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24b. Populus purdomii var. rockii (Rehder) C. F. Fang & H. L. Yang, Fl. Reipubl. Popularis Sin. 20(2): 34. 1984.
光皮冬瓜杨 guang pi dong gua yang
Populus szechuanica C. K. Schneider var. rockii Rehder in Rehder & Kobuski, J. Arnold Arbor. 13: 386. 1932.
Bark smooth, not exfoliating. Petiole and leaf blade abaxially ± pubescent along veins.
* Mountains; 1000-1800 m. SE Gansu
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