Abstract
AbstractPollen morphology of nine species belonging to four genera: Cephalaria, Pterocephalus, Scabiosa, and Lomelosia of Dipsacaceae in Egypt has been investigated by light microscope (LM) and scanning electron microscopy (SEM). Pollen shape, size, exine ornamentation, number and characters of apertures present powerful characters for distinguishing between species. The pollen grains were tricolpate and triporate. Their shapes vary from spheroidal to oblate‐spheroidal. Regarding the position of apertures, three types can be recognized viz., circumaperturate, angulaperturate, and planaperturate. Concerning sculpturing of the exine in proximal face, two different pollen types can be distinguished viz., spinulate and gemmate types. The exine ornamentation was found useful to distinguish between closely related genera such as Scabiosa and Lomelosia. A diagnostic key is given for all studied taxa based on palynomorphological characters (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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