Cyperus amuricus Maxim.

Asian flatsedge (en)

Species

Angiosperms > Poales > Cyperaceae > Cyperus

Characteristics

Annuals. Roots fibrous. Culms tufted, 10-60 cm tall, slender, compressed triquetrous, smooth, base with several leaves. Leaves shorter than culm; leaf blade 2-5 mm wide, flat, scabrid on apical margin and smooth on other parts. Involucral bracts 3-5, leaflike, basal 2 usually longer than inflorescence. Inflorescence a simple anthela; rays 4-10, mostly to 12 cm, each with 1 spike. Spike broadly ovoid to oblong, 1-3 × 0.8-3 cm, with several to many spikelets. Spikelets laxly arranged, linear to narrowly linear-ovoid, 0.5-1.5 cm × 1-2 mm, obliquely spreading but spreading after anthesis, 8-20-flowered; rachilla wings white, narrow, hyaline, persistent; successive glumes on rachilla ca. 0.5 mm apart. Glumes purplish red to brown on both surfaces but middle green, slightly lax, broadly obovate to suborbicular, 1-1.5 mm, membranous, slightly shiny, 5-veined, midvein forming a keel, apex with an excurved mucro ca. 0.4 mm. Stamens 3; anthers ellipsoid, 0.2-0.4 mm; connective prominent beyond anthers. Style very short; stigmas 3, ± short. Nutlet blackish brown, obovoid to oblong, nearly as long as subtending glume, 3-sided, densely prominently puncticulate, apex mucronate. Fl. and fr. Jul-Oct.
Life form annual
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.1 - 0.6
Root system fibrous-root
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months -
Fruit color -
Fruiting months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light 4-9
Soil humidity 7-9
Soil texture 1-2
Soil acidity -
Soil nutriment -
Hardiness (USDA) 4-10

Usage

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

Cultivation

Mode -
Germination duration (days) 25 - 30
Germination temperacture (C°) 21 - 23
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Distribution

Cyperus amuricus world distribution map, present in China, Japan, Malaysia, Korea (Democratic People's Republic of), Taiwan, Province of China, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:303755-1
WFO ID wfo-0000367678
COL ID 33BK5
BDTFX ID 77707
INPN ID 161523
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Chlorocyperus amuricus Cyperus amuricus Cyperus pterygorrachis Chlorocyperus franchetii Cyperus krameri Cyperus amuricus f. nanus Cyperus japonicus Cyperus amuricus var. subivioides Cyperus aristatus var. maingayi Cyperus amuricus var. pterygorrachis Cyperus amuricus f. perdebilis Cyperus amuricus var. japonicus