花是被子植物繁衍后代所特有的繁殖器官,由于花的各部分不易受外界环境的影响,其形态特征较稳定,变异较小,因此长期以来,人们都以花的形态结构作为被子植物分类鉴定和系统演化的主要依据。关于花的本质,目前普遍认为是枝性起源,即花像是一个变态的枝条,它的节间极度缩短,顶 Flowers are the reproductive organs unique to the offspring of angiosperms. Since the floral parts are not easily affected by the external environment, their morphological characteristics are relatively stable and their variation is relatively small. Therefore, flowers have long been classified as angiosperms by the morphological structure of flowers And the main basis for system evolution. On the nature of flowers, now generally considered to be a branch of origin, that flower is like a perverted branches, its extremely short internodes, top