List of sources:
Cape of Good Hope almanac and annual register, 1856, 1857.
Grahamstown Journal, 15 March 1856, p. 2, "Literary, Scientific and Medical Society"; 11 October 1867, p. 3, "Albany Natural History Society".
Gunn, M. & Codd, L.E. Botanical exploration in southern Africa. Cape Town: Balkema, 1981.
Harvey, W.H. & Sonder, O.W. Flora Capensis, being a systematic description of the plants of the Cape Colony, Caffraria, and Port Natal (Vol. 1). Ashford, Kent: Lovell Reeve, 1894 (originally published 1860).
JSTOR Global Plants: Bolton, Daniel. Retrieved on 18 September 2023 from https://plants.jstor.org/stable/10.5555/al.ap.person.bm000045889