Steyn, H.M. & Wyk, A.E.V. (2017)

Taxonomic notes on Acanthopsis (Acanthaceae, tribe Acantheae): the group with semi-dense spikes and 5-fid bracts

. Phytotaxa 324 (2): 101–121. https://doi.org/10.11646/phytotaxa.324.2.1