Pollen morphology of 10 species of the subgenus Phelipanche (genus Orobanche L.) was studied using light and scanning electron microscopy. Pollen grains of the studied species are 3-colpate, rarely 2-colpate, 3-colporate, and inaperturate; prolate, spheroidal and oblate-spheroidal, medium-sized. Six types of sculpture are identified: retipilate, retipilate-scabrate, granulate, granulate-foveolate, scabrate-verrucate, and verrucate. The palynomorphological data were analyzed on the background of the system of Orobanche (according to Tzvelev, 1981) and current molecular phylogenetic data. The type of aperture, pattern of exine surface, shape, size, exine thickness, and colpi structure are the most important species features. Peculiarities of pollen grains confirm the placement of the studied species in the subgenus Phelipanche, but the taxonomic status of some species or subspecies remains problematic.

Keywords: pollen grains, morphology, sculpture, taxonomy, Phelipanche, Orobanche, Orobanchaceae

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