Culm: diameter at basal internode
Measured as the outer diameter of basal portion of the main culm. Cultivated species: record average of three representative plants during flowering or at late reproductive stage. Wild species: record average of five plants at late reproductive stage. Alternatively, cultivated species can be coded as follows:
| Code | Term | Description |
|---|---|---|
| 1 | Thin | <5 mm |
| 2 | Thick | ≥5 mm |