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Carex oligosperma

Carex oligosperma Michx.  
Family: Cyperaceae
Few-Seed Sedge, more...fewseed sedge
[Carex oakesiana, moreCarex oligosperma var. churchilliana Raymond]
Carex oligosperma image
Paul Rothrock
  • FNA
  • Gleason & Cronquist
  • Indiana Flora
  • Resources
Peter W. Ball & A. A. Reznicek in Flora of North America (vol. 23)
Plants loosely cespitose; rhizomes long. Culms obtusely trigonous in cross section, 30-90 cm, smooth or scabrous-angled distally. Leaves: basal sheaths reddish purple; ligules as wide as long to wider than long; blades dark green, wiry, filiform, with involute margins, 0.5-2.5 mm wide, glabrous. Inflorescences 3-20 cm; proximal bract 3-15(-25) cm, shorter than to exceeding inflorescence; proximal 1-2 spikes pistillate, erect, ovoid to cylindric; terminal 1(-2) spikes staminate. Pistillate scales ovate, 3.2-5.6 × 2.6-3.8 mm, shorter than perigynia, margins entire, apex obtuse to acute, awnless. Perigynia ascending, 7-15-veined, veins extending into beak, ovate, 4-6.7 × 2.5-3.4 mm, leathery, apex tapered; beak 0.3-0.9 mm, obscurely bidentulate, glabrous, teeth straight to somewhat outcurved, to 0.3 mm. Stigmas 3. Achenes brown, trigonous, smooth.

Fruiting summer. Bogs, often forming extensive stands in Sphagnum-dominated areas, poor fens, sometimes in acidic, sandy, or peaty soils in open swamps, marshes, lakeshores, riverbanks; 0-1200 m; Man., N.B., Nfld. and Labr., N.S., Ont., Que., Sask., Yukon; Ind., Maine, Mich., Minn., N.H., N.Y., N.C., Ohio, Pa., Vt., Wis.

Carex oligosperma hybridizes rarely with C. rostrata.

Vascular plants of NE US and adjacent Canada
Colonial by creeping rhizomes, forming a turf; stems slender, 4- 10 dm, purplish at base; lvs pale green, stiff, elongate, involute, 1-3 mm wide; ligule much wider than long; staminate spike usually solitary; pistillate 1, or 2 or 3 and widely separated, sessile or nearly so, ovoid to short-cylindric, 1-2 cm; lowest bract lf-like but not sheathing; perigynia 3-15(-18), ovoid and somewhat inflated but also compressed, 4-7 mm, half as thick, strongly several-nerved, abruptly narrowed into an emarginate beak 1-2 mm; achene trigonous, obovoid, 2-3 mm; style persistent, usually contorted at base; 2n=76. Grassy bogs and wet meadows; Nf. to Mack., s. to Conn., Pa., Ind., and Wis.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
From Flora of Indiana (1940) by Charles C. Deam
Frequent in the dune area, otherwise quite local in northern Indiana. It prefers Chamaedaphne and tamarack bogs, but is found also in marshes and swales and on borders of ponds.

......

Indiana Coefficient of Conservatism: C = 10

Wetland Indicator Status: OBL

Carex oligosperma
Open Interactive Map
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Nathanael Pilla
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Nathanael Pilla
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Nathanael Pilla
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Nathanael Pilla
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Morton Arboretum
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Morton Arboretum
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