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| Genotype class | Number |
| P. balsamifera (B) | 65 |
| P. deltoides (D) | 84 |
| P. deltoides x P. balsamifera (F1) | 411,2 |
| BCx 3 (F1 x B) | 54 |
| BCx (F1 x D) | 34 |
| Total | 205 |
1 Three of these F1 hybrids have P. balsamifera as the maternal parent.
2 Two of the F1 hybrids have unknown maternal and paternal genotypes.
3 BCx = Backcross to a pure species.
4 Maternal and paternal genotypes are unknown.
