Cyperus tetragonus Elliott

The status of Cyperus pringlei from the southwestern United States requires further study.

Herbs, perennial, cespitose, rhizomatous. Culms trigonous, (20–) 30–80 cm × 1–2.5 mm, glabrous or occasionally with scattered prickles on distal angles. Leaves 9–11, flat to slightly V-shaped, 25–80 cm × 3.5–10 mm. Inflorescences: spikes (1–)3–6, loosely cylindric or oblong with parallel sides, 1.5–4 cm × 10–17 mm; rays 6–12, 2–25 cm, glabrous or rarely scabridulous proximal to spikes; bracts 6–11, ascending at 45°, flat, (1–)10–20(–26) cm × 1–10 mm; rachilla deciduous, wings persistent, 0.4–0.5 mm wide. Spikelets 10–60, narrowly ellipsoid, quadrangular, 5–8 × 1.5–2 mm; floral scales persistent, (2–)3–7, appressed, clear at maturity, laterally reddish to purplish brown, medially greenish, often erose at maturity, laterally 3–5-ribbed, medially 3-ribbed, ovate-elliptic, 2.5–3.2 × 1.8–2.1 mm, apex obtuse. Flowers: anthers 0.8–1 mm; styles 0.3–0.5 mm; stigmas 2–2.5 mm. Achenes brown to reddish brown, sessile, oblong-ovoid to broadly ellipsoid, slightly dorsiventrally flattened, 1.8–2 × 0.7–0.8 mm, apex obtuse, apiculate, surfaces papillose to puncticulate.

Ala., Ariz., Fla., Ga., Miss., N.Mex., N.C.

Fruiting summer–fall (Jun–Nov).

Open woods, thickets, barrier islands; 0–1000m.

Cyperus pringlei Britton; C. tetragonus var. pringlei (Britton) Kükenthal; Mariscus tetragonus (Elliott) C. B. Clarke

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

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

Cyperus tetragonus là loài thực vật có hoa trong họ Cói. Loài này được Elliott mô tả khoa học đầu tiên năm 1816.