Fischer, Eberhard, Dorothee Killmann, and Ulrich Meve. 2013. “Neoschumannia gishwatiensis (Apocynaceae, Asclepiadoideae-Ceropegieae) from Gishwati Forest, Rwanda—a Third and New Species from a Disjunct African Genus”. Phytotaxa 77 (2). Auckland, New Zealand:19–26. https://doi.org/10.11646/phytotaxa.77.2.1.