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- Maggi, Filippo; Kolarčik, Vladislav; Mártonfi, Pavol
- Biologia 2008 v.63 no.2 pp. 183-186
- Onosma echioides; chromosome number; exine; grains; palynology; pollen; scanning electron microscopy; Italy; Slovakia
- ... Pollen size and exine structure of the following five Onosma L. species from Slovakia and Italy were studied by light and scanning electron microscopy: Onosma echioides, O. tornensis, O. visianii, O. arenaria, and O. pseudoarenaria. Among the taxa studied, O. echioides has the smallest pollen grains in average (10.5–17.5 × 8.0–14.5 µm), and O. pseudoarenaria the largest grains in average (15.3–20. ...