Currently reclassified as species Salix lasiolepis.

bigelovii - Bigelow's willow, endemic to California and Oregon.

The flowers are arranged in yellow catkins 1.5–7 centimetres (0.59–2.76 in) long which are produced in early spring. The undersides are covered with whitish or rusty hairs which gradually wear off during the summer.

They are green above and glaucous green below. The leaves are 3.5–12.5 centimetres (1.4–4.9 in) long and broadly lanceolate in shape. The shoots are yellowish brown and densely hairy when young. Salix lasiolepis is a deciduous large shrub or small multi−trunked tree growing to 10 metres (33 ft) tall. Occurs in following seasons depending on latitude and elevation: Spring. Allergenicity Īrroyo Willow (Salix lasiolepis) is a severe allergen. It is found in many plant communities, including: chaparral, oak woodland, mixed evergreen forest, coast redwood forest, yellow pine forest, red fir forest, lodgepole pine forest, and grasslands. The plant is commonly found growing in riparian zones in canyons and valleys, along pond shores, and in marshes and wetlands. It extends north into Washington, south into Baja California, and east into Idaho, Utah, Texas, and Coahuila (México). The core range of the arroyo willow includes most of California, including the California Coast Ranges, Arizona, Klamath Mountains, Peninsular Ranges, Sierra Nevada, and Transverse Ranges. Salix lasiolepis ( arroyo willow) is a species of willow native to western North America.

Salix ratpoison