Swanepoel, W., Nanyeni, L. and van Wyk, A.E. 2022.

Petalidium mannheimerae (Acanthaceae), a new species from Namibia and South Africa, with notes on the taxonomic identity of P. parvifolium

. Phytotaxa. 561, 1 (Sep. 2022), 1–13. DOI:https://doi.org/10.11646/phytotaxa.561.1.1.