近年来,我们在物候观察,形态描述,采集种条、采种育种的过程中,发现了欧洲黑杨、密叶杨、欧洲山杨、合作杨、跃×俄杨雌雄同株,现将其形态特征分述如下。 欧洲黑杨:树冠顶部的花序多为雌花序,雄花序、雌雄同花序极少;树冠中部有雌花序,雄花序、雌雄同花序较多,同花序上部是雄花,下部是雌花,或者相反,也有 In recent years, we observed the phenological observation, morphological description, collection of species, seed breeding process, we found the European Populus, Populus, Populus, Yang, Yue × Russian Populus monoecious, now its morphology The characteristics are described below. Populus euphratica: The top of the canopy is mostly female inflorescences, male inflorescences, rarely monoecious; the middle of the canopy female inflorescences, male inflorescences, monoecious more, the upper part of the inflorescence is male flowers, the lower is the female flowers, or on the contrary, There is also