Carex aurea Nutt.

Golden sedge (en)

Species

Angiosperms > Poales > Cyperaceae > Carex

Characteristics

Stems slender, 0.3–4 dm, solitary or in small tufts on long creeping rhizomes; lvs mostly 1–4 mm wide, often surpassing the stems; spikes 2–several, 5–20 mm, approximate or ± remote, erect or loose on slender, sometimes elongate peduncles, the terminal one staminate, less often gynaecandrous, rarely androgynous, the others pistillate, often some of them near-basal; pistillate scales half to fully as long as the perigynia; perigynia ellipsoid to more often obovoid or obovoid-globose, ± rounded and beakless distally, only slightly or not at all compressed, 1.7–3 mm, evidently 12–20-ribbed, varying to nearly nerveless, strongly whitish-papillate on a light green background when young, tending to turn golden or yellow-brown with increasing maturity, becoming somewhat fleshy and obscurely papillate, or sometimes remaining whitish-papillate and not becoming fleshy; stigmas 2 (or 3 in some fls), the achene accordingly lenticular (often plump) or trigonous; 2n=52. Moist or wet places; Nf. to Alas., s. to Pa., n. Ind., Minn., Nebr., N.M. and Calif. (C. garberi and C. hassei, with the perigynia only obscurely nerved and remaining dry and white-papillate at maturity, but the characters confluent)
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Culms 5–40 cm. Leaves: blades 3–20(–30) cm × 1.4–3 mm. Inflorescences: proximal bracts with well-developed blades exceeding inflorescence sheaths 2–4(–10) mm; lateral spikes with 4–20 perigynia, approximate or proximal distant, lax, 4–20(–30) × 3–5 mm, middle internodes (0.5–)0.7–1.5 mm; terminal spike usually staminate, occasionally gynecandrous, sessile or short-pedunculate, 3–10(–15) × 0.9–2 mm. Pistillate scales brown with paler or green midvein, divergent in mature fruit, ovate to ovate-circular, 1.2–2.5 × 1.1–1.8 mm, apex subacute to obtuse or cuspidate. Proximal staminate scales brown with paler or green midvein and hyaline margins, oblong-ovate, 2–3.5(–4) mm, apex obtuse to subacute. Perigynia divergent, bright orange, somewhat inflated and fleshy when mature, circular-obovate, 2.3–3.2 × 1.2–1.8 mm, smooth or minutely papillose. Achenes subcircular, 1.4–1.8 × 1–1.5 mm. 2n = 52.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality -
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.4
Root system fibrous-root rhizome
Rooting depth (meter) 0.2
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Light 5-6
Soil humidity 8-8
Soil texture -
Soil acidity 4-7
Soil nutriment -
Hardiness (USDA) 4-9

Usage

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

Cultivation

Can be grown by cuttings or seedlings.
Mode cuttings seedlings
Germination duration (days) 14 - 28
Germination temperacture (C°) 20
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Fruit

Carex aurea fruit picture by George Annette (cc-by-sa)

Distribution

Carex aurea world distribution map, present in Canada, Colombia, Micronesia (Federated States of), Malaysia, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:298721-1
WFO ID wfo-0000344756
COL ID R87M
BDTFX ID 14291
INPN ID 88807
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Carex aurea Carex mutica Carex pyriformis Neskiza aurea Carex aurea f. colorata