Smith, G. F. and Crouch, N. R. (2025) “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. Auckland, New Zealand, 714(1), pp. 40–56. doi: 10.11646/phytotaxa.714.1.2.