Cuscuta approximata subsp. approximata

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 : 77

(a) Subsp. approximata

( C. cupulata Engelm. ):

Flowers 3-4 mm. Fleshy apex of the calyx-lobe short, obtuse. Throughout the range o f the species.