Steyn, H.M. and van Wyk, A.E. 2015.

Taxonomic notes on the Acanthopsis disperma-hoffmannseggiana complex (Acanthaceae, tribe Acantheae), with an interim key to members of the genus

. Phytotaxa. 219, 1 (Jul. 2015), 1–26. DOI:https://doi.org/10.11646/phytotaxa.219.1.1.