| 1 | Leaf blade thickly coriaceous, densely hirsute beneath, venation slightly impressed |
| 1' | Leaf blade coriaceous or chartaceous, glabrous or with few stiff appressed hairs only beneath, venation plane |
| 2 | Leaf blade narrowly oblong to oblong-lanceolate (length breadth ratio greater than 2.5); disk lobes small and flattened; style undivided |
| 2' | Leaf blade ovate-elliptic to oblong (length breadth ratio less that 2.2); disk lobes large and swollen; style 3-fid |
