Marrubium alysson, 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 : 138

8. M. alysson L. , Sp. Pl. 582 (1753).

Stems up to 40 cm, densely white-lanate-tomentose, simple or with ascending to erect flowering branches. Leaves flabellate, long-cuneate, subsessile, deeply crenate distally, densely white-lanate, often glabrescent above. Verticillasters up to 12-flowered. Bracteoles absent or very small. Calyx-tube 4-5-5-5 mm, obscurely ribbed, densely lanate-tomentose; teeth 5, c. 3 mm, exceeding the corolla, 1-1-5 mm wide at the base, lanceolate, becoming rigid in fruit. Corolla purple, pubescent outside. Dry, stony ground. Spain, Sardegna, S.E. Italy. Hs It Sa.