Cichorium endivia subsp. endivia

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 : 305

(a) Subsp. endivia :

Stems (30-)60-120 cm. Leaves dentate to deeply pinnatifid, nearly glabrous. 2zz = 18. Widely cultivated as a salad plant, particularly in S. Europe.