Salix integra

Salix integra is a species of willow native to northeastern China, Japan, Korea and the far southeastern Russia (Primorsky Krai). It is a deciduous shrub growing to 2–6 m tall with greyish-green bark and reddish to yellowish shoots. The leaves are 2–10 cm long and 1–2 cm wide; they are pale green both above and below, and unusually for a willow, are often arranged in opposite pairs or whorls of three, rather than alternate. The flowers are produced in small catkins 1–2.5 cm long in early spring; they are brownish to reddish in colour. It is dioecious, with male and female catkins on separate plants. It is closely related to the European and western Asian Salix purpurea, and has been treated as a variety of it by some authors, as S. purpurea var. multinervis (Franchet & Savatier) Matsumura, or as a subspecies S. purpurea subsp. amplexicaulis (Chaubard) C.K.Schneid....read more on Wikipedia.