| canada | british columbia | alnus incana | species | 3 | 0 |
| canada | quebec | alnus incana subsp. rugosa | subspecies | 1 | 0 |
| finland | | alnus incana | species | 4 | 0 |
| france | | alnus incana | species | 1 | 0 |
| germany | | alnus incana | species | 2 | 0 |
| india | | alnus incana | species | 1 | 0 |
| portugal | | alnus incana | species | 2 | 0 |
| switzerland | | alnus incana | species | 1 | 0 |
| switzerland | geneva region | alnus incana | species | 2 | 0 |
| united kingdom | | alnus incana | species | 1 | 0 |
| united states | | alnus incana subsp. tenuifolia | subspecies | 1 | 0 |
| united states | colorado | alnus incana subsp. tenuifolia | subspecies | 1 | 0 |
| united states | district of columbia | alnus incana subsp. rugosa | subspecies | 3 | 0 |
| united states | massachusetts | alnus incana subsp. rugosa | subspecies | 4 | 0 |
| united states | wisconsin | alnus incana | species | 3 | 0 |