Figueiredo, E. & Smith, G.F. (2020)

Friedrich Welwitsch and his overlooked contributions to the Flora of Tropical Africa, with a discussion of the names of Kalanchoe (Crassulaceae subfam. Kalanchooideae) that should be ascribed to Welwitsch alone

. Phytotaxa 458 (1): 83–100. https://doi.org/10.11646/phytotaxa.458.1.5