Thompson, I.R. (5 January 2009), A revision of Asperula and Galium (Rubiaceae: Rubiaceae) in Australia. Muelleria 27(1): 88, Figs 2a, 11 [autonym]

doubtful taxonomic synonym: Galium umbrosum var. bifolium F.Muell. legitimate doubtful misapplication: Galium geminifolium F.Muell. legitimate by Domin, K. (1929), Beitrage zur Flora und Pflanzengeographie Australiens. Bibliotheca Botanica 22(89): 1184

National Herbarium of New South Wales (2009), PlantNET Flora of New South Wales Online: - [secondary reference]

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

doubtful taxonomic synonym: Galium umbrosum var. bifolium F.Muell. legitimate doubtful taxonomic synonym: Galium umbrosum var. bifolia F.Muell. orth. var. doubtful misapplication: Galium geminifolium F.Muell. legitimate by Domin, K. (1929), Beitrage zur Flora und Pflanzengeographie Australiens. Bibliotheca Botanica 22(89): 1184

• APC Comment: Hybrids between G. binifolium subsp binifolium and Galium densum Hook.f. are recorded for Tas.; hybrids between G. binifolium subsp binifolium and Galium gaudichaudii DC. are recorded for NSW and Vic.; and hybrids between G. binifolium subsp binifolium and Galium liratum N.A.Wakef. are recorded for NSW by I.R.Thompson, Muelleria 27(1): 88 (2009).
• APC Dist.: Qld, NSW, Vic

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