Schoenoplectus torreyi

(Olney) Palla

Allg. Bot. Z. Syst. 17(Beil.): 3. 1912.

Common names: Torrey’s three-square bulrush Torrey’s bulrush scirpe de Torrey
Basionym: Scirpus torreyi Olney Proc. Providence Franklin Soc. 1: 32. 1847
Treatment appears in FNA Volume 23. Treatment on page 54. Mentioned on page 46, 51.

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.

Phenology: Fruiting summer.
Habitat: Emergent in fresh ponds and marshes, often with fluctuating water levels
Elevation: 10–200 m


V23 76-distribution-map.jpg

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.


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)].

Selected References


Lower Taxa

... more about "Schoenoplectus torreyi"
S. Galen Smith +
(Olney) Palla +
Scirpus torreyi +
Torrey’s three-square bulrush +, Torrey’s bulrush +  and scirpe de Torrey +
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. +  and Wis. +
10–200 m +
Emergent in fresh ponds and marshes, often with fluctuating water levels +
Fruiting summer. +
Allg. Bot. Z. Syst. +
Schoenoplectus torreyi +
Schoenoplectus sect. Malacogeton +
species +