Chaenorhinum serpyllifolium subsp. serpyllifolium

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 : 225

(a) Subsp. serpyllifolium :

Stems 5-25(-40) cm, branched from the base; branches ascending to erect. Calyx lobes c. 0- 5 mm wide, linear-spathulate. Corolla 9-15 mm, with more or less cylindrical tube. Cultivated ground and waste places. C. Spain.