Smith GF, Crouch NR. A review of the nomenclature and identity of Cotyledon mucronata and C. undulata (Crassulaceae subfam. Cotyledonoideae), two names variously applied to undulate leaf-margined material generally included in the synonymy of different varieties of C. orbiculata, with C. mucronata reinstated at the rank of species. Phytotaxa [Internet]. 2025 Aug. 6 [cited 2025 Dec. 5];714(1):40-56. Available from: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.714.1.2