Potentina norvegica, L.

24. P. norvegica L. , Sp. Pl. 499 (1753).

Annual or short-lived perennial. Flowering stems 10-70 cm, terminal, hirsute, sometimes with a few glands. Leaves ternate, rarely a few pinnate with 5 leaflets; leaflets 10-70 x 7—4-0 mm, obovate, elliptical or oblong, coarsely serrate or serrate-dentate or almost pinnatifid, green. Flowers numerous. Sepals c. 5 mm in flower, c. 10 mm in fruit, ovate, acute; epicalyx-segments oblong, subobtuse, longer than sepals in fruit. Petals 4-5 mm, yellow, shorter than or as long as sepals. Style conical-filiform. N, C. & E. Europe; a frequent casual elsewhere and sometimes naturalized. Au Cz Da Fe Ge It No Po Rm Rs (N, B, C, W, E) Su [Be Br Ga He Ho Ju]. This species appears to be spreading westwards; some authors believe it to be native only in E. & E.C. Europe.