Source: Valdés, B. & Raab-Straube, E. von (2011+): Boraginaceae. – In: Euro+Med Plantbase - the information resource for Euro-Mediterranean plant diversity.
Euro+Medendemic: Caucasia (Ab + Ar + Gg + Rf(CS))nativeA; CrimeanativeB,C,D,E; GreecenativeF; MoldovanativeB; Turkey (Turkey, Asiatic partnativeC,G); Ukraine, with CrimeanativeB,D,H
Bibliography
A.Komarov, V. L. 1953: Fl. URSS 19
B.Fedorov, A. A. 1981: Flora partis europaeae URSS 5. – Leningrad
C.Greuter, W., Burdet, H. M. & Long, G. 1984: Med-Checklist 1. – Genève & Berlin
D.Prokudin, J. N. 1987: Opredelitel’ vysših rastenij Ukrainy. – Kiev: Naukova Dumka
E.Tutin, T. G., Heywood, V. H., Burges, N. A., Valentine, D. H., Walters, S. M. & Webb, D. A. 1964–1980: Flora europaea 1-5. – Cambridge: Cambridge University Press
F.Teppner, H. 1991: Karyology of some Greek Onosma species (Boraginaceae). – Bot. Chron. 10: 271-292
G.Güner, A. 2012: Türkiye Bitkileri Listesi. – Istanbul
H.Mosyakin, S. L. & Fedoronchuk, M. M. 1999: Vascular plants of Ukraine. A nomenclatural checklist. – Kiev: M. G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine