Salix blakii is a shrub up to 5 meters high with thin, brownish and bare branches. The leaves are stalked. The leaf blade is linear or linear-lanceolate, 4 to 8 centimeters long and 4 to 5 millimeters wide, long and pointed, with a wedge-shaped base and entire or finely serrated leaf margin. The upper side of the leaf is dull green, the underside greenish, both sides are initially hairy and silky and later glabrous. The lateral pairs of nerves are only indistinctly developed.[1]
Male inflorescences are unknown. The female catkins are 3 to 4 centimeters long and continue to elongate until the fruit is ripe. The inflorescence stalk is 5 to 10 millimeters long and has lanceolate leaves, the inflorescence axis is hairy gray-tomentose. The bracts are brownish, long obovate, glabrous underneath and down-haired at the base and edge. They have three leaf veins and can remain until the fruit is ripe. The female flowers have a conical, gray-tomentose hairy and partly almost bare, short-stalked ovary at the base . The stylus is about the same length as the two-column scar. Salix blakii flowers when the leaves shoot in April, the fruits ripen in May.[1]
