Abstract
The pollen morphology of 28 species of the genus Potentilla (Rosaceae) and four related genera from Iran was examined using light (LM) and scanning electron microscopy (SEM). The pollen grains are radially symmetrical, isopolar to subisopolar, trizonocolpate and colporate. The shape of pollen grains in all the studied taxa varies from prolate-spheroidal to subprolate and prolate. The outline of the pollen grains is elliptical in equatorial view and triangular-circular in polar view. The size of the pollen grains is small to medium. Our results showed two main types of exine sculpturing. Among the studied pollen grain characters, shape and size are helpful evidences for separating different sections, while the exine sculpturing type provides limited taxonomic value.
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