Study of Palynological traits for some species of the genus Onobrychis Mill

Onobrychis is a legume, and it contains blooms. Their distribution spans the entire world. A total of eleven O. were investigated for their pollen size and characteristics as part of this research project. A light microscope and a scanning electron microscope were used to analyze specimens originating from Northern Iraq. After conducting research, all types of O. possessed the type of germination aperture, prolate, sub-prolate and prolate shapes, and reticulate perforate orientation. Characterization is performed on the O. acaulis and O. galegiofolia, which are prolate in shape. At the same time, O. susiana is subprolate. In contrast, other species, such as O. schhuensis, O. ptolemaica, O. hausskni, O. megataphrois, O. caputigalli, O. aequidentata, O. haespindicala, and O. galegioides, are prolate. Additionally, tricolpate pollen was observed in each plant species. The larger pollen grain in size is O. Susiana (1.16µm), and the smaller is O. hausskni (0.34 µm).