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Species
Cyperus iria L. (1753)
IUCN
NCBI
EOL Text
Annual, 20-70 cm, solitary or forming small tussocks. Rhizome small. Stem 2-3 mm diam., trigonous, smooth. Leaves up to equalling stem; sheaths to 20 cm, soft, yellow brown, sometimes with reddish tint, finely brown-dotted, mouth margin straight; ligule 0; blades to more than 30 cm, 2-5 mm wide, flat, keeled, green or greyish green, margins slightly revolute, margins and keel towards the apex scabrous, apex acute, scabrous. Inflorescence a compound anthelodium, 5-20 cm; 4-6 bracts foliose, to more than 25 cm, much longer than inflorescence; primary branches up to 15 cm, rigid; secondary anthelodium 20-50 mm; tertiary anthelodium 20-30 mm; cluster of spikes 10-40 mm, spikate, erect, lax, with c. 40 spikes; spikes 3.5-5 x c. 2 mm, compressed, lax, with 5-20 flowers, glume-like bract c. 1 mm, glume-like prophyll scarious, bi-nerved; rachis c. 0.4 mm wide, 4-angled, flat, brown, narrowly winged, internodes c. 0.6 mm; glumes c. 1.5 mm, cymbiform, keeled, mucronate, sides nerveless, yellow-brown, shiny, margins scarious. Stamens 2; stigmas 3. Nut c. 1.2 x 0.6 mm, rather sharply trigonous, ellipsoid, brown or dark brown, finely papillose.
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Rounded Global Status Rank: GNR - Not Yet Ranked
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| Rights holder/Author | NatureServe |
| Source | http://explorer.natureserve.org/servlet/NatureServe?searchName=Cyperus+iria |
Herbs, annual, cespitose. Culms trigonous, (5–)20–60 cm × (0.2–) 0.6–2.4 mm, glabrous. Leaves (1–)3–4, V-shaped, 15–40 cm × 3–6 mm. Inflorescences: spikes 2–5(–8), oblong to ovoid, 2–10 cm × 3–12 mm; rays 4–8, to 11 cm; bracts (4–)5(–7), ascending at 45°, V-shaped, (1.5–)8–30(–50) cm × 1–6 mm; rachilla persistent, wingless (successive floral scales 0.7–0.9 mm apart). Spikelets 10–30, compressed, linear to ellipsoid, 4–20 × 1.5–2.1 mm; floral scales deciduous, (2–)6–26, laterally brown to golden brown, edges clear, medially green, 5-ribbed, outermost ribs more noticeable than others, obovate to nearly orbiculate, 1.3–1.8 × 1.2–1.8 mm, margins emarginate, apex with mucro 0.05–0.12 mm. Flowers: stamens 2(–3); anthers (0.2–)0.3–0.4 mm, connective tips reddish, less than 0.1 mm; styles less than 0.1 mm; stigmas 0.2–0.4 mm. Achenes brown, slightly stipitate, obovoid, 1.2–1.4 × 0.5–0.7 mm, apex apiculate, surfaces puncticulate.
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| Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
| Source | http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200026694 |
Population
Population Trend
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| Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
| Source | http://www.iucnredlist.org/apps/redlist/details/169017 |
"Erect, not tufted, non-rhizomatous annuals; culms 12-50 cm tall, triquetrous. Leaves few, basal, 10-50 x 3-6 mm, linear, flat, gradually acuminate, scabrous on upper margins; sheaths 1-3 cm long, purplish-brown. Inflorescence compound, 8-15 cm across, diffuse, branches spicate; leafy bracts 3-5, the longest upto 35 cm long. Spikelets 4-5 x 1.5-2 mm, linear-oblong, bearing 6-10 florets, yellowish. Glumes distant, 1-1.5 x 1-15 mm, obovate-orbicular, apex rounded or emarginate, keeled, yellowish, margins white-hyaline. Stamens 2-3. Stigmas 3. Nut 1-1.5 x c. 0.5 mm, obovate, triquetrous, stipitate, brown."
Major Threats
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| Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
| Source | http://www.iucnredlist.org/apps/redlist/details/169017 |
Chlorocyperus iria (L.) Rikli, Jahrb. Wiss. Bot. 27: 564. 1895; Holm & al., World's worst weeds: fig. 95. 1977; K.M. Matthew, Fl. Tamilnadu Carnatic 4: pl.640. 1988.
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| Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
| Source | http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=200026694 |
Conservation Actions
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| Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
| Source | http://www.iucnredlist.org/apps/redlist/details/169017 |
Isotype for Cyperus resinosus Hochst. ex Steud.
Catalog Number: US 3648031
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): K. G. Kotschy
Year Collected: 1839
Locality: "Nubia", ad aquarium orientale urbis Cordofanae Obeid, Kurdufan, Sudan, Africa
- Isotype: Steudel, E. G. von. 1854. Syn. Pl. Glumac. 2: 23.
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| Rights holder/Author | This image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws. |
| Source | http://collections.mnh.si.edu/search/botany/?irn=10575080 |
Cyperus iria (also known as rice flat sedge and rice flatsedge) is a smooth, tufted sedge found worldwide. The roots are yellowish-red and fibrous.[2][3] The plant often grows in rice paddies, where it is considered to be a weed.[4]
References[edit]
- ^ "Cyperus iria". Integrated Taxonomic Information System.
- ^ International Rice Research Institute (1983). "Field problems of tropical rice", revised, p. 121. Int. Rice Res. Inst. ISBN 971-10-4080-8, ISBN 978-971-10-4080-2
- ^ Marita Ignacio Galinato, Keith Moody, Colin M. Piggin (1999). "Upland rice weeds of south and southeast Asia", p. 39, Int. Rice Res. Inst. ISBN 971-22-0130-9, ISBN 978-971-22-0130-1
- ^ Cyperus iria L. - CYPERACEAE - Monocotyledon
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| Source | http://en.wikipedia.org/w/index.php?title=Cyperus_iria&oldid=580570735 |