Mueller, F.J.H. von (1859), Contributiones ad Acaciarum Australiae Cognitionem. Journal of the Proceedings of the Linnean Society, Botany 3: 136 [tax. nov.]

• Type: "In plagis dumoso-rupestribus ad ortum fluvii M'Arthur River, No. 4"

Bentham, G. (5 October 1864), Flora Australiensis 2: 401 [taxonomic synonym]

taxonomic synonym of: Acacia xylocarpa A.Cunn. ex Benth. nom. illeg.

Pedley, L. (20 July 1978), A revision of Acacia Mill. in Queensland, Part 1. Austrobaileya 1(2): 125-126 [secondary reference]

taxonomic synonym: Acacia pityoides F.Muell. legitimate

Maslin, B.R. in Jessop, J.P. (ed.) (1981), Mimosaceae (family and Acacia). Flora of Central Australia: 137 [secondary reference]

taxonomic synonym: Acacia xylocarpa A.Cunn. ex Benth. nom. illeg. taxonomic synonym: Acacia pityoides F.Muell. legitimate

Green, J.W. (1985), Census of the Vascular Plants of Western Australia Edn. 2: 87, 90 [secondary reference]

taxonomic synonym: Acacia xylocarpa A.Cunn. ex Benth. nom. illeg.

Dunlop, C.R. (1987), Checklist of the Vascular Plants of the Northern Territory. Technical Report: Conservation Commission of the Northern Territory 26: 50 [secondary reference]

Pedley, L. (24 September 1987), Racosperma Martius (Leguminosae: Mimosoideae) in Queensland: a checklist. Austrobaileya 2(4): 353 [basionym]

basionym of: Racosperma orthocarpum (F.Muell.) Pedley legitimate

Wheeler, J.R. in Wheeler, J.R. (ed.) (1992), Mimosaceae. Flora of the Kimberley Region: 317, Fig. 92D [secondary reference]

nomenclatural synonym: Racosperma orthocarpum (F.Muell.) Pedley legitimate taxonomic synonym: Acacia xylocarpa A.Cunn. ex Benth. nom. illeg. taxonomic synonym: Acacia pityoides F.Muell. legitimate common name: Needle-leaf Wattle [n/a]

Tindale, M.D. & Kodela, P.G. in Orchard, A.E. & Wilson, A.J.G. (ed.) (2001), Flora of Australia 11B: 216-217, Fig. 46G-I, Map 301 APC [secondary reference]

• Type: McArthur R., [N.T.], F.Mueller 4 ; holo: MEL n.v. ; iso: K.

nomenclatural synonym: Racosperma orthocarpum (F.Muell.) Pedley legitimate taxonomic synonym: Acacia xylocarpa A.Cunn. ex Benth. nom. illeg. taxonomic synonym: Acacia pityoides F.Muell. legitimate

• APC Comment: An intermediate specimen between A. arida and A. orthocarpa is recorded (Fl. Austral. 11B: 217 (2001)). A possible natural hybrid between A. orthocarpa and A. ancistrocarpa is recorded (Fl. Austral. 11B: 217 (2001)).
• APC Dist.: WA, NT, Qld

Maslin, B.R. (9 July 2001), Wattle - Acacias of Australia: - [secondary reference]

nomenclatural synonym: Racosperma orthocarpum (F.Muell.) Pedley legitimate taxonomic synonym: Acacia xylocarpa A.Cunn. ex Benth. nom. illeg. taxonomic synonym: Acacia pityoides F.Muell. legitimate

Maslin, B.R. & van Leeuwen, S. (2008), Wattles of the Pilbara: 44-45 [secondary reference]

common name: Pilbara weeping wattle [n/a]

• Etymology: "The botanical name of Pilbara weeping wattle refers to the straight pods."

Maslin, B.R., van Leeuwen, S. & Reid, J. (2010), Wattles of the Pilbara: - [secondary reference]

common name: Straight-podded Wattle [n/a] common name: Needle-leaf Wattle [n/a] common name: Pilbara Weeping Wattle [n/a]

• Etymology: "The botanical name is derived from the Greek ortho (straight) and carpos (fruit) referring to the straight pod."
• Vernacular: Yartupu (Nyangumarta)

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