Carex oligosperma Michx. - Few-seeded Sedge


 

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Carex oligosperma - (image 1 of 2)

 

Taxonomy

Family: Cyperaceae

 

Section Vesicariae

Habitat

Bogs, fens, shores, open swamps, in acidic, sandy or peaty soils.

Associates

 

Distribution

Newfoundland to Yukon, south to CT, PA, IN, WI, and MN; disjunct in NC.

Morphology

Colonial by long creeping rhizomes, often forming extensive stands; stems slender, 40-100 cm, purplish at the base; leaves pale green, stiff, elongate, involute, 1-3 mm wide; ligule much wider than long; terminal spike staminate, usually solitary or the one below it staminate as well; lower 1-2 spikes pistillate, erect, widely separated, sessile or nearly so, ovoid to short-cylindric, 1-2 cm; lowest bracts leaf-like but not sheathing; perigynia 3-15(-18), ovoid and somewhat inflated but also compressed, 4-7 mm, half as thick, strongly 7-15-nerved, abruptly narrowed to an emarginate beak 1-2 mm; achene trigonous, obovoid, 2-3 mm; style persistent, usually contorted at the base.

Notes

Fruiting June to August

Wetland indicator: OBL

Carex oligosperma is rather rare in NY but can be locally abundant in some of the larger peatlands of the Adirondacks.

References

Ball, P.W. and A.A. Reznicek. 2002. Carex, In: Flora of North America Editorial Committee, Eds. Flora of North America North of Mexico. Volume 23. Oxford University Press, New York.

 

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 


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Michael Hough 2018