一、开花结实的观察一九七○年三月开始,对池杉的开花结实习性进行了观察记载,了解到池杉是雌雄同株而异花的,三至四年生实生苗开始出现了少数雌花,五至六龄雌花增多,并开始出现雄花,但数量不多(个别植株在三龄时出现雄花),大部分植株的雄花枝很少。十龄以后雄花增多,十七至十八龄雄花更多。杭州地区池杉的花芽分化期在七至八月 First, the flowering and sturdy observation began in March 1970, on the flowering and fruiting habits of Ipomoea cynocephala was observed and learned that Ictero is a monoecious and cross-flowered, three to four-year-old seedlings began to appear a minority Female flowers, five to six female flowers increased, and began to appear male flowers, but a small number (individual plants appear male flowers in the third instar), the majority of male plantlets few flowers. After ten years of male flowers increased, seventeen to eighteen male flowers more. Hangzhou area Ipomoea flower bud differentiation period from July to August