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Perennial, rootless submerged carnivorous plant with thin, linear, poorly branched shoot, free-floating. Shoot 8–20 cm long with regular leaf whorls, leaf with one snapping trap 3–6 mm long as two mobile lobes, fine bristles extend the trap. Solitary white flowers above water on a stalk 10–15 mm long, green fertile capsules with 1–12 seeds under water, the most capsules pale and sterile. Overwintering in 6–8 mm large, rhomboid-shaped dormant turions, actively sink down in autumn and float up in spring.
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