Lonicera periclymenum subsp. periclymenum

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 48

(a) Subsp. periclymenum :

Leaves usually subacute, glabrous or slightly pubescent beneath, the upper pair usually sessile. 2n = 18, 36, 54. Throughout the range of the species except S. Spain and S. Portugal.