Abaxial leaf vein pigmentation
| Code | Term | Description |
|---|---|---|
| 1 | Yellow | |
| 2 | Green | |
| 3 | Purple spot in the base of main rib | |
| 4 | Purple spots in several veins | |
| 5 | Main rib partially purple | |
| 6 | Main rib mostly or totally purple | |
| 7 | All veins partially purple | |
| 8 | All veins mostly or totally purple | |
| 9 | Lower surface and veins totally purple |