| 1 | Inflorescence terminal, the lowermost branches in the axils of leaf-like bracts. |
| 1' | Inflorescence axillary or supra-axillary. |
| 2 | Leaves ovate, broadest near base; flowers 5-merous. |
| 2' | Leaves obovate-elliptic, broadest above middle; flowers 4-merous. |
| 3 | Inflorescence racemose; flowers sessile or shortly pedicellate |
| 3' | Inflorescence paniculate; flowers distinctly pedicellate |
