Hopper, S.D. & Brown, A.P. (30 June 2006), Australia's wasp-pollinated flying duck orchids revised (Paracaleana: Orchidaceae). Australian Systematic Botany 19(3): 229-230, Figs 2, 14, 15 (map) [tax. nov.]

• Type: "Granite rock 1.5 km SE of Blue Rock, Jarrahdale-Albany Highway road, 32˚20'01"S, 116˚07'58"E, 21 Oct. 2003, G. Brockman 1117. holo: PERTH 06734693!."

• Etymology: "Named from the Latin gracilis (slender) and cordatum (heart-shaped), alluding to the distinctive leaves."

Brown, A., Dundas, P., Dixon, K. & Hopper, S. (2008), Orchids of Western Australia: 236 [secondary reference]

common name: Slender-leafed duck orchid [n/a]

• Etymology: "slender heart shaped, alluding to the leaf shape"

Hoffman, N. & Brown, A. (2011), Orchids of South-West Australia Edn. 3: 255 [secondary reference]

common name: Slender-leafed Duck Orchid [n/a]

• Etymology: "The orchid has a narrowly heart-shaped leaf, hence the Latin name which is derived from gracilis (slender) and cordatum (heart-shaped)."

Miller, J.T. & Clements, M.A. (30 June 2014), Molecular phylogenetic analyses of Drakaeinae: Diurideae (Orchidaceae) based on DNA sequences of the internal transcribed spacer region. Australian Systematic Botany 27(1): 16 [basionym]

basionym of: Caleana gracilicordata (Hopper & A.P.Br.) M.A.Clem. legitimate

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: 30, 130 [secondary reference]

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

nomenclatural synonym of: Caleana gracilicordata (Hopper & A.P.Br.) M.A.Clem. legitimate

Hopper, S.D. & Brown, A.P. (10 December 2019), Update on generic and specific nomenclature in Paracaleana (Drakaeinae), Caladeniinae and a new name in Caladenia (Orchidaceae). Nuytsia 30: 280 [secondary reference]

Jones, D.L. (January 2021), Native Orchids of Australia Edn. 3: 291 [taxonomic synonym]

taxonomic synonym of: Sullivania gracilicordata D.L.Jones nom. inval.

Clements, M.A. & Jones, D.L. (19 November 2021), Notes on Australasian Orchidaceae 7: updates on the nomenclature of Sullivania (Diurideae: Drakaeinae). Lankesteriana 21(3): 316 [basionym]

basionym of: Sullivania gracilicordata (Hopper & A.P.Br.) D.L.Jones legitimate

Brown, A. (19 July 2022), The Complete Orchids of Western Australia 2: 70 [secondary reference]

common name: Slender-leafed Duck Orchid [n/a]

• Etymology: "From the Latin gracilis (slender) and -cordatum (heart-shaped), in reference to the narrowly heart-shaped leaves."

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