Oenothera strida, Ledeb. ex Link

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 : 308

12. O. strida Ledeb. ex Link , Enum. Hort. Berol. Alt. 1: 377 (1821).

20-100 cm, erect, villous. Basal leaves 5-10x0-5-1-8 cm, oblanceolate or linear; cauline leaves 2-5(-9) x 0-5-3 cm, narrowly lanceolate, denticulate, undulate. Hypanthial tube 15-30 mm. Petals 20-45 mm. Anthers 7-8 mm; filaments 10-20 mm. Capsule 2-2-5 x c. 0-3 cm, conspicuously enlarged in upper half. Seeds c. 1-5 mm, narrowly obovoid, smooth. 2n= 14. Locally naturalized in several districts, mainly in W. & C. Europe. [Az Co Ga Ge He Hs It Lu Rs (C).] (Temperate South America.)

O. laciniata Hill , Hort. Kew. 172(4) (1768) ( O. sinuata L. ), with sinuate-pinnatifid leaves and petals 5-18 mm, has been recorded for several countries, but does not seem to be effectively naturalized.