Schoenoplectus torreyi (Olney) Palla

Schoenoplectus torreyi is very locally distributed, and probably has been extirpated from many historic localities. A specimen from an uncertain locality in Kentucky was collected in 1830. I have not seen specimens from North Dakota, South Dakota, or Nebraska. Scirpus torreyi was placed in synonymy under S. subterminalis Torrey var. cylindricus (Torrey) T. Koyama [misapplied, = Bolboschoenus novae-angliae by T. Koyama (1962b)].

Plants mat-forming; rhizomes 1–3 mm diam. Culms sharply trigonous, sides concave distally, 0.4–1.5 m × 1.5–5 mm. Leaves 4–7, nearly equaling culm; sheath fronts delicately pinnate-fibrillose; blades 3–6, erect, the distal mostly longer than sheath, 1–2 mm, wide, proximally thickly V-shaped central region trigonous-channeled to laterally flattened, apically asymmetically laterally flattened-trigonous; apex often markedly eccentric, glabrous, smooth or angles papillose. Inflorescences capitate or 1 spikelet; proximal bract erect, resembling leaf blade, 3–20 cm. Spikelets 1–4, 7–18 × 3–5 mm; scales straw-colored to orange-brown or central region greenish, ovate-lanceolate, 4–5 × 2.5 mm, margins entire, smooth or awn sparsely spinulose, sometimes distally ciliolate at 40X, apex acute, mucronate, mucro 0.2–0.5 mm. Flowers: perianth members 6, brown, bristlelike, equaling to slightly exceeding achene, spinulose; anthers 2–3 mm; styles 3-fid. Achenes brown, compressed trigonous, ovoid to obovoid, 3.5–4.5 × 1.7–2 mm; beak 0.5–1 mm. 2n = 70.

Man., N.B., Ont., Que.; Conn., Del., Ill., Ind., Iowa, Ky., Maine, Mass., Mich., Minn., Mo., N.H., N.J., N.Y., Ohio, Pa., R.I., Vt., Va., Wis.

Fruiting summer.

Emergent in fresh ponds and marshes, often with fluctuating water levels; 10–200m.

Scirpus torreyi Olney, Proc. Providence Franklin Soc. 1: 32. 1847

Scirpus torreyi Olney, R. I. PI. 32. 1847
Perennial; culms 8-15 dm. tall, usually ca. 1 m. tall, erect, rather soft, trigonous, smooth, arising from a scaly, red rhizome 2-4 mm. thick; sheaths 1-3, green turning straw-brown, the blades to 6 dm. long, ca. 2 mm. broad, lax, smooth, blunt-tipped; outer involucral bract to 13 cm. long, mostly 6-7 cm. long, smooth; second involucral bract occasionally present, to 2 cm. long; scales straw-brown, lanceolate, hyaline-margined, mucronttetipped; style trifid; bristles 6, brown, retrorsely barbed, about equaling the achene; body of the achene 3-4 mm. long (the prominent beak ca. 1 mm. long), dark brown, smooth, trigonous, obovate. Type locality: Smithfield, Rhode Island.
Distribution: Wet places, local; Quebec, south to Delaware, west to Minnesota.

Schoenoplectus torreyi, common name Torrey bulrush or Torrey's bulrush, is a species of Schoenoplectus found in North America.

Schoenoplectus torreyi là loài thực vật có hoa trong họ Cói. Loài này được (Olney) Palla miêu tả khoa học đầu tiên năm 1911.