Onosma tricerosperma subsp. tricerosperma

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 : 91

(a) Subsp. tricerosperma :

Stem usually reddish-purple; setae with large conspicuous tubercle at base; leaves green; nutlets 7-9 mm, with horns up to 5 mm. S.E. Spain (near Alcaraz).