Crouch, N. R., & Smith, G. F. (2023). Cotyledon mckayi (Crassulaceae subfam. Kalanchooideae), a new cremnophytic species from the central Tugela River Basin of KwaZulu-Natal, South Africa. Phytotaxa, 632(2), 184–192. https://doi.org/10.11646/phytotaxa.632.2.8