Distribution: Along the Pacific Coast from Alaska to California, inland throughout Canada and the United States to the Atlantic Coast.
Habitat: Coastal in saline or brackish water, inland in ponds, ditches, and lakes.
Flowers: July - August
Conservation Status: Not of concern
Aquatic, submersed, herbaceous perennials, the stems filiform and branching, up to 8 dm. long.
Leaves mostly alternate, up to 12 cm. long and scarcely 0.5 mm. broad; stipules sheathing for 5-15 mm., the free tips 1-2 mm. long.
Flowers on short spikes enclosed in the sheathing leaf bases of the upper leaves, usually 2 flowers per spike; flowers naked, usually consisting of 2 stamens and 4 pistils, one stamen below and one above the pistils; peduncles greatly elongating and often coiled in fruit, becoming 3-30 cm. long.
Fruits ovoid and symmetrical to strongly asymmetrical, 1.5-3 mm. long.