Amphiscirpus nevadensis (S. Watson) Oteng-Yeb.

Amphiscirpus nevadensis superficially resembles some dwarfed forms of Schoenoplectus pungens, with which it sometimes grows; S. pungens is readily distinguished by its trigonous culms and leaf blades, prominently 2-fid, awned scales, and beaked achenes. Amphiscirpus nevadensis differs from all North American species of Schoenoplectus in its wiry culms and leaves, prominently ciliate ligules, absence of evident internal aerenchyma, and beakless achenes. It has been reported from Delta, Manitoba.

Rhizomes 1–4 mm diam., tough, hard. Culms ridged, 10–70 cm × 0.5–2 mm, hard, without evident internal air cavities. Leaves 5–10; sheaths loose, the proximal often disintegrating to prominent fibers, often stramineous or brownish, papery, fronts membranous-hyaline with delicate veins, summit slightly concave with V-shaped veinless area and often disintegrating; blades 0.5–1 times as long as culms, hard, without evident internal air cavities; distal blades 3–30 cm × 0.5–2 mm, longer than sheaths, margins sparsely antrorsely spinulose or papillose, apex sharply acute. Inflorescences: proximal involucral bract 1–15 cm, resembling foliage leaf blade. Spikelets ovoid to lanceoloid or terete, 5–20 × 3–5 mm; scales pale to dark red-brown, midribs usually stramineous, smooth; proximal 1 or 2 scales often resembling involucral bracts, with awnlike blades, to 15 mm; other scales in proximal part of spikelet prominently 9-veined, ovate, 4 × 3 mm, papery to often cartilaginous, margins hyaline, ciliolate, apex entire, acute to rounded. Flowers: perianth bristles pale brown, unequal. Achenes greenish to orange-brown, broadly obovoid, 2–2.3 × 1.5–1.7 mm.

Alta., B.C., Sask.; Calif., Colo., Mont., Nebr., Nev., N.Dak., Oreg., Utah, Wash., Wyo.; South America (Argentina, Chile).

Fruiting summer.

Sunny, saline, often alkaline, seasonally wet places; 400–2400m.

Scirpus nevadensis S. Watson, Botany (Fortieth Parallel), 360. 1871

Scirpus nevadensis S. Wats. Bot. King's Expl. 360. 1871
Scirpus remireoides Griseb. Abh. Ges. Wiss. Gott. 19: 267. 1874. Scirpus chubutensis Clarke, Kew Bull. Add. Ser. 8: 89. 1908.
Perennial; culms 0.5-4.5 dm. tall, stout, smooth, conspicuously grooved, trigonous, arising from a scaly rhizome to 7 mm. thick which grows 1-1.5 dm. below the ground; leaves numerous, stiff, ca. 1 mm. broad, pointed, often equaling but hardly exceeding the culm, the sheaths numerous, persistent, light brown; involucral bract 1-7 cm. long; scales walnut-brown, ovate; style bifid; bristles 1-3, much shorter than the achene; achene 2 mm. long, 1.25 mm. broad, broadly ovate, planoconvex, minutely reticulate.
Type locality: Soda Lake, Carson County, Nevada.
Distribution: Moist alkali spots in desert regions; British Columbia to Saskatchewan, south to Nebraska, Colorado, Wyoming, southern Nevada, and adjacent California; Argentina.

Amphiscirpus es un género monotípico de plantas herbáceas de la familia de las ciperáceas. Su única especie, Amphiscirpus nevadensis, (S.Watson) Oteng-Yeb.​ es originaria de América.

Amphiscirpus nevadensis là một loài thực vật có hoa trong họ Cói. Loài này được (S.Watson) Oteng-Yeb. mô tả khoa học đầu tiên năm 1974.