| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Populus | tremuloides | 3782 |
| 2 | Populus | deltoides | 2221 |
| 3 | Populus | fremontii | 1489 |
| 4 | Populus | grandidentata | 778 |
| 5 | Populus | trichocarpa | 649 |
| 6 | Populus | alba | 503 |
| 7 | Populus | balsamifera | 470 |
| 8 | Populus | nigra | 254 |
| 9 | Populus | tremula | 143 |
| 10 | Populus | angustifolia | 62 |
| 11 | Populus | canescens | 50 |
| 12 | Populus | canadensis | 31 |
| 13 | Populus | heterophylla | 29 |
| 14 | Populus | brandegeei | 13 |
| 15 | Populus | mexicana | 11 |
| 16 | Populus | jackii | 7 |
| 17 | Populus | euphratica | 6 |
| 18 | Populus | yunnanensis | 4 |
| 19 | Populus | x | 3 |
| 20 | Populus | maximowiczii | 2 |
| 21 | Populus | afghanica | 2 |
| 22 | Populus | acuminata | 2 |
| 23 | Populus | dimorpha | 1 |
| 24 | Populus | monticola | 1 |
| 25 | Populus | ciliata | 1 |
| 26 | Populus | heimburgeri | 1 |
| 27 | Populus | smithii | 1 |