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(四) 东亚(中国、日本)区的杨树东亚区范围较大,北起苏联东部地区,南至印度,西自东经80°左右,东到日本。其分布特点是:杨树种类最多、派组最全的一个区,尤其是青杨派的种类是其它三个分布区无法相比的,大大超过北美两个分布区的杨树种类总和。东亚区杨树近年来研究较深,种的分类较细,但由于植物分类学者见解不同,详细分类有待进一步研究。Ⅰ、胡杨派胡杨派有2种,东亚区均有分布,除胡杨外,还有: 26、灰胡杨 Populus Pruinosa Schrenk.分布中国新疆、苏联南部、伊朗。
(IV) East Asia (China, Japan) Poplar The East Asia region is large in scope, starting from the eastern part of the Soviet Union to the north, to India from the south, from east longitude about 80 ° and east to Japan. The distribution is characterized by the most poplar species and the most complete district of a school. In particular, the species of the Qingyang School can not be compared with the other three distribution areas, greatly exceeding the sum of the poplar species in the two distribution areas in North America. In recent years, the research on poplar in East Asia area has been deeply studied and the classification of the species is rather fine. However, due to the different opinions of plant taxonomists, the detailed classification needs further study. I. Populus euphratica There are two species of Populus euphratica distributed in East Asia, in addition to Populus euphratica, there are: Populus Pruinosa Schrenk 26. Populus Pruinosa Schrenk distributed in China’s Xinjiang, southern Soviet Union, Iran.