Spach, E. (15 August 1838), Histoire Naturelle des Vegetaux. Phanerogames 9: 32 [comb. nov.]

basionym: Heliotropium II Orthostachys R.Br. legitimate

Johnston, I.M. (1928), I. Studies in the Boraginaceae - VII. Contributions of the Gray Herbarium of Harvard University 81: 46 [secondary reference]

• Lectotype: H. foliatum R.Br.

Craven, L.A. (13 September 1996), A taxonomic revision of Heliotropium (Boraginaceae) in Australia. Australian Systematic Botany 9(4): 554 [nomenclatural synonym]

nomenclatural synonym of: Heliotropium II Orthostachys R.Br. legitimate

Craven, L.A. (13 September 1996), A taxonomic revision of Heliotropium (Boraginaceae) in Australia. Australian Systematic Botany 9(4): 533 [taxonomic synonym]

taxonomic synonym of: Heliotropium L. legitimate

Council of Heads of Australasian Herbaria (2006), Australian Plant Census: - [taxonomic synonym]

taxonomic synonym of: Heliotropium L. legitimate

Feuillet, C. (25 February 2016), Two new combinations in Euploca Nutt. (Heliotropiaceae, Boraginales) and a conspectus of the species of the Guiana Shield area. Phytokeys 61: 102 [taxonomic synonym]

taxonomic synonym of: Euploca Nutt. legitimate

Council of Heads of Australasian Herbaria (2019), Australian Plant Census: - [taxonomic synonym]

taxonomic synonym of: Heliotropium L. legitimate

Council of Heads of Australasian Herbaria (29 September 2022), Australian Plant Census: - [taxonomic synonym]

taxonomic synonym of: Euploca Nutt. legitimate

---