Linum strictum subsp. strictum

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 210

(a) Subsp. strictum :

Stems robust, seldom branched below; inflorescence a dense, spike-like cyme or a corymb; flowers sessile, or subsessile with thick pedicels rarely longer than the calyx. Throughout the range of the species.