Sideritis hyssopifolia, 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 : 141

8. S. hyssopifolia L. , Sp. Pl. 575 (1753).

Glabrescent to villous perennial up to 40(-80) cm. Leaves 5-35 x 2-10 mm, linear to ovate or obovate, oblanceolate to obspathulate, entire or shallowly toothed or crenate, sessile or shortly petiolate. Verticillasters 5-15, c. 6-flowered, mostly crowded into a dense spike. Calyx 6-8 mm, with a ring of hairs inside. Corolla c. 10 mm, yellow sometimes tinged with purple. 2« = 30, 32 + 6B, 34. Rocky places, woods and pastures. • S.W. Europe, mainly in the mountains, extending north-eastwards to the Swiss Jura. Ga He Hs It Lu [Ge].

Extremely variable and often divided into a number of subspecies or varieties, of which the following are the most distinct, although in the Pyrenees intermediates between them occur with narrow leaves, shorter than the internodes but with the bracts of subsp. (a) and often with 2-3 verticillasters only.