Comments
provided by eFloras
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.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
provided by eFloras
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.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Distribution
provided by eFloras
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.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Flowering/Fruiting
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Fruiting May–Jul.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Habitat
provided by eFloras
Open swamps, wet, open thickets, marsh edges, sedge meadows, fens, shores of streams, ponds and lakes; 0–1000m.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA