FIGURE 3 in Pollen morphology of selected taxa of Valeriana (Caprifoliaceae): taxonomic and evolutionary implications

FIGURE 3. Exine structure of pollen grains of Valeriana (SEM). A. V. montana. B. V. tripteris. C. V. pyrenaica. D, E. V. rossica. F. V. simplicifolia. G–I. V. alliariifolia. A–D, F, G. Columellae in mesocolpia. E, H. Columellae in apocolpia. I. Colpus with halo.