N. R. Crouch, M. Walters, M. Lötter, and G. F. Smith, “A new cliff-dwelling species of Crassula (Crassulaceae: Crassuloideae) from the Mpumalanga Escarpment, Northern Drakensberg, South Africa”, Phytotaxa, vol. 714, no. 1, pp. 69–78, Aug. 2025.