Marrubium cylleneum, Boiss. & Heldr.

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 : 137

2. M. cylleneum Boiss. & Heldr. , loc. cit. (1859).

Like 1 but leaves broadly obovate to suborbicular; indumentum yellowish; calyx-tube 5-6-5 mm, the teeth less densely villous; corolla yellowish. Mountain rocks. • 5. Albania; S. Greece. Al Gr. Some specimens from Albania have 10 calyx-teeth; they may be hybrids between 2 and 10, but their nature and status are obscure.