Less than 5cm high, forming dense cushion-like mats from a central tap root. Leaves oblong or oval, 3-10 X 2-5mm, acute or obtuse, light green, glabrous with marked venation. Some dead leaves persist on the branches into the next season. Catkins small and few flowered, the female frequently having only two flowers, ovary purplish glabrous, scales very small with a fringe of hairs. Western U.S.A.; Rocky Mountains from Montana to Wyoming (Yellowstone and Grand Teton Parks) on summits at 2700-3500m. A very small and desirable willow not at present in general cultivation.