Oenanthe fiuviatilis, (Bab.) Coleman

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 : 339

12. O. fiuviatilis (Bab.) Coleman , Ann. Nat. Hist. 13: 188 (1844).

Submerged, ascending or erect perennial. Roots entirely fibrous. Stem striate, hollow. Basal leaves 2- to 3-pinnate; lobes ovate or suborbicular, cuneate at base, shallowly lobed. Cauline leaves 1 - to 2-pinnate; lobes ovate, cuneate at base, shallowly lobed. Submerged or winter leaves 2-pinnate; lobes cuneate, cut at the ends into narrow lobes; lobes linear to filiform. Umbels leaf-opposed. Peduncle usually shorter than rays. Rays 6-15, not thickened in fruit. Pedicels not thickened in fruit. Fruit 5-6-5 mm, elliptical. Styles f as long as fruit or less. 2« = 22. In still or slowly flowing water. • W. Europe. Be Br Da Ga Ge Hb.

O. conioides Lange , Haandb. Danske FI. ed. 2,199 (1859), is an erect, robust, terrestrial state of 12, apparently confined to areas liableto flooding in the valley of the lower Elbe and two localities in Belgium.