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木兰科的木兰属、木莲属和含笑属的果实类型是什么?请依据这三个属的代表树种紫玉兰、木莲、含笑的形态区别,完成下列分种检索表。 ( 8 分) 1 .花顶生,雌蕊群无柄或几无柄 2 .常绿乔木,每心皮具4个以上胚珠,聚合果近球形.............................. 2 .落叶灌木,每心皮具2个胚珠,聚合果圆柱形.................................... 1 .花腋生,雌蕊群具显著的柄...............................................................
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