Baillon, H.E. (1894), Histoire des Plantes 12: 280, adnot. [comb. nov.]

basionym: Agrostis quadrifida Labill. legitimate

Black, J.M. (1922), Cyatheaceae - Orchidaceae. Flora of South Australia 1: 71 [secondary reference]

taxonomic synonym: Pentapogon billardierei R.Br. nom. illeg., nom. superfl.

Gardner, C.A. (1930), Part I. Pteridophyta-Proteaceae. Enumeratio Plantarum Australiae Occidentalis: 9 [secondary reference]

Black, J.M. (1943), Flora of South Australia Edn. 2, 1: 100 [secondary reference]

taxonomic synonym: Pentapogon billardierei R.Br. nom. illeg., nom. superfl.

Burbidge, N.T. & Gray, M. (1970), Flora of the Australian Capital Territory: 48, Fig. 39. [secondary reference]

common name: Five-awn Spear Grass [n/a]

Jacobs, S.W.L. & Pickard, J. (1981), Plants of New South Wales: 50 [secondary reference]

taxonomic synonym: Pentapogon billardierei R.Br. nom. illeg., nom. superfl.

Jacobs, S.W.L. & McClay, K.L. in Harden, G.J. (ed.) (1993), Pentapogon. Flora of New South Wales 4: 587 [secondary reference]

common name: Fiveawn Speargrass [n/a]

Walsh, N.G. in Walsh, N.G. & Entwisle, T.J. (ed.) (1994), Poaceae. Flora of Victoria Edn. 1, 2: 491, Fig. 95g-h [secondary reference]

nomenclatural synonym: Agrostis quadrifida Labill. legitimate taxonomic synonym: Pentapogon billardierei R.Br. nom. illeg., nom. superfl. common name: Five-awned Spear-grass [n/a]

Macfarlane, T.D. & Hearn, R.W. (23 November 2007), Occurrence and status of Pentapogon quadrifidus (Poaceae) in Western Australia. Nuytsia 16(2): 469-471 [secondary reference]

Council of Heads of Australasian Herbaria (2008), Australian Plant Census: - APC [secondary reference]

orthographic variant: Pentapogon billardieri R.Br. orth. var. orthographic variant: Stipa pentapogon f. effusum F.Muell. orth. var. orthographic variant: Pentapogon quadrifidum Baill. orth. var. nomenclatural synonym: Agrostis quadrifida Labill. legitimate taxonomic synonym: Pentapogon billardierei R.Br. nom. illeg., nom. superfl. taxonomic synonym: Stipa pentapogon F.Muell. f. pentapogon legitimate taxonomic synonym: Stipa pentapogon f. grandiflorum F.Muell. orth. var. taxonomic synonym: Stipa pentapogon f. grandiflora F.Muell. legitimate taxonomic synonym: Stipa pentapogon f. effusa F.Muell. legitimate taxonomic synonym: Stipa pentapogon F.Muell. nom. illeg.

• APC Comment: Infraspecific rank not recognised in NSW.
• APC Dist.: WA, SA, NSW, ACT, Vic, Tas

Jacobs, S.W.L., Whalley, R.D.B. & Wheeler, D.J.B. (2008), Grasses of New South Wales Edn. 4: 335 (fig.) [secondary reference]

common name: Fiveawn Speargrass [n/a]

Kodela, P.G., Weiller, C.M. & Thompson, I.R. in Wilson, A.J.G. (ed.) (2009), Pentapogon. Flora of Australia 44A: 234 [secondary reference]

nomenclatural synonym: Agrostis quadrifida Labill. legitimate nomenclatural synonym: Pentapogon billardieri R.Br. orth. var. nomenclatural synonym: Pentapogon billardierei R.Br. nom. illeg., nom. superfl. nomenclatural synonym: Stipa pentapogon F.Muell. nom. illeg. common name: Five-awned Speargrass [n/a]

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