Cyperus hypopitys G. C. Tucker

Cyperus hypopitys can be recognized by the combination of reddish floral scales and sharp-angled culms.

Herbs, perennial, rhizomatous, tending to form small clumps by basal offshoots. Culms triquetrous, bulbous, thickened, (20–)30–80(–90) cm × 0.7–1.2 mm, glabrous proximally, becoming trigonous strongly scabridulous on distal angles, clothed with persistent reddish fibers at base. Leaves flat to V-shaped, 20–45 cm × 2–4 mm. Inflorescences: spike 1, loosely ovoid to ovoid-ellipsoid, (1.5–)2.5–7 × (1–)1.5–3.5 cm; rays (1–)2–4, to 6 cm; 2d order rays rarely present, to 2 cm; 3d order rays absent; bracts (2–) 3, ± horizontal, 1–15(–21) cm × 0.4–3.5 mm; rachilla deciduous, wings hyaline, 0.3–0.4 mm wide. Spikelets (3–)8–26, reddish to reddish brown, linear, compressed-quadrangular, 8–18 × (2.4–)2.8–4 mm; floral scales deciduous, 6–16, laterally reddish, medially green, occasionally red-glandular, laterally strongly 3(–4)-ribbed, medially punctate, 1–3-ribbed, ovate-lanceolate, (2.6–)2.8–3.3 × (1.4–)1.6–1.8(–2) mm, apex weakly 3-dentate, mucronulate, with tuft of crystalline prickles, medially glabrous. Flowers: anthers 0.8–1.1 mm; styles 1–1.4 mm; stigmas 1–1.4 mm. Achenes brownish, stipitate, ellipsoid, 1.6–2 × (0.7–)0.9–1 mm, base whitish, stipe to 0.1–0.2 mm, apex obtuse, slightly apiculate, surfaces papillose.

Ariz.; Mexico (Chihuahua, Durango, Sinaloa, Sonora).

Fruiting late summer–early fall.

Canyons in pine forests; of conservation concern; 500–1500m.

Cyperus hypopitys is a species of sedge that is native to southern parts of North America.

Cyperus hypopitys adalah spesies tumbuhan yang tergolong ke dalam famili Cyperaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Cyperus hypopitys sendiri merupakan bagian dari genus Cyperus. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh G.C.Tucker.

Cyperus hypopitys là loài thực vật có hoa trong họ Cói. Loài này được G.C.Tucker mô tả khoa học đầu tiên năm 1994.