Schoenoplectus etuberculatus (Steud.) Soják

Scirpus etuberculatus (Steud.) Kuntze, Rev. Gen. 2: 758. 1891.
Scirpus tnaritimus y cylindricus Torr. Ann. Lye. N. Y. 3: 325. 1836.
Rhynchospora etuberculata Steud. Syn. PI. Cyp. 142. 1855.
Scirpus tnacranthus Bock. Flora 41: 412. 1858.
Scirpus leptolepis Chapm. Fl. S. U. S. 520. 1860.
Scirpus Canbyi A. Gray; Canby, Proc. Acad. Phila. 1864: 18. 1864.
Scirpus cylindricus Britton, Trans. N. Y. Acad. 11: 79. 1892.
Perennial; culms 1-1.5 m. tall, 5-10 mm. broad at the base, very soft and spongy, smooth, obscurely trigonous, erect from a scaly, reddish rhizome ca. 3 mm. thick; blades 1-several,
* The principal divisions of the genus in Reichenbach's treatment are here interpreted as of sectional rank. elongate, arising at the base and nearly equaling the culm, smooth, flat, soft, blunt-tipped, ca. 6-8 mm. broad near the base, narrowing upwards; outer involucral bract 2-3 dm. long, smooth, blunt-tipped, obscurely trigonous; second involucral bract often present, to 1 dm. long; spikelets ca. 2 mm. long, 6-20 on smooth rays to 1 dm. long; scales ca. 6 mm. long, narrow, glabrous, blunt-tipped, brown or slightly reddish; style trifid; bristles 6, somewhat scabrous above, equaling the tubercle; body of the achene 3.5-4 mm. long, dark-brown, smooth, trigonous, the prominent tubercle 1 mm. long.
Type locality: Louisiana.
Distribution: Swamps near the coast; Maryland, south to Florida, west to Louisiana.