CROUCH, N. R.; SMITH, G. F. Cotyledon mckayi (Crassulaceae subfam. Kalanchooideae), a new cremnophytic species from the central Tugela River Basin of KwaZulu-Natal, South Africa. Phytotaxa, Auckland, New Zealand, v. 632, n. 2, p. 184–192, 2023. DOI: 10.11646/phytotaxa.632.2.8. Disponível em: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.632.2.8. Acesso em: 6 dec. 2025.