Stem 40 cm. Leaves silver-green, flowers bright blue. Cold and shade resistant. Grow in any soil. C. ruthenica Lam. is of wide disribution. It occurs in in southern Russia, Caucasus (southern Transcaucasus), Central Asia (eastern regions) and in southestern Europe. Stem 1.0-1.5 m, branched, flowers pale yellow. Drought and cold resistant plant.

From the forests of the Carpathians and Eastern Europe.