| Code | Definition | Number of Accessions |
| 1 | 1 = non swollen tap root | 16 |
| 2 | 2 = longitudinal section is triangular | 173 |
| 3 | 3 = longitudinal section is cylindric | 12 |
| 4 | 4 = longitudinal section is elliptic | 51 |
| 5 | 5 = longitudinal section is spheric | 91 |
| 6 | 6 = longitudinal section is transverse elliptic | 1 |
| 7 | 7 = longitudinal section is inverse-triangular | 1 |
| 9 | 9 = longitudinal section is horn-shaped | 4 |