Abstract
The paper comprise comparative polynological study of species of four genera belong to the tribe Heliantheae (i.e. Bidens L. , Eclipta (L.) Hassk. , Helianthus L. and Xanthium L.) in Iraq. Pollen grains were found to be Tricolporate but Bicolporate and Tetracolporate were Presented also. It was found the external features of the pollen wall of great taxonomic value.
The article was added to IASJ on 2012-06-24
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