Lactuca quercina, L.

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 : 329

6. L. quercina L. , Sp.Pl. 795 (1753).

Annual or biennial. Root tuberous. Stem 30-100(-l 50) cm, erect. Leaves thin, sagittate-amplexicaul at base; lower lyrate-pinnatifid with large, ovate terminal segment, petiolate; upper oblong-elliptical to lanceolate, entire or pinnatifid to pinnatisect with oblong-ovate, dentate segments; all with sagittate-amplexicaul base. Inflorescence a dense, usually corymbose panicle. Capitula with 7—15(—22) florets. Ligules yellow. Involucral bractsoften with appendages. Achenes 7-8 mm; body oblong-elliptical, setose at apex, 5-ribbed, black; beak as long as body. Pappus white. C. & E. Europe, from Bulgaria northwards to C. Germany and S.C. Russia, S.ÏV. Alps', one station in Gotland. Al Au Bu Cz Ga Ge Gr Hu It Ju Rm Rs (C, W, K, E) Su?Tu.