Distribution: West of the Cascades, southern British Columbia south to coastal California.
Habitat: Marshes and river bottoms from tidelands to the lower mountains.
Flowers: Late May - August
Conservation Status: Not of concern
Perennial, the stems 4-8 dm. tall, closely spaced on stout rhizomes.
Leaves alternate, 2-4 per stem, the upper ones with long, terete blades with prominent partitions; leaf bases sheathing, with rounded auricles 2-4 mm. long.
Heads 3-9, many-flowered, 8-12 mm. broad, assembled into 1-3 clusters 1-2 cm. broad; perianth tawny to deep brown, the 6 segments subequal, narrowly lanceolate and sharp-pointed; stamens 3.
Capsule about equal the perianth, cylindric, narrowed to a short beak.