Comments
(
anglais
)
fourni par eFloras
The description is based on N. Indian specimens, which rarely show such compact clusters of spikes as the plants of S India.
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Description
(
anglais
)
fourni par eFloras
Herbs, annual, cespitose. Culms 1–6(–25), trigonous to roundly trigonous, (0.5–)2–5(–9) cm × 0.2–0.4–(0.6) mm, glabrous. Leaves 1–6, V-shaped, 1–6 cm × 0.3–1 mm. Inflorescences: heads digitate, loosely ovoid, 3–18 × 3–26 mm; rays (0–)1–6(–8), 2.5–20(–30) mm; bracts 2–3(–5), horizontal to ascending at 45(–60)°, V-shaped, 2–60 × 0.3–1.2 mm. Spikelets (3–)10–20(–30), greenish to reddish brown, narrowly ellipsoid to oblong, 3–11 × (0.8–)1.2–1.5 mm; floral scales (3–)6–20(–28), laterally greenish to reddish brown, glossy, medially greenish to light reddish brown, strongly recurved, laterally ribless, medially strongly 3-ribbed, oblong-ovate, (0.8–)1–1.3 × 0.8–1(–1.2) mm, apex emarginate, cusp 0.6–1.2 mm. Flowers: stamens 2 or 3; anthers oblong-ovoid, 0.1(–0.2) mm; styles (0.2–)0.4–0.6 mm; stigmas 0.3–0.5 mm. Achenes brown, oblong-obovoid, (0.5–)0.6 × (0.3–)0.4 mm, base cuneate, apex blunt, surfaces coarsely papillose.
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Description
(
anglais
)
fourni par eFloras
Annual, 4-12 cm, forming small tufts. Stem to 0.5 mm diam., obtusely trigonous, smooth. Leaves to as long as stems; sheaths up to 15 mm, yellowish or reddish brown, mouth margin slightly concave; ligule 0; blades up to 80 mm, less than 1 mm wide, margins inrolled, smooth, apex slightly scabrous. Inflorescence a small multiple spike, often reduced to a single cluster of spikes, up to 40 mm; primary branches 0-5, to 35 mm; lowest 2-3 bracts foliose, to 80 x 1.5 mm, spreading. Cluster of spikes 5-20 mm diam., with 4-20 digitately arranged spikes; spikes 2-12 x 2-3 mm, flat, with from 4 to more than 30 glumes; glume-like bract c. 1.5 mm, glume-like prophyll c. 1 mm, scarious, bi-nerved; rachis c. 0.2 mm wide, compressed, 4-angled, reddish brown or greenish, very narrowly winged, often re-branching at axil of prophyll; glumes 1.5-2 mm, truncate, 3-nerved, nerves prominent, ending in a reflexed arista, c. 0.5 mm, mid-nerve area green with some reddish dots, nerve-less sides wide, yellowish or reddish-brown. Stamens 3. Nut c. 0.5 mm, obovoid, trigonous, brown, papillose.
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Distribution
(
anglais
)
fourni par eFloras
Pantropical.
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Distribution
(
anglais
)
fourni par eFloras
Ala., Fla., Ga., S.C.; Mexico; Central America; South America.
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Distribution
(
anglais
)
fourni par eFloras
Distribution: Pantropical; Africa S of Sahara to Namibia and Mozambique, Madagascar, India, Pakistan, China, Taiwan, Malaysia, Australia, S and N America.
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Elevation Range
(
anglais
)
fourni par eFloras
1000-1700 m
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Flower/Fruit
(
anglais
)
fourni par eFloras
Fl. Per.: Oct.-December (Bhandari, l.c. 333. 1990).
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Flowering/Fruiting
(
anglais
)
fourni par eFloras
Fruiting summer.
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Habitat
(
anglais
)
fourni par eFloras
Damp, disturbed soils; 0–300m.
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Habitat
(
anglais
)
fourni par eFloras
Open moist sites, river beds, rice fields.
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Cyperus cuspidatus
(
anglais
)
fourni par wikipedia EN
Cyperus cuspidatus, commonly known as the coastal plain flatsedge,[2] is a sedge of the family Cyperaceae that is native to seasonally dry tropical areas of Africa, Asia, the Americas and Australia.[3][4]
Description
The annual sedge typically grows to a height of 2.5 to 15 centimetres (0.98 to 5.91 in) and has a tufted habit. In Australia it blooms between February and August producing green-yellow-brown flowers.[4] The plant has a slender root system. The glabrous culms are tufted and have a triangular cross-section with length of 1 to 17 cm (0.39 to 6.69 in) and a width of 0.2 to 0.5 mm (0.0079 to 0.0197 in). It has linear shaped leaf blades that can be flat or rolled that taper to a pointed end. The leaves are 1 to 13.5 cm (0.39 to 5.31 in) in length and have a width of 0.2 to 1.1 cm (0.079 to 0.433 in). the leaves are accompanied by red-brown to purple coloured sheaths of a similar length and width.[5]
Taxonomy
The species was described by the botanist Carl Sigismund Kunth in 1816 as a part of the work Nova genera et species plantarum authored by Kunth, Aimé Bonpland and Alexander von Humboldt. It has a total of 18 synonyms including; Cyperus angustifolius, Cyperus gratus, Cyperus recurvus, Cyperus waterlotii and Dichostylis cuspidata.[3] The type specimen was collected by von Humboldt and Bonpland in Venezuela in 1800.[6]
Distribution
In Australia it is found in Queensland, the Northern Territory and it is found along creeks, streams and rivers in the Kimberley region of Western Australia where it grows in stony red sand-loam soils over sandstone.[4] In Asia it is found from Pakistan in the west to China in the east and extends down into Malesia. It is found in southern parts of North America extending through Central America and in northern parts of South America.[3]
See also
References
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Cyperus cuspidatus: Brief Summary
(
anglais
)
fourni par wikipedia EN
Cyperus cuspidatus, commonly known as the coastal plain flatsedge, is a sedge of the family Cyperaceae that is native to seasonally dry tropical areas of Africa, Asia, the Americas and Australia.
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