白桦(Betula platyphylla)

白桦(Betula platyphylla)

Scientific Name:Betula platyphylla
English Common Name:
Chinese Common Name:白桦
Synonym:
Flowering:20080714, Mt.Changbai
Family: Betulaceae
Genus:Betula
Description:Trees to 30 m tall; bark grayish white, exfoliating in sheets. Branches not pendulous, dark gray or dark brown, glabrous; branchlets brown, sparsely resinous glandular. Petiole slender, 1-2.5 cm; leaf blade triangular, ovate-triangular, rhombic-triangular, rhombic-ovate, or broadly ovate, 3-9 × 2-7.5 cm, abaxially densely resinous punctate, glabrous, bearded in axils of lateral veins, adaxially sparsely pubescent and resinous glandular when young, base truncate, broadly cuneate, or cuneate and subcordate, margin doubly or simply serrate, or incised-serrate, apex acute, acuminate, or caudate-acuminate; lateral veins 5-7(-9) on each side of midvein. Female inflorescence pendulous, oblong or oblong-cylindric, 2-5 × 0.6-1.4 cm; peduncle slender, 1-2.5 cm; bracts 5-7 mm, densely pubescent and ciliate, 3-lobed, middle lobe triangular-ovate, lateral lobes erect or spreading to recurved, ovate or suborbicular, slightly shorter to longer than middle lobe. Nutlet narrowly oblong, oblong, or ovate, 1.5-2 × 1-1.5 mm, sparsely pubescent, with membranous wings slightly longer than and about as wide as nutlet. Fl. Jun-Jul, fr. Jul-Sep. 2n = 28.(From Flora of China)
Distribution:Temperate broad-leaved forests, shaded, S-facing slopes, ridges, dry, sunny slopes, marshes, forming vast, pure stands or mixed with Acer, Larix, Picea, Tilia, and other species of Betula; 700-4200 m. Gansu, Hebei, Heilongjiang, Henan, Jiangsu, Jilin, Liaoning, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shanxi, SW and W Sichuan, SE Xizang, NW Yunnan [Japan, N Korea, E Mongolia, Russia (Far East, Siberia)]



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