Neupane, S., Dessein, S., Wikström, N., Lewis, P.O., Long, C., Bremer, B. & Motley, T.J. (April 2015), The Hedyotis-Oldenlandia complex (Rubiaceae: Spermacoceae) in Asia and the Pacific: Phylogeny revisited with new generic delimitations. Taxon 64(2): 317 [comb. nov.]

basionym: Oldenlandia biflora L. legitimate nomenclatural synonym: Hedyotis biflora (L.) Lam. legitimate nomenclatural synonym: Thecagonum biflorum (L.) Babu legitimate

Gibbons, K.L. (June 2020), Hedyotis, Oldenlandia and related genera (Rubiaceae: Spermacoceae) in Australia: New genera and new combinations in an Asian-Australian-Pacific lineage. Taxon 69(3): 536 [secondary reference]

nomenclatural synonym: Oldenlandia biflora L. legitimate nomenclatural synonym: Hedyotis biflora (L.) Lam. legitimate nomenclatural synonym: Thecagonum biflorum (L.) Babu legitimate

Brown, G.K. & Bostock, P.D. (December 2020), Appendix A: New names and name and status changes 2019 to 2020. Introduction to the Census of the Queensland Flora 2020: 18 [secondary reference]

nomenclatural synonym: Oldenlandia biflora L. legitimate

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