Van Wyk, B.-E., Tilney, P.M. & Magee, A.R. 2013. African Apiaceae: a synopsis of the Apiaceae/Umbelliferae of sub-Saharan Africa and Madagascar. Briza Academic Books.
http://pza.sanbi.org/references/van-wyk-b-e-tilney-pm-magee-ar-2013-african-apiaceae-synopsis-apiaceaeumbelliferae-sub