1	Leaf blade peltate, apex rounded, margin entire	C. vietnamensis
–	Leaf blade not peltate, apex acuminate, margin minutely dentate	2
2	Calyx lobes 7–15 mm wide, corolla tube white ventrally	C. banksiae
–	Calyx lobes 0.9–4.2 mm wide, corolla tube purple ventrally	C. smitinandii