落叶果树绝大多数的种、变种以及品种在早春开花前,花粉母细胞才进行减数分裂形成花粉粒。然而山桃(Prunus davidiana)这个种很特殊,在秋末叶片变黄即将脱落时,就已经形成花粉粒了,并且以花粉粒形式越冬。而且,冬季12月初山桃枝条室内插瓶即可开花。核果类果树中另一个种甘肃桃(Prunus kansuensis)也有此特性,但其花粉粒 Deciduous fruit trees Most species, varieties and varieties before flowering in early spring, pollen mother cells were meiosis to form pollen grains. However, this species of Prunus davidiana is very special. When leaves turn yellow and fall off in the late autumn, pollen grains have already formed and winters are pollen grains. Moreover, in early December winter peach shoots branches bottle can flowering. Prunus kansuensis, another species of drupe, also has this trait, but its pollen grains