Phaliso, N., Mckenzie, R.J., Netnou-Nkoana, N.C., Karis, P.O. & Barker, N.P. (2016)

Reassessing taxonomic relationships in the Berkheya clade (Asteraceae, Arctotideae–Gorteriinae): the utility of achene morphology

. Phytotaxa 246 (1): 1–22. https://doi.org/10.11646/phytotaxa.246.1.1