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Smith, G. F. 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 2026, 755, 175-194.