STEMS: simple, 1.5 10 dm tall, erect but sometimes slender. LEAVES: (1.5 )2 8( 10) dm long, (5 )6 12( 15) mm wide, much longer than the stem, linear, flat, but slightly keeled to triangular keeled especially toward the somewhat expanded scarious margined base. INFLORESCENCES: simple, to 2 dm long; staminate heads 3 8, congested or confluent; pistillate heads 2 5, 1.8 3 cm in diam. when mature, the lowermost occasionally axillary or supra axillary, or pedunculate on a slender peduncle to 12 cm long. STAMINATE FLOWERS: perianth scales 2 4 mm long, oblanceolate, with a broadened erose apex; anthers 1 1.5 mm long, elliptic clavate. PISTILLATE FLOWERS: perianth scales (1 )1.5 2 mm long, oblanceolate, with a broadened erose apex; stigma linear, simple, (1 )1.5 2 mm long. FRUITS: 1 seeded, stipitate, the stipes 2.5 3.5( 6) mm long, the fruits 4 6 mm long, brown to greenish brown, fusiform, often constricted at the middle gradually to somewhat abruptly narrowing to a stylar beak, this 1.5 4( 5) mm long including the stigma. 2n = 30. NOTES: 2 vars., 1 in AZ; temperate regions. REFERENCES: Ricketson, Jon. 2001. Sparganiaceae. J. Ariz. – Nev. Acad. Sci. Volume 33(1).