Primrose family (Primulaceae)
Perennial with creeping rhizome and leaves submerged in water. Stem 15-60 cm long. Leaves arranged helically, below flower-stem arranged in rosette; feathery pinnate, with filamentous sections up to 5 cm in length. Flower stems reach to 10-30 cm, with apical inflorescence of raceme type. Stalked flowers arranged, 3-6 together, in whorls. Quintupartite calyx conjoined at base. Corona with 5 pink or white segments of length 6-9 mm. Flowers May-Jul.
Grows in eutrophic standing waters, for example in alder-currant forest, ditches and oxbow lakes.
Descriptions devised by the team at the Independent Department of Forest Botany, Warsaw University of Life Sciences, i.e. L. Witkowska-Żuk, K. Marciszewska, W. Ciurzycki, A. Obidziński and P. Zaniewski.