Sideritis spinulosa, Barnades ex Asso

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

14. S. spinulosa Barnades ex Asso , Enum. Stirp. Arag. no. 113 (1784)

(5. spinosa Lam. ).

Glabrescent to villous-tomentose perennial 10-30 cm. Leaves 10-20 x 7-8 mm, linear or lanceolate with 2-6 divaricate lateral spines. Verticillasters 5-12, c. 6- flowered, mostly crowded. Lower bracts 7-15 x 12-20 mm, exceeding the calyx, broadly ovate or cordate-ovate, very coarsely incise-dentate and spiny. Calyx 8-9 mm, with a ring of hairs inside. Corolla 8-9 mm, pale yellow, not exceeding calyx. 2/i = 22, 28, 30. • E. & C. Spain. Hs.