Centaurium littorale subsp. littorale

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 : 58

(a) Subsp. littorale

( Erythraea littoralis (D. Turner) Fries ):

Stem, margins of leaves, bracts and calyx usually smooth; corolla-lobes 6-7 mm. Stamens inserted at apex or at the middle of corolla-tube ( var. glomeratum (Wittrock) Melderis ). 2« =38, 40, 42, c. 56. Maritime grassland and sandy places near the sea. N. Europe and W. part o f U.S.S.R.