Crouch, N. R. and 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. Auckland, New Zealand, 632(2), pp. 184–192. doi: 10.11646/phytotaxa.632.2.8.