| Code | Definition | Number of Accessions |
| 0 | absent - no nectar glands seen on the undersides of any leaves | 395 |
| 1 | 1 - nectar glands only seen on the main vein of underside of leaves | 4234 |
| 2 | 2 - nectar glands found on main vein and on one of the other veins of underside of leaves | 410 |
| 3 | 3 - nectar glands found on main vein and two other veins on undersides of leaves | 3063 |
| 4 | 4 - nectar glands found on the main vein and three more veins on undersides of the leaves | 2 |
| 6 | reduced - nectar gland is barely noticeable on the main vein | 27 |
| 9 | plot is segregating for this trait and a single score is not an accurate description or the variation is outside of the rating scale | 234 |