| 1 | Erect tree or shrub: |
| 1' | Wood yellow: |
| 1'' | Stems strongly tuberculate: |
| 1''' | Bark detaching as a parchment-like layer: |
| 1'''' | Bark pale contrasting with blackish petioles: |
| 1''''' | White latex present: |
| 1'''''' | Leaves very finely and closely striate on upper surface: |
| 1''''''' | Leaves whitish tomentellous beneath, large: |
| 1'''''''' | Domatia (pocket or aperturate) or glandular patches in basal and/or main nerve axils, leaves large: |
| 1''''''''' | Petiole rugulose, leaves narrow: |
| 1'''''''''' | Nervation penninerved (base with lowermost nerves sometimes crowded but not clearly 3-nerved): |
