Hooker, W.J. & Arnott, G.A.W. in Hooker, W.J. (ed.) (July 1834), Contributions towards a flora of South America and the islands of the Pacific. The Journal of Botany 1: 291 [tax. nov.]

• Type: (not designated).

• Etymology: "The genus is dedicated to Mr. Tweedie, whose botanical researches have greatly extended our knowledge of Extra-tropical South-American plants."

Bullock, A.A. (1958), Nomenclatural notes: VI: Type species of some generic names. Kew Bulletin 13(1): 99 [secondary reference]

• Type: Tweedia macrolepis Hook. & Arn.

Beadle, N.C.W., Evans, O.D. & Carolin, R.C. (1972), Flora of the Sydney Region Edn. 2: 420 [secondary reference]

Jacobs, S.W.L. & Pickard, J. (1981), Plants of New South Wales: 70 [secondary reference]

taxonomic synonym: Oxypetalum R.Br. nom. cons.

Ross, E.M. in Stanley, T.D. & Ross, E.M. (1986), Asclepiadaceae. Flora of South-eastern Queensland 2: 308 [secondary reference]

Harden, G.J. & Williams, J.B. in Harden, G.J. (ed.) (1992), Asclepiadaceae. Flora of New South Wales 3: 530 [secondary reference]

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 881 [taxonomic synonym]

taxonomic synonym of: Oxypetalum R.Br. nom. cons.

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