Welw. ex Baker 1878 - Baker JG (1878) XVII. Report on the Liliaceae, Iridaceae, Hypoxidaceae, and Haemodoraceae of Welwitsch's Angolan Herbarium. Transactions of the Linnean Society of London. 2nd Series: Botany 1(5): 245-273. doi: 10.1111/j.1095-8339.1878.tb00040.x.