Stem to at least 40 cm; internodes short. Leaves ovate to lanceolate, 10-20 x 6-8 mm, somewhat recurved, obtuse, 3-5-veined; margin undulate and minutely denticulate. Peduncles 0.5-1.5 cm, recurved especially in fruit. Fruitlets 2.5-3 mm, obovate, shortly beaked. Fl.5-9. Streams, rivulets, springs, channels, ditches, pools, usually in running water, s.l.-2350 m.
W.& C. Europe, Mediterranean area, Caucasia, N.W. Iran. Euro-Sib. element.