Carex oligosperma

Michaux

Fl. Bor.-Amer. 2: 174. 1803.

Common names: Carex oligosperme
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 504. Mentioned on page 500, 502, 507.

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.


Phenology: Fruiting summer.
Habitat: Bogs, often forming extensive stands in Sphagnum-dominated areas, poor fens, sometimes in acidic, sandy, or peaty soils in open swamps, marshes, lakeshores, riverbanks
Elevation: 0–1200 m

Distribution

V23 937-distribution-map.jpg

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.

Discussion

Carex oligosperma hybridizes rarely with C. rostrata.

Selected References

None.

Lower Taxa

None.
... more about "Carex oligosperma"
trigonous +
not papillose +
A. A. Reznicek +  and Bruce A. Ford +
Michaux +
shortened +
not +  and fibrous +
truncate +  and rounded +
Vesicariae +
bidentulate +
emarginate +  and bidentate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
filiform +
0.5mm;2.5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex oligosperme +
brown +, reddish-brown +  and reddish purple +
scabrous-angled +  and trigonous +
30 cm300 mm <br />0.3 m <br /> (90 cm900 mm <br />0.9 m <br />) +
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. +  and Wis. +
0–1200 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Bogs, often forming extensive stands in Sphagnum-dominated areas, poor fens, sometimes in acidic, sandy, or peaty soils in open swamps, marshes, lakeshores, riverbanks +
3 cm30 mm <br />0.03 m <br /> (20 cm200 mm <br />0.2 m <br />) +
prophyllate +, pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
wider than long +
with (1-)3-6(-30) bristles and/or scales +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Fruiting summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
short-sheathed +, sheathless +  and leaflike +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
3 cm30 mm <br />0.03 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Fl. Bor.-Amer. +
adventitious +
green +  and dark-brown +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.56 cm5.6 mm <br />0.0056 m <br />) +
basal +  and proximal +
2.6mm;3.8mm +
septate-nodulose +
Illustrated +  and Endemic +
staminate +  and pistillate +
ovoid;cylindric +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
persistent +
2-3(-4)-fid +
Carex oligosperma +
Carex sect. Vesicariae +
species +
straight +
outcurved +
0 cm0 mm <br />0 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.67 cm6.7 mm <br />0.0067 m <br />) +
leathery +
2.5mm +  and 3.4mm +
plant +  and cespitose +