Mertensia Roth

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 : 109

25. Mertensia Roth 2

Perennial, usually glabrous herbs. Flowers in terminal cymes. Calyx lobed to the base, not accrescent. Corolla blue, pink or white, cylindrical or with campanulate limb, without scales but often with 5 invaginations in the throat. Stamens included or slightly exserted, inserted in upper part of tube. Style included or exserted; stigma very small, entire. Nutlets flattened-trigonous, fleshy, strongly angled.