Silaum silaus, (L.) Schinz & Thell.

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 : 342

1. S. silaus (L.) Schinz & Thell. , Viert. Naturf. Ges. Ziirich 60: 359 (1915)

( Silaus pratensis Besser , inch S. besseri DC. , Silaum alpestre (L.) Thell. , S. flavescens (Bernh.) Hayek ).

Glabrous perennial 3-100 cm. Stem solid, striate. Basal leaves 2- to 4- pinnate, triangular in outline; segments long-stalked; lobes 5-20 mm, lanceolate to linear, finely serrulate, with prominent midrib, acuminate or obtuse and mucronate; apex often reddish; upper cauline leaves 1-pinnate or reduced to an inflated petiole. Rays 5-15, sharply angled. Bracts 0-3; bracteoles several, linearlanceolate, broadly scarious. Fruit 4-5 mm, ovoid-oblong to subcylindrical. W., C. & E. Europe. Al Au Be Br Cz Ga Ge He Ho Hs Hu It Ju Po Rm Rs (B, C, W, K, E) Su. Very variable in the shape of the leaf-lobes and the size and shape of the fruit, particularly in the eastern part of its range.

Variants with linear leaf-lobes and subcylindrical fruits c. 5 mm have been called S. alpestre (L.) Thell. in Hegi, III. Fl. Mitteleur. 5 (2): 1295 (1926).