Don, G. (ed.) in Sweet, R. (1839), Sweet's Hortus Britannicus Edn. 3: 137 [comb. nov.]

basionym: Ceanothus spatulatus Labill. legitimate nomenclatural synonym: Pomaderris spatulata (Labill.) G.Don legitimate

Rye, B.L. (31 July 1996), A synopsis of the genera Pomaderris, Siegfriedia, Spyridium and Trymalium (Rhamnaceae) in Western Australia. Nuytsia 11(1): 130, Fig. 8D (map) [secondary reference]

nomenclatural synonym: Ceanothus spatulatus Labill. legitimate nomenclatural synonym: Pomaderris spatulata (Labill.) Brongn. ex Sweet isonym nomenclatural synonym: Trymalium billardierei Fenzl nom. illeg., nom. superfl. nomenclatural synonym: Cryptandra billardierei F.Muell. nom. illeg., nom. superfl.

Kellermann, J., Rye, B.L. & Thiele, K.R. (2008), Nomenclatural notes, typifications and name changes in Trymalium (Rhamnaceae: Pomaderreae). Transactions of the Royal Society of South Australia 132(1): 24 [secondary reference]

orthographic variant: Trymalium spathulatum Ostenf. orth. var. nomenclatural synonym: Ceanothus spatulata Labill. orth. var. nomenclatural synonym: Ceanothus spatulatus Labill. legitimate nomenclatural synonym: Pomaderris spatulata (Labill.) G.Don legitimate nomenclatural synonym: Trymalium billardieri Fenzl orth. var. nomenclatural synonym: Trymalium billardierei Fenzl nom. illeg., nom. superfl. nomenclatural synonym: Cryptandra billardierei F.Muell. nom. illeg., nom. superfl. taxonomic synonym: Trymalium billardierei var. α dense-tomentosa Fenzl nom. inval. taxonomic synonym: Trymalium billardieri var. α dense-tomentosum Fenzl orth. var.

Council of Heads of Australasian Herbaria (2011), Australian Plant Census: - APC [secondary reference]

orthographic variant: Trymalium spathulatum Ostenf. orth. var. nomenclatural synonym: Ceanothus spatulata Labill. orth. var. nomenclatural synonym: Ceanothus spatulatus Labill. legitimate nomenclatural synonym: Pomaderris spatulata (Labill.) G.Don legitimate nomenclatural synonym: Trymalium billardieri Fenzl orth. var. nomenclatural synonym: Trymalium billardierei Fenzl nom. illeg., nom. superfl. nomenclatural synonym: Cryptandra billardieri F.Muell. orth. var. nomenclatural synonym: Cryptandra billardierei F.Muell. nom. illeg., nom. superfl. nomenclatural synonym: Trymalium spatulatum (Labill.) G.Don var. spatulatum legitimate taxonomic synonym: Trymalium billardierei var. α dense-tomentosa Fenzl nom. inval. taxonomic synonym: Trymalium billardieri var. α dense-tomentosum Fenzl orth. var.

• APC Dist.: WA

Kellermann, J. (7 April 2021), The importance of the ‘h’ – Parahomonymy in Trymalium (Rhamnaceae: Pomaderreae). Swainsona 35: 26, Fig. 1 [secondary reference]

orthographic variant: Trymalium spathulatum Ostenf. orth. var. nomenclatural synonym: Ceanothus spatulata Labill. orth. var. nomenclatural synonym: Ceanothus spatulatus Labill. legitimate nomenclatural synonym: Pomaderris spatulata (Labill.) Brongn. ex Sweet isonym nomenclatural synonym: Pomaderris spatulata (Labill.) G.Don legitimate nomenclatural synonym: Trymalium billardierei var. α dense-tomentosa Fenzl nom. inval. nomenclatural synonym: Trymalium billardieri Fenzl orth. var. nomenclatural synonym: Trymalium billardierei Fenzl nom. illeg., nom. superfl. nomenclatural synonym: Cryptandra billardieri F.Muell. orth. var. nomenclatural synonym: Cryptandra billardierei F.Muell. nom. illeg., nom. superfl. isonym: Trymalium spatulatum (Labill.) Ostenf. isonym

Parker, C.M. & Percy-Bower, J.M. (22 March 2024), Updates to Western Australia’s vascular plant census for 2023. Nuytsia 35: 9 [secondary reference]

nomenclatural synonym: Trymalium spatulatum (Labill.) Ostenf. isonym

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