| 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 |
| Code | Term | Description |
|---|---|---|
| 1 | Green | |
| 2 | Green with purple near stem | |
| 3 | Green with purple near leaf | |
| 4 | Green with purple at both ends | |
| 5 | Green with purple spots throughout the petiole | |
| 6 | Green with purple stripes | |
| 7 | Purple with green near leaf | |
| 8 | Some petioles purple, others green | |
| 9 | Totally or mostly purple |