Stems terete, little branched. Submersed leaves petiolate; blades narrowly ovate, often falcate, 8–20 × 2–5 cm; stipules 4–10 mm long, not sheathing. Floating leaves long-petiolate; blades elliptic, 5–10 cm long. Spikes 3–6 cm long, continuous. Tepals green or purplish, 2–3 mm long. Fruits 4–6 mm long, barely keeled with a short, curved beak (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).