Carex flava L.

Large yellow-sedge (en), Laîche jaunâtre (fr), Laîche jaune (fr)

Species

Angiosperms > Poales > Cyperaceae > Carex

Characteristics

Tufted, 1–8 dm; lvs flat, mostly 3–5.5 mm wide, the plants appearing leafier than no. 153 [Carex viridula Michx.]; terminal spike sessile or short-pedunculate, slender, staminate or with some distal perigynia, 6–24 mm; lateral spikes 2–5, pistillate, short and stout, 6–17 mm, all sessile or short-pedunculate and crowded at the summit, or 1 or 2 of the lower ± remote and more evidently pedunculate; bracts sheathless or nearly so (except those subtending any remote spikes), one or more of them with an elongate blade much surpassing the infl; pistillate scales strongly tinged with coppery brown, thus conspicuous in the spike; perigynia 3.7–6.2 mm, most of them spreading and evidently falcate-recurved, relatively slender and gradually tapering to the poorly defined, distally rough-margined beak, this 1.4–2.3 mm, set at a ± divergent angle to the body; perigynium-body strongly yellowish toward the base, usually more greenish (or eventually brownish) distally, prominently several-nerved on the upper surface, more obscurely so on the lower, achene hardly larger than in no. 153, a larger part of the perigynium thus empty; 2n=60, 64, 68, 70. Bogs and wet meadows in calcareous districts; circumboreal, s. in Amer. to N.J., Ind., Ida., and B.C. (C. laxior)
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Plants cespitose. Culms straight, 10–75 cm. Leaves of flowering stems shorter than to slightly exceeding culms, 5–30 cm × 1.6–4.7(–5.8) mm; ligules on distal cauline leaves truncate or rounded. Inflorescences: peduncles of terminal spikes 0.4–5(–9) mm; bracts to 18.5 cm × (0.7–)2–4.5 mm; inner band of sheaths truncate or concave. Spikes: proximal pistillate spikes (1–)2–5, contiguous or approximate, globose to elliptic, 8–22 × 7.5–12.7 mm; terminal staminate spikes sessile or pedunculate, 9–22 × 1.1–3 mm. Scales: pistillate scales reddish brown, 2.3–3.9 × 0.9–1.4 mm; staminate scales reddish brown, ovate, margins narrowly whitish hyaline, apex obtuse. Anthers 1–2.1 mm. Perigynia reflexed, bright yellow at maturity, 4–6.3 × 1–1.9 mm, apex gradually narrowed; beak 1.3–2.7 mm, forming angle of (15–)26–72° with body, scabrous. Achenes 1.3–1.7 × 0.9–1.2 mm. 2n = 60.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality monoecy
Pollination anemogamy
Spread hydrochory
Mature width (meter) -
Mature height (meter) 0.2 - 0.6
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Light 5-9
Soil humidity 5-9
Soil texture -
Soil acidity 4-8
Soil nutriment -
Hardiness (USDA) 8-10

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by divisions.
Mode divisions
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Habit

Carex flava habit picture by Arthur Schmidt (cc-by-sa)
Carex flava habit picture by Rudolf Eberli (cc-by-sa)

Leaf

Carex flava leaf picture by Georg Lanzl (cc-by-sa)
Carex flava leaf picture by Amanda O’Mara (cc-by-sa)
Carex flava leaf picture by bettybm (cc-by-sa)

Flower

Carex flava flower picture by Rudolf Eberli (cc-by-sa)
Carex flava flower picture by hilde decuypere hilde decuypere (cc-by-sa)
Carex flava flower picture by Alaux Arex (cc-by-sa)

Fruit

Carex flava fruit picture by Imp Press (cc-by-sa)
Carex flava fruit picture by Halbe Marianne (cc-by-sa)
Carex flava fruit picture by Arthur Schmidt (cc-by-sa)

Distribution

Carex flava world distribution map, present in Albania, Austria, Bulgaria, Canada, Switzerland, Czech Republic, Germany, Denmark, Algeria, Spain, Finland, France, Micronesia (Federated States of), Greece, Hungary, Iran (Islamic Republic of), Iceland, Italy, Morocco, Malaysia, Netherlands, Norway, Poland, Romania, Russian Federation, Sweden, Turks and Caicos Islands, and United States of America

Conservation status

Carex flava threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:30043428-2
WFO ID wfo-0000346670
COL ID R99Q
BDTFX ID 13763
INPN ID 88511
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Carex lepidocarpa f. intermedia Carex oederi f. graminis Carex flava f. patula Carex flava f. remotiuscula Carex flava f. uetliaca Carex flava f. umbrosa Anithista flava Carex echinata Carex flavofulva Carex laxior Trasus flavus Proteocarpus flavus Carex flava f. pygmaea Carex flava f. brevirostris Carex foliosa Carex uetliaca Carex flavella Carex viridis Carex patula Carex flava var. alpina Carex flava subsp. alpina Carex flava var. barrerae Carex flava var. brevirostris Carex flava var. congesta Carex flava var. deficiens Carex flava var. densa Carex flava var. dispersa Carex flava var. gaspensis Carex flava var. graminis Carex flava var. intermedia Carex flava var. laxior Carex flava var. pygmaea Carex flava var. rectirostra Carex flava var. rectirostris Carex flava var. vulgaris Carex lepidocarpa var. laxior Carex nevadensis subsp. alpina Carex nevadensis subsp. flavella Carex oederi var. microcarpa Carex flava var. fertilis Carex flava var. uetliaca Carex flava var. patula Carex flava f. graminis Carex flava var. flava Carex flava