Source: Valdés, B. & Raab-Straube, E. von (2011+): Boraginaceae. – In: Euro+Med Plantbase - the information resource for Euro-Mediterranean plant diversity.
Euro+Mednot endemic: Russia (S European RussianativeA); Ukraine, with CrimeanativeA,B,C
Bibliography
A.Fedorov, A. A. 1981: Flora partis europaeae URSS 5. – Leningrad
B.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
C.Prokudin, J. N. 1987: Opredelitel’ vysših rastenij Ukrainy. – Kiev: Naukova Dumka