Aquatic monoecious herb. Stems 8–9 cm high. Leaves alternate, oblanceolate to ±linear; lamina 4–5.5 mm long. Bracteoles lanceolate, entire, of male flowers 0.7 mm long; of females 0.4 mm long. Flowers 4-merous, solitary. Male flowers: pedicel 0.3 mm long; sepals absent; petals 2.3 mm long, persistent, reddish; stamens 8. Female flowers sessile; sepals and petals absent; ovary 4-locular; styles filiform, reflexed. Fruit sessile, deep chocolate brown; mericarps shortly cylindrical, 0.9–1 mm long, obliquely truncate, slightly swollen basally, heavily ribbed with 1 dorsal and 4 lateral (2 each side) smooth ribs.
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