Salix viminalis
Hybrids with several other willow species are common, notably with "Salix cinerea" ("S. × reichardtii"), "Salix aurita" ("S. × multinervis"), "Salix viminalis" ("S. × smithiana"), and "Salix purpurea" ("S. × sordida"). Populations of "S. caprea" often show hybrid introgression.