Cyperus houghtonii

Torrey

Ann. Lyceum Nat. Hist. New York 3: 277. 1836.

Common names: Houghton’s flatsedge
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 175. Mentioned on page 144, 147, 174.

Herbs, perennial, cespitose, bases cormose, rhizomatous. Culms trigonous, 5–50 cm × 0.5–1.5 mm, glabrous. Leaves V-shaped, 12–30 cm × 1–6 mm. Inflorescences: spikes ± globose to broadly ovoid, 8–20 mm wide; rays 1–8 cm; rachis 2–5 mm, glabrous; bracts 3–8, weakly ascending, flat, 3–20 cm × 1–3.5 mm; rachilla deciduous, wingless. Spikelets 3–18, compressed, ovoid to oblong-lanceoloid, 4–15 × 2.6–3.4 mm; floral scales deciduous, 3–18, laterally stramineous to reddish brown, laterally 3–4-ribbed, broadly ovate, 1.8–2.5 × 1.3–1.6 mm, apex with mucro 0.1–0.2 mm. Flowers: anthers 0.5–0.7 mm; styles 0.4–0.6 mm; stigmas 1–1.5 mm. Achenes dark brown, sessile, broadly ellipsoid, 1.5–2 × 1–1.5 mm, apex obtuse, apiculate, surface glabrous, puncticulate, or papillose. 2n = 168, 170, 172.


Phenology: Fruiting summer.
Habitat: Riverbanks, sand bars, lakeshores, sand dunes, sandy openings in woods, especially among Jack pines
Elevation: 0–1100 m

Distribution

V23 292-distribution-map.jpg

Man., Ont., Que., Ill., Ind., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., Ohio, Pa., Vt., Va., W.Va., Wis.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus houghtonii"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Torrey +
Houghton’s flatsedge +
Man. +, Ont. +, Que. +, Ill. +, Ind. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.J. +, N.Y. +, Ohio +, Pa. +, Vt. +, Va. +, W.Va. +  and Wis. +
0–1100 m +
Riverbanks, sand bars, lakeshores, sand dunes, sandy openings in woods, especially among Jack pines +
Fruiting summer. +
Ann. Lyceum Nat. Hist. New York +
Illustrated +  and Endemic +
Undefined subg. Chlorocyperus +, Cyperus subg. Mariscus +  and Undefined subg. Papyrus +
Cyperus houghtonii +
Cyperus subg. Cyperus +
species +