Nuttall, T. (1836), Collections towards a Flora of the Territory of Arkansas. Transactions of the American Philosophical Society, n. ser 5: 189 [tax. nov.]

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: 102-103 [secondary reference]

taxonomic synonym: Heliotropium II Orthostachys R.Br. legitimate taxonomic synonym: Orthostachys (R.Br.) Spach legitimate taxonomic synonym: Schleidenia Endl. 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: - APC [secondary reference]

taxonomic synonym: Heliotropium II Orthostachys R.Br. legitimate taxonomic synonym: Orthostachys (R.Br.) Spach legitimate taxonomic synonym: Schleidenia Endl. legitimate taxonomic synonym: Heliotropium sect. Schleidenia (Endl.) Benth. legitimate

• APC Comment: Euploca is included in the circumscription of Heliotropium in Qld.
• APC Dist.: WA, NT, SA, Qld, NSW

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