Distribution: East of the Cascades, British Columbia to California, east to Nova Scotia and Maine.
Habitat: Ditches, ponds and wet places.
Flowers: Late June - August
Conservation Status: Not of concern
Perennial from slender rhizomes, the stems 1.5-4 dm. tall, arising singly from swollen nodes.
Leaves alternate, 1-3, the blades semi-terete, with prominent partitions; leaf bases sheathing, the sheaths projecting into rounded auricles 1 mm. long.
Inflorescence terminal, up to 5 cm. long, exceeded by the upper leaf and the involucral bract; heads 3-15, many-flowered, up to 1 cm. long; perianth about 3.5 mm. long, greenish-brown to tawny, the 6 segments narrowly lanceolate, acuminate and somewhat awl-shaped, subequal; stamens 6.
Capsule conic, tapered almost from the base to a long beak that much exceeds the perianth.