Description
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Herbs, annual, cespitose with fibrous roots. Culms trigonous, (2–)6–15(–35) cm × (0.3–)1–1.8 mm, glabrous. Leaves 1–5, flat to V-shaped, (1–)5–15(–22) cm × (0.5–)1.5–3 mm. Inflorescences: spikes ± digitate, ± globose, 7–40 × 10–20 mm; rays (0–)1–6, 2–12 cm; if absent, inflorescence a sessile cluster of (1–)3–10 spikelets; rachis 2–5 mm; bracts (1–)4–5(–6), ascending, V-shaped, 1–15(–20) cm × 0.5–3.5 mm; rachilla persistent, wingless. Spikelets (1–)3–12(–16), greenish white, linear to linear-lanceoloid, compressed-quadrangular, 6–34(–40) × 2–3(–3.6) mm; floral scales deciduous, (8–)16–36(–42), spreading, laterally whitish, greenish, or pale brownish, medially green, weakly 7–9-ribbed, laterally weakly 1–2-ribbed, most ribs medial, ovate, (2.4–)2.6–3 × (1.9–)2–2.4(–2.5) mm, apex acute to ± acute, cuspidate tip (0.3–)0.5–0.7(–0.8) mm. Flowers: anthers 0.6–0.7 mm; styles 0.9–1.3 mm; stigmas 0.5–0.8 mm. Achenes brown, stipitate to sessile, obovoid, (1–)1.2–1.4(–1.5) × 0.9–1(–1.1) mm, apex obtuse to emarginate, surfaces very finely puncticulate.
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Description
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Annual, 3-27 cm, forming small tufts. Stem 0.5-2 mm diam., sharply trigonous, smooth. Leaves from half to slightly shorter than stem; sheaths up to 50 mm, lowest blade-less, greenish grey, yellowish or often slightly brownish, soft, mouth margin wide, slightly concave; blades up to 16 cm, 2.5 mm wide, flat or folded, keeled, margins slightly revolute, smooth, apex acute, scabrous. Inflorescence a simple anthelodium, to 10 cm, or single cluster of spikes, primary branches 0-4, up to 85 mm, tubular prophyll up to 8 mm; lowest 3-5 bracts foliose, 3-20 cm; cluster of spikes 10-20 cm, with 3-9 digitately arranged spikes; spikes 8-20 x c. 4 mm, compressed, ovoid or elongate ellipsoid, green to yellowish brown, glume-like bract c. 2.7 mm, acute, glume-like prophyll c. 1.7 mm, blunt; rachis compressed, c. 0.7 mm wide, narrowly winged, grey, brown-dotted, internodes 0.5-1 mm; glumes c. 4 mm, arista 0.5-0.7 mm, sides with several prominent nerves, grey, brown-dotted, margins scarious. Stamens 2-3; stigmas 3. Nut 1.5-1.7 x c. 1.2 mm, obovoid, plano-convex, rather sharply trigonous, yellowish brown, smooth.
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Distribution
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Distribution: Pantropical, except Australia; extending from India to Afghanistan; in Himalayas up to 1200 m.
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Distribution
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Cosmopolitan.
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Distribution
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Ala., Ark., Del., Fla., Ga., Ill., La., Md., Miss., Mo., N.Y., N.C., Ohio, Pa., S.C., Tex., Va.; Mexico; Central America; South America; Asia; Africa.
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Elevation Range
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600-1200 m
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Flowering/Fruiting
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Fruiting summer–early fall.
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Habitat
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Weed in grasslands, road sides, waste places and fallow rice fields; "prolific monsoon species" (Bhandari, Fl. Ind. Desert: 332. 1990).
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Habitat
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Various disturbed soils; 0–900m.
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Synonym
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Cyperus compressus var. pectiniformis (Roemer & Schultes) C. B. Clarke; C. pectinatus Roxburgh; C. pectiniformis Roemer & Schultes
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Synonym
provided by eFloras
Chlorocyperus compressus Palla, in K. Rech., Denkschr. Math.-Naturw. Kl. Akad. Wiss. 84: 451. 1908; Britton & Brown, Ill. Fl. north. U.S., ed. 2, 1: fig. 729. 1913; K.M. Matthew, Fl. Tamilnadu Carnatic 4: pl. 632. 1988.
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Cyclicity
provided by Plants of Tibet
Flowering and fruiting from July to December.
Distribution
provided by Plants of Tibet
Cyperus compressus is occurring in Anhui, Fujian, Guangdong, Guizhou, Hainan, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Liaoning, Shandong, Shanxi, Sichuan, Taiwan, Yunnan, Zhejiang of China, tropical, subtropical, and warm temperate Africa, America, Asia, and Oceanic Islands.
