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Pollen morphology andthe relationship of the Plumbaginaceae, Polygonaceae and Primulaceae to the order Centrospermae.Smithson.Contrib. NowickeJW,SkvarlaJJ. The Botanical Journal . 1977
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Evolution of exine Structure in thepollen of primitive angiosperms. Walker J W. American Journal of Botany . 1974
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Astudy on thepollen morphology ofthe genus Polygonumin China. Wang Jianxin,Feng Zhijian. Acta Phytotaxonomica Sinica . 1994