In Verbascum, pollen grains vary in shape, size and exine thickness. The shape can be prolate spheroidal, subprolate, prolate and oblate-spheroidal. The pollens are small to medium-sized. Most of the species have medium-sized pollens (25.0-32.5 μm) except in V. agrimoniifolium and V.oreophilum, where small-sized pollens (16.5-24.0 μm) are observed. Verbascum palmyrense, V.sinuatum, V. songaricum, and V. thapsus have both small and medium sized pollen grains. The polar axis (P) ranged from 16.5-32.5 μm. The largest polar axis was recorded in V. alceoides, V.assurense and V. laetum with 32.5 μm long and the smallest was found in V. agrimoniifolium with 16.5 μm long. The equatorial diameter (E) ranged from 15.5-27.5 μm and the largest one was present in V. assurense with 27.5 μm, while the smallest was found in V. agrimoniifolium. In addition, the exine thickness of the pollen of species studied ranged from 0.87 to 4.75 μm.