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7a. Populus rotundifolia var. duclouxiana (Dode) Gombocz, Math. Termesz. Kozl. 30: 130. 1908.
清溪杨 qing xi yang
Populus duclouxiana Dode, Bull. Soc. Nat. Hist. Autun. 18: 190. 1905.
Female flower: style short or subsessile; stigma 2-parted, each part diverging.
* Mountain slopes; circa 2800 m. Gansu, Guizhou, Shaanxi, Sichuan, Xizang, Yunnan
This variety differs from var. rotundifolia (which occurs in Bhutan) as follows: leaves deltoid-orbicular, larger, apex shortly acuminate or obtuse; female catkin usually more than 10 cm.
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