Bester, S.P. & Paiva, J. (2015)

The first records of Polygala westii (Polygalaceae) for South Africa (North-West Province) and a key to the southern African Polygala species in the Section Tetrasepalae

. Phytotaxa 202 (3): 198–206. https://doi.org/10.11646/phytotaxa.202.3.3