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一年生蔓性草本,蔓长2.5米以上。第一对真叶心脏形,单叶对生。第3片真叶以后为3片小叶组成的复叶,互生。花紫红色,第5～7叶
Annual Mandolin herb, vine length 2.5 meters or more. The first true leaf heart-shaped, single leaf opposite. The third true leaves after the three leaflets composed of compound leaves, alternate. Flowers purple, the first 5 to 7 leaves