Sideritis incana subsp. incana

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 : 142

(a) Subsp. incana :

Plant densely tomentose when young, becoming sparsely tomentose. Verticillasters 2-5. Lower bracts 4-10 x 6-8 mm, toothed. Calyx 5-6 mm. Corolla yellow. • C. Spain.