General Description
provided by Plants of Tibet
Annuals, with fibrous roots. Culms tufted, 5-35 cm tall, slender, triquetrous, smooth, base with leaves. Leaves shorter than culm or sometimes equaling culm; sheath purplish brown; leaf blade 1.5-4 mm wide, flat, sometimes slightly plicate. Bracts 3-5, leaf-shaped, longer than inflorescence. Anthela simple; rays 2-7, 0.8-5 cm, each with 1 spike. Spikes broadly ovate to nearly flabelliform in outline, with 3-10 spikelets; rachis abbreviated. Spikelets densely and nearly digitately arranged, linear-lanceolate, 1-2.5 cm long, 3-4 mm wide, basal ones level spreading and apical ones obliquely spreading, 10-30-flowered; rachilla wings white, narrow, hyaline; scales pale to straw-colored and on both surfaces and sometimes with rust brown striae but middle green, tightly imbricate, ovate, 3-3.5 mm, thinly coriaceous, strongly folded, keeled, veins 9-13, apex acute and with a straight and slightly long mucro. Stamens 3; anthers linear; connective prominent above anther. Style long; stigmas 3, slightly short. Achene dark brown, obovoid, ca. 1/3 as long as scale, trigonous, slightly concave on 3 sides, surface puncticulate.
Genetics
provided by Plants of Tibet
The chromosomal number of Cyperus compressus is 2n = 112, 128 (Bir et al., 1990; Cheema and Bir, 1995).
Habitat
provided by Plants of Tibet
Growing in grasslands, seashore, along trails, lake margins, under forests, stony clefts, wet sandy riverbanks, open fields, rice paddy margins; near sea level to 900 m.
Cyperus compressus
provided by wikipedia EN
Cyperus compressus inflorescence
Cyperus compressus, commonly known as annual sedge, is a sedge of the family Cyperaceae that has a wide distribution throughout countries with warmer climates. It is found in tropical areas of Africa, Asia and the Americas.[2]
In Europe it is commonly known as hedgehog sedge and the French know it as souchet comprimé. In India it is called mothi and in Japan it is known as kugugayatsuri.[2]
Description
The annual sedge typically grows to a height of 0.1 to 0.75 metres (0.3 to 2.5 ft) and has a tufted habit. It blooms between May and December and produces green-yellow-brown flowers.[3] The erect and glabrous grass has fine and numerous roots. It as slender or rigidulous, trigonous stems that are 0.5 to 2.0 millimetres (0.020 to 0.079 in) thick. Red-purple, loose, open leaf sheaths cover the base of the plant with the leaves being much sorter than the stems. The leaves are greyish-green in colour with a narrowly linear shape and a width of 1.5 to 4.0 mm (0.06 to 0.16 in). The inflorescence is composed of umbellate spikes, with three to four rays hat are up to 8 centimetres (3 in) in length.[2] Following flowering it will form a dark brown to black trigonous nut that has a broad-obovoid shape. The nut is about 1.5 mm (0.059 in) in length with a diameter of about 1 mm (0.039 in).[4]
Taxonomy
The species was first described by Carl Linnaeus in 1753 as a part of the work Species Plantarum. It has 11 synonyms including Cyperus brachiatus, Cyperus caffer, Cyperus giraudyi , Cyperus meyenii and Cyperus pectiniformis.[5]
Distribution
It has a wide distribution throughout tropical and sub tropical parts of Asia, especially in India, Malaysia, Pakistan and the Philippines. It is found through much of Africa from Egypt to Zimbabwe. In the Americas it is found in the southern USA, Honduras, Costa Rica and Suriname as well as northern parts of South America. It is also found in Fiji and New Guinea.[5] It is a pantropical species, mostly found in moist places such as irrigated fields, ditches, stream beds, pond margins and lawns. It grows in many soil types usually sandy or alluvial and clay soils.[2]
It has become introduced in many areas, in Western Australia it is found in damp areas in the Kimberley region.[3] It is also found in Queensland, New South Wales and the Northern Territory.[4]
See also
References
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Cyperus compressus: Brief Summary
provided by wikipedia EN
Cyperus compressus inflorescence
Cyperus compressus, commonly known as annual sedge, is a sedge of the family Cyperaceae that has a wide distribution throughout countries with warmer climates. It is found in tropical areas of Africa, Asia and the Americas.
In Europe it is commonly known as hedgehog sedge and the French know it as souchet comprimé. In India it is called mothi and in Japan it is known as kugugayatsuri.
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Cyperus compressus inflorescence 
