Calyx and corolla morphology. Calyces in Coleus with pedicel attached excentrically above midline of calyx: 1 C. betonicifolius 2 C. platyphyllus showing the rounded lateral calyx lobe in some species of the formally recognized Solenostemon. Calyx in Equilabium with pedicel attached ± at centre of calyx base with the lateral lobe held midway between the anterior and posterior lobes: 3 E. megafolium 4 E. masukensis. Calyces in Plectranthus with pedicel attached ± at centre of calyx base with the lateral lobe closer to the anterior than the posterior lobes: 5 P. alboviolaceus. Corolla shape in Coleus showing unequal anterior and posterior corolla lips: 6 C. schizophyllus 7 C. hockii. Corolla shape of Equilabium showing equal anterior and posterior corolla lips: 8 P. parvus 10 P. laxiflorus. Corolla shape of Plectranthus showing equal anterior and posterior corolla lips and gibbous-based corolla: 9 P. strangulatus;. Drawn by Emmanuel Papadopoulos. Reproduced from Flora of Tropical East Africa (Paton et al. 2009).