Green, P.S. (1993), Notes relating to the floras of Norfolk and Lord Howe Islands, IV. Kew Bulletin 48(2): 320, fig. 4 [tax. nov.]

• Type: Lord Howe Island, I.Hutton 649 (K).

Green, P.S. in Wilson, A.J.G. (ed.) (1994), Norfolk Island & Lord Howe Island. Flora of Australia 49: 356 APC [secondary reference]

• APC Dist.: LHI

• Etymology: The epithet comes from the Latin inopinu (unexpected), because it was found unexpectedly and proved to be yet another endemic species on Lord Howe is.

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

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