| 1 | Leaves over 2 cm long; foliage bud at least 1.5 mm long. |
| 1' | Leaves less than 2 cm long (less than 6 mm wide, always blunt, crowded); foliage bud less than 1.5 mm long (fruit crested) |
| 2 | Leaves less than 8 mm wide, not always blunt (sun growth leaves acute). |
| 2' | Leaves more than 8 mm wide, always blunt (dispersed; fruit not crested) |
| 3 | Leaves dispersed. Fruit not crested |
| 3' | Leaves crowded (overlapping). Fruit crested |
