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This study involves the description and comparison of the ultrastructure of pollen in the cleistogamous and chasmogamous flowers of Viola sp. It shows that the divergences become more important at the end of the ontogeny.In the mature pollen grains of cleistogamous flowers, the starch in the plastids is always abundant and the pulverization of dictyosomes into microvesicles is not very important. At maturity, the pollen grains of chasmogamous flowers show leucoplastids and numerous microvesicles of Golgi apparatus.

Etude Comparée de L'Evolution des Grains de Pollen dans les Fleurs Cléistogames et les Fleurs Chasmogames de <i>Viola sp.</i> (Violacees)