(modifié de Coste, Flore de la France 1937) :
Écologie : (répartition d'après la flore) Eaux courantes, sources, fontaines, ruisseaux; dans presque toute la France.
Répartition hors de France : Europe presque toute entière; Groenland.
(modified from Butcher, British Flora 1961):
NOTE: the French text is more complete and up-to-date
Stems very slender, 25-100 cm long.
Ecology UK: (distribution according to flora) A rather common plant of lakes and streams, particularly in Scotiand
France:
Distribution outside France: ?
Fleurs : styles très longs, réfléchis de bonne heure sur le fruit, caducs
Floraison France : Juin-octobre
Flowers: 1.4 x 1.1 mm, sessile, longer than broad, with almost straight sides and with a blunt keel, lobes parallel; bracts hooked, overlapping, soon falling; styles 7 mm, reflexed and soon falling.
Flowering UK: Mid June-late Sept.