Similar to the previous species but submerged leaves acute or acuminate with minutely or obscurely denticulate margins. Emerged or floating leaves elliptic or ovate-elliptic, petiolate, with cuneate to rounded bases, many veined; submerged leaves sessile, narrowly elliptic or elliptic-oblong to oblanceolate-oblong, translucent, margin minutely denticulate, acute or acuminate, 7-many nerved; stipules conspicuous. Fruitlets 2-3 mm long.

Type: Habitat in Europae fossis paludibus (Lapland) (P).

Distribution: Temperate and arctic regions of Europe, Asia and N. America.