Smith, G.F. 2026. The taxonomy and nomenclature of Kalanchoe ser. Rotundifoliae, a cluster of small-growing to medium-sized species with narrowly urceolate flowers here included in K. sect. Kalanchoe (Crassulaceae [subfam. Cotyledonoideae] tr. Kalanchoeae), with the description of a new series, K. ser. Hirtae. Phytotaxa. 755, 2 (May 2026), 175–194. DOI:https://doi.org/10.11646/phytotaxa.755.2.3.