| Code | Definition | Number of Accessions |
| 0 | none - base of petal is same color as rest of petal. | 3570 |
| 1 | light - red coloration is faint | 375 |
| 2 | medium - red coloration is just enough to create effect of petal spot. | 1097 |
| 3 | heavy - red coloration creates solid band across petals and extends halfway up the petal. | 2038 |
| 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 | 150 |