Cheek, M., and J. M. Onana. “Keetia Nodulosa Sp. Nov. (Rubiaceae - Vanguerieae) of West-Central Africa: Bacterial Leaf Nodulation Discovered in a Fourth Genus and Tribe of Rubiaceae”. Webbia, vol. 79, no. 1, Mar. 2024, pp. 31-46, doi:10.36253/jopt-15946.