Bester, S. P., Herman, P. P. and Klopper, R. R. (2012) “National Herbarium Plant Collecting Programme reveals new country and provincial distribution records from South African National Parks (Apocynaceae, Asteraceae & Xanthorrhoeaceae: Asphodeloideae)”, Phytotaxa. Auckland, New Zealand, 62(1), pp. 44–56. doi: 10.11646/phytotaxa.62.1.9.