Japan Flora: Submerged stems slender, soft, 30-40 cm. long; leaves floating, flat, flaccid, 40-50 cm. long, 2-2.5 mm. wide, not 1?eled, with a slighdy dilated sheath at base; spikes aerial, 10-15 cm. long, with 1 or 2 branches; staminate heads few, contiguous; pistillate heads 1-3 on each branch, globose, 7-8 mm. across in fruit, the lower ones ped uncled and provided with a leafy bract; flowers with linear-spathulate perianth segments about 1.5 mm. long; fruit broadly ovoid, conical, subsessile, not angled, about 3 mm. long, 2 mm. in diameter; stigma ovate-peltate. July-Aug. Ponds in high mountains; rare.

Hondo (Echigo). Europe, Siberia, and Kamchatka.