''Salix humilis'', known as prairie willow, is a species of

willow Willows, also called sallows and osiers, from the genus ''Salix'', comprise around 400 speciesMabberley, D.J. 1997. The Plant Book, Cambridge University Press #2: Cambridge. of typically deciduous trees and shrubs, found primarily on moist ...

native to the United States and Canada, east of the Rockies. It is a shrub, 2–12 feet tall, which often forms thickets. The stems are yellowish to brown. The gray-green to blue-green foliage has insignificant fall color. Male and female flowers are found on separate plants. The green silky catkins appear before the leaves emerge in spring.

References

humilis Flora of Northern America {{Salicaceae-stub