Oenothera ammophila, Focke

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 : 307

9. O. ammophila Focke , Abh. Nat. Ver. Bremen 18: 182 (1905).

Stem up to 100 cm, decumbent, often procumbent, without red spots. Leaves white-hairy; cauline leaves dentate, bluish-green. Sepal-apices long, curved. Petals not more than 16 mm. Capsule red-striped when young. 2n - 14 (ring of 12 chromosomes and 1 bivalent at meiosis). Open, sandy habitats, especially on seashores. • Mainly in N. & W. Europe.?Br CzDaGaGeHo.

O. syrticola Bartlett in E. L. Greene, Cybele Columb. 1: 38 (1914), from E. North America, occurs sporadically in W. & C. Europe. It differs from 9 in its erect stems and strongly nodding inflorescence, reddish leaf-margins, short and straight sepal-apices and in its shorter petals (not more than 13 mm). It has 2n = 14 (ring of 14 chromosomes at meiosis).

O. rubricuspis Renner ex Rostanski, Fragm. FI. Geobot. 11: 512 (1965), from Germany (Hessen) and Belgium (Limbourg), is like 9 but has erect stems up to 200 cm and entire, dark green, cauline leaves. It has 2n = 14 (ring of 14 chromosomes at meiosis).