Color of mature leaf petiole
| Code | Term | Description |
|---|---|---|
| 1 | All green with purple base | |
| 2 | All green with purple leaf gasket | |
| 3 | All green, purple at both ends | |
| 4 | All purple green with purple base | |
| 5 | All green purple with purple leaf gasket | |
| 6 | All purple green, both tips purple | |
| 7 | Green | |
| 8 | Purple | |
| 9 | Green brown | |
| 10 | Brown | |
| 11 | Dark brown | |
| 12 | Other (specify) |