Carex oligocarpa

Willdenow

Sp. Pl. 4(1): 279. 1805.

Common names: Carex à fruits clairsemés
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 453. Mentioned on page 451, 452, 456, 460.

Plants densely cespitose; rhizome internodes 0.2–6 (–8) mm, 1.6–2.2 mm thick. Culms strongly purple-red to 3.2–8.8 cm high at base, 10–55 cm; longest vegetative shoots 0.88–1.4 times as long as longest culms. Leaves: sheaths glabrous; blades green, widest blades (1.8–) 2.4–4 (–4.6) mm wide, smooth abaxially. Inflorescences 0.46–0.94 (–0.99) of culm height; peduncles of lateral spikes barely scaberulous or smooth; peduncles of terminal spikes 2.6–113 mm, barely to much exceeding lateral spikes; proximal bract with sheath tight, abaxially glabrous, sheath front convex, elongated (0.8–) 1.1–4.0 mm beyond apex; ligules 0.8–4.1 (–6.4) mm; blade uniformly green; distal bract usually much exceeding terminal spike. Spikes 3–5, widely separate or distal 2–3 spikes overlapping; lateral spikes pistillate with 2–8 (–10) perigynia, (4–) 9–19 × 3.8–7.5 (–9.2) mm, ratio of spike length (in mm) to flower number = 1.5–3.8; terminal spikes (7–) 14–32 (–45) × 1.1–2.3 (–3) mm. Pistillate scales 2.8–6.8 × 1.5–2.4 mm, margins whitish, entire, apex with awn 0.7–4.1 mm. Staminate scales 4–5 × 1.3–1.6 mm. Anthers 2.8–3.5 mm. Perigynia distichously imbricate, 51–67-veined, unwrinkled, narrowly obovoidellipsoid, obtusely triangular in cross-section, 3.7–4.7 × 1.6–1.9 (–2) mm, (1.8–) 2.2–2.6 times as long as wide, dull, base gradually tapered, abruptly contracted; beak straight, 0.4–1.2 mm. Achenes obovoid, 2.8–3.4 × 1.5–1.8 mm, tightly enveloped by perigynia; stipe straight, 0.3–0.6 mm; beak straight, (0.05–) 0.2–0.4 (–0.5) mm.


Phenology: Fruiting spring–early summer.
Habitat: Mesic or dry-mesic deciduous forests, usually in calcium-rich loams on rocky slopes above streams
Elevation: 40–800 m

Distribution

V23 832-distribution-map.jpg

Ont., Que., Ala., Ark., Conn., Del., D.C., Ga., Ill., Ind., Iowa, Kans., Ky., Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., Tenn., Vt., Va., W.Va., Wis.

Discussion

Carex oligocarpa is frequent, particularly in the Midwest. When C. oligocarpa grows with C. planispicata, it usually grows farther upslope than C. planispicata, apparently in drier soils. The two species do grow intermingled in some localities.

Selected References

None.

Lower Taxa

None.
... more about "Carex oligocarpa"
0.28 cm2.8 mm <br />0.0028 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
smaller +
1.5mm;1.8mm +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Robert F. C. Naczi +  and Charles T. Bryson +
Willdenow +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
shortened +
tapered +
Griseae +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
straight +
excurved +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
m--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex à fruits clairsemés +
purple-red +
3.2 cm32 mm <br />0.032 m <br /> (?) +  and 8.8 cm88 mm <br />0.088 m <br /> (?) +
round +  and trigonous +
10 cm100 mm <br />0.1 m <br /> (55 cm550 mm <br />0.55 m <br />) +
Ont. +, Que. +, Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, Tenn. +, Vt. +, Va. +, W.Va. +  and Wis. +
40–800 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
1.5 +  and 3.8 +
biconvex +  and trigonous +
Mesic or dry-mesic deciduous forests, usually in calcium-rich loams on rocky slopes above streams +
0.46 +  and 0.94 +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
0.88-1.4 times as long as longest culms +
with (1-)3-6(-30) bristles and/or scales +
0.75 cm7.5 mm <br />0.0075 m <br /> (0.92 cm9.2 mm <br />0.0092 m <br />) +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
yellowbrown +  and dark-brown +
(1.8-)2.2-2.6 +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.47 cm4.7 mm <br />0.0047 m <br />) +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
Fruiting spring–early summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
adventitious +
staminate +  and pistillate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
basal +  and proximal +
2-keeled +
1.3mm;1.6mm +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
cylindric +
Illustrated +  and Endemic +
overlapping +  and separate +
0.26 cm2.6 mm <br />0.0026 m <br /> (11.3 cm113 mm <br />0.113 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
straight +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +  and 0.06 cm0.6 mm <br />6.0e-4 m <br /> (?) +
deciduous +
2-3(-4)-fid +
Carex sect. Oligocarpae +
Carex oligocarpa +
Carex sect. Griseae +
species +
3.2 cm32 mm <br />0.032 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
plant +  and cespitose +
2.4mm +  and 4mm +