A Pacific willow (Salix lasiandra) is a fast-growing native North American shrub or small tree, known for its shiny, lance-shaped leaves and bright yellow twigs in winter, thriving in wet areas like streambanks where it's crucial for erosion control and wildlife habitat. It's a key riparian species, providing early food for pollinators and browse for animals like deer and beaver, with its bark historically used for medicine (like aspirin's precursor) and basketry.