Linum perenne, L.

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 : 208-209

18. L. perenne L. , Sp. Pl. 277 (1753).

Stems 10-60 cm, decumbent, ascending or erect. Middle cauline leaves 1- to 3-veined. Inflorescence usually many-flowered. Inner sepals acute or obtuse. Pedicels erect. Capsules 5-8 mm. Heterostylous. C. & E. Europe, extending locally westwards to Britain and the

Pyrenees. Al Au Br Bu Cz G a Ge G r He Hs Hu It Ju Po Rm Rs (N, C, W, E). 1 Upper cauline leaves 3-veined; inner sepals twice as long as wide (e) subsp. extraaxillare

1 Upper cauline leaves 1-veined; inner sepals less than twice as long as wide

2 Inner sepals very obtuse, longer than the outer (lowlands)

3 Stems erect from an ascending base; pollen grains with furrows (a) subsp. perenne

3 Stems usually decumbent or ascending; pollen grains with pores (b) subsp. anglicum

2 Inner sepals acute or obtuse, equalling the outer (mountains)

4 Pollen grains with furrows (c) subsp. alpinum

4 Pollen grains with pores (d) subsp. montanum