Salix boothii is a shrub which can reach 6 metres (20 ft) in height. It is larger and has more branches in well-drained soils, and takes a smaller, simpler form in saturated areas such as bogs. The leaves are lance-shaped to oval with a pointed tip and smooth-edged or lightly serrated. They are up to 10 cm long when mature with a shiny top surface; new leaves are covered in shaggy white hairs. 
The inflorescences develop before the leaves grow, or simultaneously. Male catkins are up to about 4 cm long and female catkins are up to 7 cm. Male flowers have two stamens each. Its bloom period is May and June. 
This willow forms dense colonial thickets and it can be used for erosion control in riparian zone habitats in its native range. It is also tolerant of wildfire, resprouting relatively easily after aboveground parts have been burned away.
- USDA Plants Profile for Salix boothii (Booth's willow)
- Jepson Manual eFlora (TJM2) treatment of Salix boothii
- Flora of North America
- UC Photos gallery
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