20. Salix pentandra Linnaeus, Sp. Pl. 2: 1016. 1753.
五蕊柳 wu rui liu
Shrubs or trees to 5 m tall; bark gray or grayish brown. Juvenile branchlets brownish green, grayish green, or grayish brown, glabrous, shiny. Stipules when present oblong or broadly ovate, deciduous, sometimes absent; petiole 2-14 mm, apex glandular; leaf blade broadly lanceolate, ovate-oblong, or elliptic-lanceolate, 3-13 × 2-4 cm, leathery, viscid when young, abaxially greenish, pruinose or glabrous, adaxially dull green, shiny, base obtuse or cuneate, margin glandular serrate, apex acuminate. Male catkin 2-4(-7) × 1-1.2 cm; bracts green, lanceolate, oblong, elliptic, deltoid-obovate, or obovate-oblong, ca. 2.5 mm, 2- or 3-veined, margin glandular dentate or entire, apex rounded or obtuse. Male flower: glands cylindric, ca. 1 mm, adaxial gland usually 2- or 3-lobed; stamens (5 or)6-9(-12); filaments ca. 4.5 mm, unequal, villous at base. Female catkin 2-6 cm × ca. 8 mm. Female flower: adaxial gland 1, rarely 2, 1- or 2-parted, narrowly ovate or ovate, apex truncate, abaxial gland sometimes absent; ovary ovoid-conical, glabrous, subsessile; style and stigma conspicuous, 2-parted. Capsule ca. 9 mm, shiny, shortly stipitate. Fl. Jun, fr. Aug-Sep. 2n = 76.
Margins of woods near rivers, marshes and meadows within forests, valleys; 500-1700 m. Hebei, Heilongjiang, Jilin, Liaoning, E Nei Mongol, Xinjiang [Mongolia, Russia; Europe].