Distribution: Occurring on both sides of the Cascades crest in Washington and in the Columbia River Gorge. northern Washington to California, east across North America to the Atlantic Coast.

Habitat: Mud flats along streams, ponds and lakes.

Flowers: June-September

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Wind

Prostrate, sparsely pubescent annual, the hollow culms less than 1 dm. tall, rooting at the nodes.

Sheaths open; ligules a fringe of straight hairs 0.6 mm. long; blades flat to folded, 1-2 mm. broad.

Inflorescence a congested panicle 1.5-6 cm. long, the branches short, bearing spikelets nearly full length; spikelets 9- to 25-flowered, up to 1 cm. long; first glume 1-nerved, 1 mm. long, second glume 3-nerved, nearly 1.5 mm. long; lemmas keeled, distinctly nerved, glabrous, awnless, nearly 2 mm. long; paleas much shorter than the lemmas; anthers exerted.