Pollen sample of 20 species of Verbascum L. grown in the north and central areas of Iraq, were collected between April 2012 and May 2013 (Table 1). The voucher specimens have been deposited in the herbarium of College of Education, Ibn Al-Haitham, University of Baghdad, Iraq.
The pollen was prepared using the acetolysis method as described by Erdtman (1960).
The measurements and observations were carried out using both Light microscope (LM) and Scanning Electron microscope (SEM). For LM analysis, the acetolysed pollens were placed in a small vial,and 5-7 drops of silicone oil were added, and then the samples were mounted on a glass slide sealed with paraffin and observed under light microscope.