Swanepoel, W., Nanyeni, L. & 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): 1–13. https://doi.org/10.11646/phytotaxa.561.1.1