前言龙眼(Dimocarpus longana Lour.)是我国南方名贵特产,为重要的亚热带果树之一。龙眼花穗“冲梢”为群众俗称。是指发育中的龙眼花序,因受内外条件变化的影响,长出枝叶,使花序发育终止。“冲梢”发生越早,基部已分化的花蕾萎缩脱落越多,成穗越差,甚至完全发育为营养枝;“冲梢”发生越迟,则反之。龙眼花穗“冲梢”有两种类型:一种是叶包花,即一个花 Introduction Longan (Dimocarpus longana Lour.) Is China’s southern specialty, is one of the important subtropical fruit trees. Longan flower spike “commonly known as the masses. Refers to the development of the longan, due to changes in internal and external conditions, the growth of branches and leaves, inflorescence development termination. The earlier the ”shoot tip“ occurs, the more buds have differentiated, the more the buds shrink and fall off, the poorer the ear becomes and even fully develop into vegetative shoots. The later the ”shoot tip“ occurs, the other way around. Longan flower spike ”There are two types: one is the leaf package flower, that is, a flower