Wight, R. & Arnott, G.A.W. in Wight, R. (1834), Contributions to the Botany of India: 52 [tax. nov.]

• Type: Pentatropis microphylla (Roxb.) Wight & Arn.

Decaisne, J. in Candolle, A.L.P.P. de (ed.) (1844), Asclepiadaceae. Prodromus Systematis Naturalis Regni Vegetabilis 8: 536 [secondary reference]

Bentham, G. (16 December 1868), Flora Australiensis 4: 328 [secondary reference]

taxonomic synonym: Rhyncharrhena F.Muell. legitimate

Mueller, F.J.H. von (1882), Systematic Census of Australian Plants: 94 [taxonomic synonym]

taxonomic synonym of: Doemia R.Br. legitimate

Bailey, F.M. (1913), Comprehensive Catalogue of Queensland Plants: 326 [secondary reference]

Black, J.M. (December 1926), Meliaceae - Scrophulariaceae. Flora of South Australia 3: 463 [secondary reference]

• Etymology: "From Greek pente, five; tropis, keel: alluding to the 5 prominent corona-lobes."

Black, J.M. & Robertson, E.L. (1957), Flora of South Australia Edn. 2, 4: 698 [secondary reference]

• Etymology: "From Greek pente, five; tropis, keel: alluding to the 5 prominent corona-lobes."

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