SEM micrographs of the adaxial leaf surfaces and the midrib of (A, B) C. alticola (C, D) C. obtusicalyx B close-up of C. alticola displaying cylindrical trichomes with pointed end D close-up of C. obtusicalyx displaying flat trichomes with blunt tip. Vouchers: A, B from L.C.C. Liebenberg 5789 (PRE) C, D from J.P.H. Acocks 8509 (PRE). SEM images scale bars: 10 mm (A); 50 µm (B); 1 mm (C); 100 µm (D).