Biology
provided by Arkive
This species spreads mainly through vegetative reproduction (3), but flowers are occasionally produced in shallow water exposed to the full sun (2). When covering the entire surface of a pond, it can make the water appear solid, and in parts of the north-west of England children were scared away from such ponds by the myth of Jenny Green-teeth, a pond elf or monster whose presence was indicated by duckweed; she was said to lure children into ponds and drown them (5).
Conservation
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Not relevant.
Description
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This duckweed is one of Britain's most common small water plants, which forms familiar green mats covering stagnant water bodies (4). It has a simple plant body, known as a thallus, which floats on the surface of the water and measures up to five millimetres in diameter (2). A single root hangs down into the water (2).
Habitat
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Found in a wide range of still or slow-flowing water bodies, common duckweed can also occur on mud or damp rocks (3).
Range
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Widespread throughout Britain, but is absent from much of Scotland and Shetland (2). Elsewhere the species has a very wide global distribution, absent only from polar areas and the tropics (2).
Status
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Common and widespread (3).
Threats
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Not currently threatened.
Distribution in Egypt
provided by Bibliotheca Alexandrina LifeDesk
Nile region, oases and Mediterranean region.
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- BA Cultnat
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Global Distribution
provided by Bibliotheca Alexandrina LifeDesk
Cosmopolitan, except Australia.
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- BA Cultnat
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- Bibliotheca Alexandrina
Comments
provided by eFloras
Lemna gibba L. is easily differentiated from Lemna minor L. in being gibbous beneath, and by having larger air spaces.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
provided by eFloras
Fronds free floating, broadly ovate to orbicular, dorsal surface greenish, sometime reddish brown, asymmetrical, slightly convex, 2-7 x 2-4 mm, mostly hemispherical and strongly swollen below with large inflated hyaline cells and air spaces and usually with 40-50 meshes and with 3-5 veins; new fronds budding laterally and remaining attached to very short stipes. Flowering cavity lateral, spathe enclosing 2 staminate and 1 pistillate flower. Fruit 1-5-seeded and winged; seed ribbed, utricle rounded.
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Description
provided by eFloras
Roots to 15 cm, tip mostly rounded; sheath not winged. Stipes white, thin, often decaying. Fronds floating, 1 or 2--5 or more, coherent in groups, obovate, often gibbous, 1--8 mm, 1--1.5 times as long as wide, margins entire; veins (3--)4--5(--7) (all originating from node), greatest distance between lateral veins near or distal to middle; papillae often indistinct; upper lower surface sometimes red colored, coloring beginning from margin, lower upper surface occasionally with distinct red spots beginning from margins near apex; largest air spaces longer than 0.3 mm; distinct turions absent. Flowers: ovaries (1--)2--7-ovulate, utricular scale with narrow opening at apex. Fruits 0.6--1 mm, laterally winged. Seeds with 8--16 distinct ribs, falling out of fruit wall after ripening. 2n = 40, 42, 44, 50.
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Distribution
provided by eFloras
Ariz., Calif., Ill., Nebr., Nev., N.Mex., Tex., Wyo.; northern Mexico; South America; Eurasia; Africa; Atlantic Islands.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Distribution
provided by eFloras
Distribution: Most of Europe, South West Asia, India, Ceylon, NE & South Africa and South America.
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Flower/Fruit
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Fl. Per.: April-August.
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Flowering/Fruiting
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Flowering (rather frequent) spring--fall.
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Habitat
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Eutrophic, quiet waters in temperate regions with mild winters; 0--1900m.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Lemna gibba
provided by wikipedia EN
Lemna gibba, the gibbous duckweed,[1] swollen duckweed,[2] or fat duckweed,[3] is a species of Lemna (duckweed). It has a simple plant body, known as a thallus, which floats on the surface of the water and measures 3–5 mm (0.12–0.20 in) in diameter.[4] A single root hangs down into the water. Found in a wide range of still or slow-flowing water bodies, this common duckweed can also grow on mud or damp rocks.
Distribution
Distribution is in temperate areas in Europe, including Britain, to the Himalayas, Africa, South America, and North America. This duckweed is one of Britain's most common small water plants, which forms familiar green mats covering stagnant water bodies.[5] Widespread throughout Great Britain, but is absent from much of Scotland and Shetland. In Ireland, it is found mainly in the north and east.[6] Elsewhere, the species has a very wide global distribution, absent only from polar areas and the tropics.[7]
Distribution information for this species can be accessed via the Charms of Duckweed (worldwide) and National Biodiversity Network Gateway (Britain only).
This species spreads mainly through vegetative reproduction,[8] but flowers are occasionally produced in shallow water exposed to full sun. When covering the entire surface of a pond, it can make the water appear solid, and in parts of the north-west of England, children were scared away from such ponds by the myth of Jenny Green-teeth, a pond elf or monster whose presence was indicated by duckweed; she was said to lure children into ponds and drown them.[9]
References
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^ Derived from the Latin, gibbus = hump, Merriam-Webster Online Dictionary
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^ USDA, NRCS (n.d.). "Lemna gibba". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 24 January 2016.
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^ BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
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^ Parnell, J. and Curtis, T. 2012. Webb's An Irish Flora. Cork University Press. ISBN 978-185918-4783
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^ Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.
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^ Hackney, P. (Ed)1992. Stewart & Corry's Flora of the North-east of Ireland. Institute of Irish Studies. The Queen's University of Belfast. ISBN 0 85389 446 9 (HB)
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^ Clapham, A.R., Tutin, T.G. and Moore, D.M. (1987) Flora of the British Isles. 3rd Edition. Cambridge University Press, Cambridge.
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^ Preston, C.D., Pearman, D.A. and Dines, T.D. (2002) The New Atlas of the British and Irish Flora. Oxford University Press, Oxford.
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^ Grigson, G. (1996) The Englishman's Flora. Helicon, Oxford.
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Lemna gibba: Brief Summary
provided by wikipedia EN
Lemna gibba, the gibbous duckweed, swollen duckweed, or fat duckweed, is a species of Lemna (duckweed). It has a simple plant body, known as a thallus, which floats on the surface of the water and measures 3–5 mm (0.12–0.20 in) in diameter. A single root hangs down into the water. Found in a wide range of still or slow-flowing water bodies, this common duckweed can also grow on mud or damp rocks.
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