Marrubium velutinum, Sibth. & Sm.

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

5. M. velutinum Sibth. & Sm. , FI. Graec. Prodr. 1: 412 (1809).

Stems up to 40 cm, yellowish-tomentose, simple or with short non-flowering branches. Leaves broadly ovate to orbicular, regularly and shallowly crenate-serrate, yellowish-appressed- tomentose above, white-tomentose beneath, shortly petiolate. Verticillasters many-flowered, globose. Bracteoles about as long as calyx-tube, subulate, more or less villous. Calyx-tube 4-5-5(-6) mm, 10-ribbed, yellowish-pubescent to -tomentose; teeth 5, 5-5-5 mm, exceeding the corolla, less than 1 mm wide at the base, subulate, not becoming rigid in fruit. Corolla yellow, pubescent outside. Mountain rocks. N. & C. Greece. Gr.