Sprague & Hutch. 1909 - Sprague TA, Hutchinson J (1909) The Triumfettas of Africa. Journal of the Linnean Society of London, Botany 39(271): 231-276. doi: 10.1111/j.1095-8339.1909.tb01196.x.
There is no corrections for Triumfetta angolensis yet.