Plants aquatic or terrestrial, annual. Stems spreading (in water) or erect, yellow in age, branched, to 25 cm if aquatic, to 5 cm if terrestrial. Leaf blades lanceolate to oblanceolate, 2-5 mm, apex acute to obtuse. Inflorescences lax; flowers 1 per node. Pedicels 1-8 mm. Flowers 4-merous; sepals triangular-ovate, 0.4-0.7 mm, apex obtuse; petals lanceolate, 1.1-1.7 mm. Follicles ascending, 12-14-seeded, obliquely lanceoloid; old follicles spreading, flat. Seeds oblong with rounded ends, 0.2-0.4 × 0.1-0.2 mm, not papillate, dull, rugulose.
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