| 1 | Flowers in capitula |
| 1' | Flowers in umbellules. |
| 2 | Umbellules arranged racemosely along the principal rays. |
| 2' | Umbellules in a short corymbose compound umbel |
| 3 | Leaf margins crenate. |
| 3' | Leaf margins entire (rarely with few minute dentations). |
| 4 | Leaflets oblong (Luzon) |
| 4' | Leaflets lanceolate (New Guinea) |
| 5 | Leaflets ovate (Sabah, Palawan) |
| 5' | Leaflets elliptic (New Guinea) |
