Tragopogon L. (Cichorioideae, Lactuceae, Scorzonerinae) is an Old World genus with 150 species. Pollen morphology has proved useful in the systematics of some genera and species Asteraceae as well that its The pollen 24 taxa was investigated detail by scanning electron microscopy (SEM). grain type ranged from suboblate, oblate-spheroidal to prolate-spheroidal equatorial view hexagonal, obtuse-h...

Plant pollens are microscopic particles exhibiting a remarkable breadth of complex solid surface features. In addition, many pollen grains are coated with a viscous liquid, "pollenkitt", thought to play important roles in pollen dispersion and adhesion. However, there exist no quantitative studies of the effects of solid surface features or pollenkitt on adhesion of pollen grains, and it remain...