树干和分枝通常没有不定的菜芽；鳞脐平的或钝尖。
Trunk and branches usually without adventitious sprouts; umbo flat or blunt.
为了探讨悬铃木冬芽休眠的机理，研究了悬铃木冬芽休眠过程中芽鳞及叶原基的内源激素变化与休眠的关系。
The relationship between dormancy and endogenous hormone inside buds scales and leaf primordium was studied in order to explore the mechanism of winter buds' dormancy in Platanus acerifolia.
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