 May 1993), New species of Pterostylis R.Br. (Orchidaceae) from Victoria and New South Wales. Muelleria 8(1): 73, fig. 1 a-e [tax. nov.]

• Type: "Victoria, Knocker Track, Omeo, 37°06'S, 147°36'E, 11 Dec. 1989, R.Clark s.n.) (HOLOTYPUS: CBG; ISOTYPI: CBG,MEL)."

• Comment: Published as "Pterostylis aenigma." Noted as possibly being of hybrid origin between P. cucullata and P. furcata (p. 75), but this is in error (D.L.Jones pers. comm. 2005). " P. furcata" should read P. falcata.

Jones, D.L. in Walsh, N.G. & Entwisle, T.J. (ed.) (1994), Pterostylis. Flora of Victoria Edn. 1, 2: 819 [secondary reference]

Bishop, A. (1996), Field guide to the orchids of New South Wales and Victoria Edn. 1: 70, Plate 172 [secondary reference]

Bishop, A. (2000), Field guide to the orchids of New South Wales and Victoria Edn. 2: 70, Plate 172 [secondary reference]

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: 136 [secondary reference]

• APC Dist.: Vic

Ross, J.H. & Walsh, N.G. (June 2003), A Census of the Vascular Plants of Victoria Edn. 7: - [secondary reference]

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

taxonomic synonym: Pterostylis sp. aff. cucullata (Omeo) [n/a]

• APC Comment: A hybrid taxon involving Pterostylis cucullata subsp. sylvicola and P. alpina or P. falcata (fide D.L.Jones, Austral. Orchid Res. 5: 87 (2006)).
• APC Dist.: Vic

Jones, D.L. (January 2021), Native Orchids of Australia Edn. 3: 520-521 [secondary reference]

common name: Enigmatic Greenhood [n/a]

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