Betula cylindrostachya

Betula cylindrostachya is in the birch or Betulaceae family and is native to the warm, temperate broad-leaved forests of China (provinces of Sichuan, SE Xizang, NW Yunnan), India, Myanmar and Nepal. It can reach a height of 30 m tall.

• Leaves are alternate, simple, ovate to elliptic or oblong, 5–14 cm long and 2–8 cm broad, irregularly double-toothed, pointed, densely pubescent when young, tufts of hair in the vein axils, 13–14 pairs of lateral veins with corrugated appearance; petiole is 0.8–1.5 cm long.
• The species is monoecious; flowers are pollen catkins (staminate) to 14 cm long and seed catkins up to 10 cm long, narrow and cylindrical, drooping downward, in pairs, flowering in April-May; fruit is a tiny, pubescent samara with membranous wings, fruiting in July-August in China.
• Mature bark is brown or grayish black; branchlets are yellowish brown with dense, yellow pubescence.