Smith, G. F. Expanding and Subdividing the Southern and South-Tropical African Kalanchoe [subg. Kalanchoe] Sect. Raveta (Crassulaceae Subfam. Kalanchooideae): Description of K. [sect. Raveta] Ser. Raveta, K. [sect. Raveta] Ser. Longiflorae, and K. [sect. Raveta] Ser. Rotundifoliae. Phytotaxa 2024, 655, 1-20.