Salix | Salix viminalis | Salix caprea | Salix cinerea | Salix arctica | Salix purpurea | Salix atrocinerea | Salix acutifolia | Salix alba | Salix alaxensis | Salix, Pennsylvania | Salix matsudana | ''Salix fragilis'' in native riparian zone | Salix babylonica |
Pollution and reduction of rivers are threatening specific plants and animals including Fremont cottonwood (Populus fremontii) and Goodding's willow (Salix gooddingii), the threatened Gila trout (Oncorhynchus gilae), the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus).