Lindley, J. (1 January 1840), A Sketch of the Vegetation of the Swan River Colony: liv. [tax. nov.]

• Type: (not cited).

Mueller, F.J.H. von (1882), Systematic Census of Australian Plants: 112 [secondary reference]

Rogers, R.S. in Black, J.M. (1922), Orchidaceae. Flora of South Australia 1: 123 [secondary reference]

taxonomic synonym: Micromyrtus minutiflora Benth. legitimate

• Etymology: Blackened, in allusion to the dark color of the dried plants.

Black, J.M. (1943), Flora of South Australia Edn. 2, 1: 218 [secondary reference]

taxonomic synonym: Microtis minutiflora F.Muell. legitimate

George, A.S. (5 May 1971), A check list of the Orchidaceae of Western Australia. Nuytsia 1(2): 184 [secondary reference]

• Type: Swan River, Drummond - holo.: K-L, iso.: K.

taxonomic synonym: Microtis atrata var. viridula Rchb.f. legitimate

Curtis, W.M. (1980), Angiospermae: Orchidaceae. The Student's Flora of Tasmania 4A: 60, Pl. 8 [secondary reference]

common name: Yellow Onion-orchid [n/a]

Hoffman, N. & Brown, A. (1984), Orchids of South-West Australia: 234-235 [secondary reference]

common name: Swamp Mignonette Orchid [n/a]

Bates, R. (19 June 1984), The genus Microtis R.Br. (Orchidaceae): a taxonomic revision with notes on biology. Journal of the Adelaide Botanic Gardens 7(1): 56-58 [secondary reference]

taxonomic synonym: Microtis minutiflora F.Muell. legitimate taxonomic synonym: Microtis atrata var. viridula Rchb.f. legitimate

Green, J.W. (1985), Census of the Vascular Plants of Western Australia Edn. 2: 56 [secondary reference]

Rye, B.L. in Marchant, N.G., Wheeler, J.R., Rye, B.L., Bennett, E.M., Lander, N.S. & Macfarlane, T.D. (1987), Orchidaceae. Flora of the Perth Region 2: 829 [secondary reference]

common name: Swamp Mignonette Orchid [n/a]

Jones, D.L. (1988), Native Orchids of Australia: 326 [secondary reference]

common name: Tiny Onion Orchid [n/a] common name: Yellow Onion Orchid [n/a]

Clements, M.A. in Jones, D.L. (ed.) (August 1989), Catalogue of Australian Orchidaceae. Australian Orchid Research 1: 94 [secondary reference]

taxonomic synonym: Microtis minutiflora F.Muell. legitimate taxonomic synonym: Microtis atrata var. viridula Rchb.f. legitimate

Bates, R.J. (21 September 1990), Notes on the genus Microtis (Orchidaceae) in Western Australia with the description of two new taxa. Journal of the Adelaide Botanic Gardens 13: 57 [secondary reference]

Bates, R.J. & Weber, J.Z. (7 December 1990), Orchids of South Australia: 98 (map), Fig. 137, Plates 118-119 [secondary reference]

common name: Yellow onion-orchid [n/a]

Hoffman, N. & Brown, A. (1992), Orchids of South-West Australia Edn. 2: 278 [secondary reference]

common name: Swamp Mignonette Orchid [n/a]

Entwisle, T.J. & Bates, R.J. in Walsh, N.G. & Entwisle, T.J. (ed.) (1994), Microtis. Flora of Victoria Edn. 1, 2: 865-866, Fig. 183a-b [secondary reference]

common name: Swamp Onion-orchid [n/a] common name: Yellow Onion-orchid [n/a]

Bishop, A. (1996), Field guide to the orchids of New South Wales and Victoria Edn. 1: 34, Plate 78 [secondary reference]

common name: Tiny Orchid Orchid [n/a] common name: Yellow Onion Orchid [n/a]

Hoffman, N. & Brown, A. (1998), Orchids of South-West Australia Edn. 2 (revised): 278 [secondary reference]

common name: Swamp Mignonette Orchid [n/a]

Jones, D.L., Wapstra, H., Tonelli, P. & Harris, S. (1999), The Orchids of Tasmania: 170 [secondary reference]

common name: Yellow Onion Orchid [n/a]

• Etymology: "blackened (flowers when dried)"

Bishop, A. (2000), Field guide to the orchids of New South Wales and Victoria Edn. 2: 34, Plate 78 [secondary reference]

common name: Tiny Onion Orchid [n/a] common name: Yellow Onion Orchid [n/a]

Paczkowska, G. & Chapman, A.R. (2000), The Western Australian Flora, a descriptive catalogue: 86 [secondary reference]

common name: Swamp Mignonette Orchid [n/a]

Wheeler, J.R., Marchant, N.G. & Lewington, M. (2002), Flora of the South West 1: 373-374 [secondary reference]

common name: Swamp Mignonette Orchid [n/a]

Jones, D.L., Clements, M.A., Sharma, I.S., Mackenzie, A.M. & Molloy, B.P.J. (January 2002), Nomenclatural notes arising from studies into the Tribe Diurideae (Orchidaceae). The Orchadian 13(10): 463 [basionym]

basionym of: Microtidium atratum (Lindl.) 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: 23 [nomenclatural synonym]

nomenclatural synonym of: Microtidium atratum (Lindl.) D.L.Jones & M.A.Clem. legitimate

Barker, W.R., Barker, R.M., Jessop, J. & Vonow, H. (ed.) (18 March 2005), Census of South Australian Vascular Plants 5th Edition. Journal of the Adelaide Botanic Gardens Supplement 1: 198 [secondary reference]

nomenclatural synonym: Microtidium atratum (Lindl.) D.L.Jones & M.A.Clem. legitimate taxonomic synonym: Microtis minutiflora F.Muell. legitimate taxonomic synonym: Microtis atrata var. viridula Rchb.f. legitimate

Brown, A., Dundas, P., Dixon, K. & Hopper, S. (2008), Orchids of Western Australia: 222 [secondary reference]

common name: Swamp mignonette orchid [n/a]

• Etymology: "darkened, alluding to the colouration of the flowers when pressed"

Hoffman, N. & Brown, A. (2011), Orchids of South-West Australia Edn. 3: 335 [secondary reference]

common name: Swamp Mignonette Orchid [n/a]

• Etymology: "... its flowers turn completely black when dried, a feature that gives rise to the scientific name 'atrata' meaning blackened."

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: 29, 96, 106, 114, 130 [secondary reference]

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

nomenclatural synonym: Microtis atrata Lindl. var. atrata legitimate nomenclatural synonym: Microtidium atratum (Lindl.) D.L.Jones & M.A.Clem. legitimate taxonomic synonym: Microtis minutiflora F.Muell. legitimate taxonomic synonym: Microtis atrata var. viridula Rchb.f. legitimate pro parte misapplication: Caladenia cucullata Fitzg. legitimate by Curtis, W.M. (1980), Angiospermae: Orchidaceae. The Student's Flora of Tasmania 4A: 111

• APC Comment: Treated as Microtidium atratum in Tas.
• APC Dist.: WA, SA, Vic, Tas

Jones, D.L. (January 2021), Native Orchids of Australia Edn. 3: 391 [nomenclatural synonym]

nomenclatural synonym of: Microtidium atratum (Lindl.) D.L.Jones & M.A.Clem. legitimate

Brown, A. (19 July 2022), The Complete Orchids of Western Australia 2: 42 [secondary reference]

common name: Swamp Mignonette Orchid [n/a]

• Etymology: "From the Latin atratus (clothed in black, mourning), in reference to the dark coloration of the flowers when pressed."

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