Gildenhuys, S.D. and Klopper, R.R. 2016.

A synoptic review and new infrageneric classification for the genus Haworthiopsis (Xanthorrhoeaceae: Asphodeloideae)

. Phytotaxa. 265, 1 (Jun. 2016), 1–26. DOI:https://doi.org/10.11646/phytotaxa.265.1.1.