LM photographs of transverse sections of petiole and mid-veins of Curarea: A petiole mid-section of C. tecunarum, note the vascular bundles surrounded by sclerotic fibres on the outer part (arrow) B adaxially concave, abaxially strongly raised, rounded and tomentose mid-vein, C. tecunarum (A, B from Ortiz et al. 143); C adaxially flat, abaxially strongly raised, triangular and glabrescent mid-vein, C. toxicofera (van der Werff & Vásquez 13990). Scale bar: 0.6 mm (A, C), 1 mm (B).