| Code | Definition | Number of Accessions |
| 1 | very short < 6 cm - line < 9 cm - population, hybrid | 1 |
| 2 | 6- 9 cm - line 9-12 cm - population, hybrid | 25 |
| 3 | short 10-12 cm - line 13-15 cm - population, hybrid | 164 |
| 4 | 13-15 cm - line 16-18 cm - population, hybrid | 229 |
| 5 | intermediate 16-18 cm - line 19-21 cm - population, hybrid | 190 |
| 6 | 19-21 cm - line 22-24 cm - population, hybrid | 70 |
| 7 | long 22-24 cm - line 25-27 cm - population, hybrid | 23 |
| 8 | 25-27 cm - line 28-30 cm - population, hybrid | 3 |
| 9 | very long >27 cm - line >30 cm | 1 |