Aghdas Saber - Central Herbarium of Tehran Uuniversity, School of Biology, College of Sciences, University of Tehran.
Farideh Attar - Central Herbarium of Tehran Uuniversity, School of Biology, College of Sciences, University of Tehran.
Seyyedeh Bahereh javadi - Department of Botany, Iranian Research Institute of Plant Protection, P.O. Box ۱۴۵۴, Tehran ۱۹۳۹۵, Iran.

Pollen morphology of ۲۵ species of section Stenocephalae Bunge from genus Cousinia Cass. is described and compared using Light and Scanning Electron Microscope. The pollen grains are prolate, isopolar , tricolporate and exine is densely or loosely verrucate. Based on morphological characters, species of this section can be divided to two groups: ۱. species with narrow cylindrical heads and leathery leaves, ۲. species with ovate heads and herbaceous leaves. The pollen grains of the first group with more than ۲۰ verrucae and the second group with ۳-۳۰ verrucae in each ۲۵ µm² of pollen surface are differentiated from each other. Indeed, these two detached grouping for species of sect. Stenocephalae are somewhat supporting each other.

Cousinia, sect. Stenocephalae, Pollen morphology, Iran