Orobanche ramosa subsp. ramosa

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 : 288

(a) Subsp. ramosa :

Stem usually branched. Flowers numerous. Calyx-teeth acuminate, usually shorter than tube. Corolla 10—13(—17) mm, whitish to pale blue or lilac; lobes of lower lip obtuse. Usually on cultivated plants, especially Cannabis sativa , Nicotiana tabacum and Solanum spp. S. & S.C. Europe; introduced further north.