Kongl. Svenska Vetenskapsakademiens Handlingar n.s. 44:555(5):84. 1916.
Rhizome absent. Cauline stems compressed-filiform, without spots, to 50 cm; glands white, 0.3–0.5 mm diam. Turions lateral, common, 3.5–9.5 cm × 2–5 mm, soft; leaves ± 2-ranked; outer leaves 3–4 per side, base not corrugate; inner leaves undifferentiated. Leaves submersed, ± spirally arranged, sessile, flaccid; stipules deliquescent, inconspicuous, convolute, free from blade, pale brown, not ligulate, 1–2 cm, not fibrous, not shredding, apex obtuse; blade dark green, linear, not arcuate, 3.5–9.5 cm × 1.5–2 mm, base slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, rounded or nearly acute to mucronate, lacunae in 1–2 rows each side of midvein; veins 9–17. Inflorescences unbranched, emersed; peduncles not dimorphic, axillary, erect, cylindric, 1.7–3.5 cm; spikes not dimorphic, cylindric, 10–30 mm. Fruits sessile, reddish brown, oblong-obovoid, compressed, abaxially ridged, not laterally keeled, 3–4 × 1.5–2 mm; beak nearly erect, 0.3–0.5 mm; sides without basal tubercles; embryo with 1 full coil.
Phenology: Fruiting early summer–late summer.
Habitat: Shallow water of ponds and lakes
Elevation: 0–915 m
Man., N.W.T., Ont., Nunavut, Que., Yukon, Alaska, Siberia.