Vasilis Teodoridis:
Salicaceae | Populus
3. Populus davidiana Dode; Bull. Soc. Hist. Nat. Autun. 18: 189. 1905.
?? shan yang
Trees to 25 m tall; suckering freely; trunk to 60 cm d.b.h.; bark grayish green or grayish white; smooth; but rough on basal part of old trunk; crown globose. Branchlets reddish brown; terete; sprouts pubescent. Buds ovoid or ovoid-globose; glabrous; slightly viscid. Petiole laterally flattened; leaf blade deltoid-ovate-orbicular or suborbicular; 3-6 cm; larger and deltoid-ovate-orbicular on sprouts; reddish when very young; abaxially pilose; base rounded; truncate; or shallowly cordate; margin with dense; sinuolate teeth; apex acute or shortly acuminate. Male catkin 5-9 cm. Male flower: stamens 5-12. Female catkin 4-7 cm; ca. 12 cm in fruit. Female flower: ovary conical; stigma red; 2-parted. Capsule ovoid-conical; ca. 5 mm; 2-valved; shortly stipitate. Fl. Mar-Apr; fr. Apr-May. 2n = 38*; 44.
Mountains; 100-3800 m. Anhui; Gansu; Guangxi; Guizhou; Hebei; Heilongjiang; Henan; Hubei; Hunan; Jiangxi; Jilin; Liaoning; Nei Mongol; Ningxia; Qinghai; Shaanxi; Shanxi; Sichuan; Xizang; Yunnan [Korea; Mongolia; E Russia].
3a. Populus davidiana var. davidiana
?? (???) shan yang (yuan bian zhong)
Populus davidiana f. ovata C. Wang & S. L. Tung; P. davidiana f. pendula (Skvortzov) C. Wang & Tung; P. davidiana var. pendula Skvortzov; P. tremula Linnaeus var. davidiana (Dode) C. K. Schneider; P. wutanica Mayr.
Branchlets; petioles; and leaf blades smooth.
Mountains; 100-3800 m. Anhui; Gansu; Guangxi; Guizhou; Hebei; Heilongjiang; Henan; Hubei; Hunan; Jiangxi; Jilin; Liaoning; Nei Mongol; Ningxia; Qinghai; Shaanxi; Shanxi; Sichuan; Xizang; Yunnan [Korea; Mongolia; E Russia