Bupleurum falcatum subsp. cernuum

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 349

(b) Subsp. cernuum (Ten.) Arcangeli, Comp. FI. Ital. ed. 2, 590 (1894):

Leaves linear, sessile; fruit c. 5 mm; ridges more or less winged. Pyrenees, S. Alps, Appennini , S. Carpathians, mountains o f Balkan peninsula, S. Russia. Subsp. dilatatum Schur , Enum. Pl. Transs. 253 (1866), is a tall plant, with usually obovate basal leaves and distinctly but shortly petiolate cauline leaves. It is known from Romania, Hungary and Czechoslovakia and has 2n = 32. It is not, however, clear whether there is a constant correlation between morphological characters and chromosome number.