Carex lacustris

Willdenow

Sp. Pl. 4(1): 306. 1805.

Common names: Carex lacustre
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 493. Mentioned on page 491, 494, 497, 499, 507.

Plants colonial; rhizomes long-creeping. Culms lateral, coarse, trigonous, 50–135 cm, smooth or somewhat scabrous-angled distally. Leaves: basal sheaths reddish purple, strongly fibrillose, bladeless; longest ligules 13–40 (–56) mm, much longer than wide; blades glaucous to pale green, M-shaped, (5.5–) 8.5–21 mm wide, glabrous. Inflorescences 17–60 cm; proximal 2–4 spikes pistillate, ascending to arching; distal spikes erect; terminal 3–5 (–7) spikes staminate. Pistillate scales lanceolate to ovate, apex obtuse to acuminate, glabrous, awn 0.3–3.5 mm, ± scabrous. Perigynia ascending, usually strongly 14–28-veined, narrowly ovoid to narrowly ellipsoid, (4.5–) 5.2–7.8 × 1.6–2.5 mm, glabrous; beak obscure, 0.5–1.6 mm, bidentulate, teeth straight, 0.2–0.7 (–0.9) mm. 2n = 74.


Phenology: Fruiting May–Jul.
Habitat: Open swamps, wet, open thickets, marsh edges, sedge meadows, fens, shores of streams, ponds and lakes
Elevation: 0–1000 m

Distribution

V23 913-distribution-map.jpg

Alta., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., Que., Sask., Conn., Del., D.C., Idaho, Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., N.H., N.J., N.Y., N.Dak., Ohio, Pa., R.I., S.Dak., Vt., Va., W.Va., Wis.

Discussion

Carex lacustris is abundant and often a dominant of calcareous, north-temperate wetlands. Sometimes extensive stands are seen without fertile culms.

Rare hybrids between Carex lacustris and C. hyalinolepis, C. pellita, C. trichocarpa (P. M. Catling et al. 1989), and C. utriculata are known; the hybrids are sterile and intermediate in morphology and can form extensive clones.

Selected References

None.

Lower Taxa

None.

"lengthofbody" is not declared as a valid unit of measurement for this property.

... more about "Carex lacustris"
trigonous +
smaller +
A. A. Reznicek +  and Paul M. Catling +
Willdenow +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
shortened +
rounded +
bidentulate +
straight +
emarginate +  and bidentate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
glabrous +  and glaucous +
m--shaped +
8.5mm;21mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex lacustre +
involute +  and channeled +
red tinged +
scabrous-angled +  and trigonous +
50 cm500 mm <br />0.5 m <br /> (135 cm1,350 mm <br />1.35 m <br />) +
with awn +  and acuminate +
Alta. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, Que. +, Sask. +, Conn. +, Del. +, D.C. +, Idaho +, Ill. +, Ind. +, Iowa +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.Dak. +, Ohio +, Pa. +, R.I. +, S.Dak. +, Vt. +, Va. +, W.Va. +  and Wis. +
0–1000 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Open swamps, wet, open thickets, marsh edges, sedge meadows, fens, shores of streams, ponds and lakes +
17 cm170 mm <br />0.17 m <br /> (60 cm600 mm <br />0.6 m <br />) +
staminate +, prophyllate +, pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
pubescent;,;glabrous +
septate-nodulose +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
4 cm40 mm <br />0.04 m <br /> (5.6 cm56 mm <br />0.056 m <br />) +
much longer than wide +
1.3 cm13 mm <br />0.013 m <br /> (4 cm40 mm <br />0.04 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
0.52 cm5.2 mm <br />0.0052 m <br /> (0.78 cm7.8 mm <br />0.0078 m <br />) +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Fruiting May–Jul. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
adventitious +
basal +  and proximal +
lanceolate;ovate +
ladder-fibrillose +
shorter or longer +
septate-nodulose +
0 cm0 mm <br />0 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
W1 +, Illustrated +  and Endemic +
staminate +  and pistillate +
ascending +  and arching +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +  and persistent +
2-3(-4)-fid +
Carex lacustris +
Carex sect. Paludosae +
species +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
straight +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
plant +  and colonial +