Fitzgerald, R.D. (July 1878), Australian Orchids 1(4): 3rd plate [tax. nov.]

• Type: "I obtained it in a swampy talus at the base of "Hassan's Walls," Bowenfels, and also from the "Guy Faux" pass, near Grafton ... It flowers in February."

• Etymology: "I have named it from its colour, so unlike that of its congeners generally."

Dixon, W.A. (1906), The Plants of New South Wales: 256 [secondary reference]

Sulman, F. (1914), A Popular Guide to the Wild Flowers of New South Wales II: 198, 237 [secondary reference]

Rupp, H.M.R. (January 1944), The Orchids of New South Wales: 89-90 [secondary reference]

Beadle, N.C.W., Evans, O.D. & Carolin, R.C. (1962), Handbook of the Vascular Plants of the Sydney District and Blue Mountains: 467 [secondary reference]

Jacobs, S.W.L. & Pickard, J. (1981), Plants of New South Wales: 32 [secondary reference]

Jones, D.L. (1988), Native Orchids of Australia: 185 [secondary reference]

common name: Scarlet Greenhood [n/a]

Clements, M.A. in Jones, D.L. (ed.) (August 1989), Catalogue of Australian Orchidaceae. Australian Orchid Research 1: 121 [secondary reference]

• Lectotype: "`On a swampy talus at the base of "Hassan's Walls", Bowenfels, and also from the "Guy Faux" pass, near Grafton', Feb., R.D. Fitzgerald s.n. (syn not found; lectotype Fitzgerald's plate CBG! here designated)."

Jones, D.L. in Harden, G.J. (ed.) (1993), Pterostylis. Flora of New South Wales 4: 179 [secondary reference]

Jones, D.L. in Walsh, N.G. & Entwisle, T.J. (ed.) (1994), Pterostylis. Flora of Victoria Edn. 1, 2: 809, Fig. 165a-c [secondary reference]

Bishop, A. (1996), Field guide to the orchids of New South Wales and Victoria Edn. 1: 105, Plate 259 [secondary reference]

common name: Scarlet Greenhood [n/a]

Bishop, A. (2000), Field guide to the orchids of New South Wales and Victoria Edn. 2: 105, Plate 259 [secondary reference]

common name: Scarlet Greenhood [n/a]

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: 71 [basionym]

basionym of: Diplodium coccinum (Fitzg.) D.L.Jones & M.A.Clem. legitimate

Jeanes, J.A. in Ross, J.H. & Walsh, N.G. (June 2003), Orchidaceae. A Census of the Vascular Plants of Victoria Edn. 7: 21, 26 [secondary reference]

nomenclatural synonym: Diplodium coccinum (Fitzg.) D.L.Jones & M.A.Clem. legitimate

Jones, D.L. (2008), Field Guide to the orchids of the Australian Capital Territory: 278 [secondary reference]

• Etymology: "scarlet"

Backhouse, G., Kosky, B., Rouse, D. & Turner, J. (2016), Bush Gems: A Guide to the Wild Orchids of Victoria, Australia: [p. 602 (photo), pp. 623-624 [photos, map) of PDF] [secondary reference]

orthographic variant: Pterostylis coccinea W.A.Dixon orth. var. nomenclatural synonym: Diplodium coccinum (Fitzg.) D.L.Jones & M.A.Clem. legitimate common name: Scarlet Greenhood [n/a]

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: 37, 64, 75, 117 [secondary reference]

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

orthographic variant: Pterostylis coccinea W.A.Dixon orth. var. nomenclatural synonym: Diplodium coccinum (Fitzg.) D.L.Jones & M.A.Clem. legitimate

• APC Comment: Treated as Diplodium coccinum in the ACT.
• APC Dist.: NSW, ACT, Vic

Jones, D.L. (January 2021), Native Orchids of Australia Edn. 3: 478 [nomenclatural synonym]

nomenclatural synonym of: Diplodium coccinum (Fitzg.) D.L.Jones & M.A.Clem. legitimate

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