Belyachenko Yuliya А. RussiaSaratovSaratov State University , 83, Astrakhanskaya str., Saratov, 410012, Russia juliabelyachenko@mail.ru Author's articles Pollen Grain Size Polymorphism in Late Tulip (Tulipa gesneriana L., 1753) Cenopopulations within the Territory of “Ivanovo Field” Natural Boundary