Annual monoecious marsh herb 4–6.5 cm tall. Leaves alternate; submerged leaves thin, linear, rarely trifid with lobes 4 mm long, lamina 5–6 mm long; emergent leaves thick, linear, curved, lamina 2.5 mm long. Bracteoles linear to narrowly deltoid, 0.3 mm long, white. Flowers 4-merous, in clusters of 2 or 3 per axil. Male flowers sessile or shortly pedicellate; sepals absent; petals 0.8–1.1 mm long, reddish; stamens 4. Female flowers sessile; sepals and petals absent; ovary 4-locular, short collar at apex; styles clavate, becoming reflexed; stigmas white. Fruit sessile, cylindrical to urceolate, golden or reddish brown; mericarps cylindrical, 0.8–1.2 mm long, swollen and slightly rugose in lower 1/3, central 1/3 smooth and tapering, upper 1/3 an oblique acute collar.
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