Plants perennial. Vegetative stems submersed and growing to surface, or emersed and contracted, procumbent. Flowering stems less than 5 mm, no visible distal internode. Sessile leaves alternate or appearing opposite at nodes with inflorescences, blade linear, thin; submersed leaves 3–10 cm × 1–5 mm, emersed leaves 2–4 cm × 1–3 mm. Petiolate leaves and stipules not produced. Inflorescences 1-flowered; spathes 12–45 mm, glabrous; peduncle absent. Flowers opening within 2 hours after dawn, wilting by dusk; perianth yellow, salverform, tube 1.5–11 cm, limb lobes equal, of uniform color, linear, 4–11 mm; stamens equal, 2–10 mm; filaments centrally inflated, glabrous; anthers coiling after anthesis, by early afternoon; style glabrous or scarcely pubescent. Seeds 7–30, 12–22-winged, 1–1.6 × 0.5–1.3 mm. 2n = 30.
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