1	Leaf aspect ratio less than 2.5	2
–	Leaf aspect ratio more than 2.5	3
2	Basal lateral veins attaining to 1/3 to 1/2 of leaf blade; tertiary veins reticulate; fruits globose	C. densiflora
–	Basal lateral veins attaining less than 1/4 of leaf blade; tertiary veins scalariform; fruits ovoid	C. kaengkrachanensis
3	Leaves (dried) distinctly glaucous below	4
–	Leaves (dried) not or only slightly glaucous below	5
4	Leaves lustrous above when fresh, distinctly foveolate above when dried	C. albiramea
–	Leaves not lustrous above when fresh, not foveolate above when dried	C. kurzii
5	Tertiary veins mostly reticulate	6
–	Tertiary veins scalariform	7
6	Leaves (thinly) leathery; lamina oblong, oblong-lanceolate, (5.5–)10–19 × (2.6–) 3–4.6 cm; petiole 0.8–1.5 cm long	C. chanthaburiensis
–	Leaves papery; lamina elliptic to elliptic-oblong, (3–)5–10(–13) × (1.5–)2–3(–6) cm; petiole 0.4–0.8(–1) cm long	C. concinna
7	Inflorescences longer than leaves; fruits ellipsoid	8
–	Inflorescences shorter than leaves; fruits globose or unknown (for C. pustulata)	9
8	Leaves lustrous above when fresh; fruit stalks thickly swollen	C. scortechinii
–	Leaves not lustrous above; fruit stalks not or slightly swollen	C. amygdalina
9	Leaves waxy below, light brown when dried	C. pallens
–	Leaves not waxy below, dark brown when dried	10
10	Finely reticulate veins raised on the upper surface of dried leaves	C. pustulata
–	Finely reticulate veins visible but not raised above	C. sublanuginosa