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华北地区莴苣属(广义)植物花粉特征的研究
李庆文; 尹祖棠;   
1.北京市教育局教材编审部;2.北京师范大学生物系
摘要:
本文研究了华北地区莴苣属(广义)7种植物的花粉形态与微形态特征。结果表明:莴苣属(广义)内这些种具有相同的花粉类型。该属的花粉为球形,3孔沟;极面观为三裂圆形,近六边形;赤道面观为圆形;花粉表面具网状纹饰,同胞15个,网脊上有许多小穴和规则排列的刺。与邻近属形成明显差异,使该属成为一个自然类群。新属毛鳞菊属ChaetoserisShihgen.nov.以其花粉网状纹饰的网脊上具不规则排列的短柱而有别于莴苣属(广义)。花粉的形态特征与微形态特征可为菊科属级水平分类提供重要依据。
关键词:  莴苣属(广义)  花粉  形态特征  微形态特征  分类  
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