Dracocephalum ruyschiana, L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 161

3. D. ruyschiana L. , Sp. Pl. 595 (1753).

Perennial; stems up to 60 cm, erect or ascending, glabrous or shortly hairy. Leaves 20-70 x 2-9 mm, linear-lanceolate, entire, obtuse, glabrous, the margins revolute; lower leaves shortly petiolate, the upper sessile. Verticillasters 2- to 6-flowered, forming a dense, terminal spike. Bracts ovate-lanceolate, entire. Corolla 20-28 mm, blue to violet, rarely pink or white. Anthers hairy. 2« =14. U.S.S.R. and C. Europe, extending locally westwards to Norway and the Pyrenees. Au Ga Ge He Hu It No Po Rm Rs (N, B, C, W, E) Su.