Section Dissimiles C.B. Clarke is reviewed. Eleven species are known, one of which is newly described here (C. fulvisericea), and one species is reduced to synonymy (C. producta = C. trisepala). The section is centred on Borneo, with two outlying species in Sumatra and one in Peninsular Malaysia. Section Dissimiles is defined by a unique combination of characters, the most distinctive of these are: a zygomorphic calyx (the upper three lobes are fused to form one but the tips remain free, and the lower two lobes are completely separated to the base); anisophyllous leaf pairs, and a small (generally less than 2 cm long), predominantly white, somewhat translucent corolla.