Clover

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Clover
Trifolium April 2010-2.jpg
Trifolium sp. (clover)
Scientific classification
Kingdom:Plantae
(unranked):Angiosperms
(unranked):Eudicots
(unranked):Rosids
Order:Fabales
Family:Fabaceae
Subfamily:Faboideae
Tribe:Trifolieae
Genus:Trifolium
L.
Subgenera and Sections[1][2]

subg. Chronosemium
subg. Trifolium

sect. Glycyrrhizum
sect. Involucrarium
sect. Lupinaster
sect. Paramesus
sect. Trichocephalum
sect. Trifoliastrum
sect. Trifolium
sect. Vesicastrum
Synonyms

Amoria C. Presl[3]
Bobrovia A. P. Khokhr.[3]
Chrysaspis Desv.[3]
Lupinaster Fabr.[3]
Ursia Vassilcz.[3]
Xerosphaera Soják[3]

 
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"Alsike" and "Trifolium" redirect here. For the Swedish locality, see Alsike, Sweden. For the Canadian locality, see Alsike, Alberta. For the trematode parasite, see Cladocystis trifolium.
For the mobile dating application, see Clover (application).
For other uses, see Clover (disambiguation).
Clover
Trifolium April 2010-2.jpg
Trifolium sp. (clover)
Scientific classification
Kingdom:Plantae
(unranked):Angiosperms
(unranked):Eudicots
(unranked):Rosids
Order:Fabales
Family:Fabaceae
Subfamily:Faboideae
Tribe:Trifolieae
Genus:Trifolium
L.
Subgenera and Sections[1][2]

subg. Chronosemium
subg. Trifolium

sect. Glycyrrhizum
sect. Involucrarium
sect. Lupinaster
sect. Paramesus
sect. Trichocephalum
sect. Trifoliastrum
sect. Trifolium
sect. Vesicastrum
Synonyms

Amoria C. Presl[3]
Bobrovia A. P. Khokhr.[3]
Chrysaspis Desv.[3]
Lupinaster Fabr.[3]
Ursia Vassilcz.[3]
Xerosphaera Soják[3]

Clover (Trifolium), or trefoil, is a genus of about 300 species of plants in the leguminous pea family Fabaceae. The genus has a cosmopolitan distribution; the highest diversity is found in the temperate Northern Hemisphere, but many species also occur in South America and Africa, including at high altitudes on mountains in the tropics. They are small annual, biennial, or short-lived perennial herbaceous plants. The leaves are trifoliate (rarely 5- or 7-foliate), with stipules adnate to the leaf-stalk, and heads or dense spikes of small red, purple, white, or yellow flowers; the small, few-seeded pods are enclosed in the calyx. Other closely related genera often called clovers include Melilotus (sweet clover) and Medicago (alfalfa or 'calvary clover'). The "shamrock" of popular iconography is sometimes considered to be young clover. The scientific name derives from the Latin tres, "three", and folium, "leaf", so called from the characteristic form of the leaf, which has three leaflets (trifoliate); hence the popular name trefoil. Clovers are used as food plants by the larvae of some Lepidoptera (butterfly and moth) species; see list of Lepidoptera that feed on clovers.

Cultivation[edit]

Several species are extensively cultivated as fodder plants. The most widely cultivated clovers are white clover Trifolium repens and red clover Trifolium pratense. Clover, either sown alone or in mixture with ryegrass, has for a long time formed a staple crop for soiling, for several reasons: it grows freely, shooting up again after repeated mowings; it produces an abundant crop; it is palatable to and nutritious for livestock; it fixes nitrogen, reducing the need for synthetic fertilizers; it grows in a great range of soils and climates; and it is appropriate for either pasturage or green composting.

In many areas, particularly on acidic soil, clover is short-lived because of a combination of insect pests, diseases and nutrient balance; this is known as "clover sickness". When crop rotations are managed so that clover does not recur at intervals shorter than eight years, it grows with much of its pristine vigor.

Clover sickness in more recent times may also be linked to pollinator decline; clovers are most efficiently pollinated by bumblebees, which have declined as a result of agricultural intensification.[4] Honeybees can also pollinate clover, and beekeepers are often in heavy demand from farmers with clover pastures. Farmers reap the benefits of increased reseeding that occurs with increased bee activity, which means that future clover yields remain abundant. Beekeepers benefit from the clover bloom, as clover is one of the main nectar sources for honeybees.

T. repens, white or Dutch clover, is a perennial abundant in meadows and good pastures. The flowers are white or pinkish, becoming brown and deflexed as the corolla fades. T. hybridum, alsike or Swedish clover, is a perennial which was introduced early in the 19th century and has now become naturalized in Britain. The flowers are white or rosy, and resemble those of the last species. T. medium, meadow or zigzag clover, a perennial with straggling flexuous stems and rose-purple flowers, is of little or no agricultural value.

Other South African species are: T. arvense, hare's-foot trefoil; found in fields and dry pastures, a soft hairy plant with minute white or pale pink flowers and feathery sepals; T. fragiferum, orange clover, with hot-grounded, globose, rose-purple heads and swollen calyxes; T. procumbens, hop trefoil, on dry pastures and roadsides, the heads of pale yellow flowers suggesting miniature hops; and the somewhat similar T. minus, common in pastures and roadsides, with smaller heads and small yellow flowers turning dark brown.

Symbolism[edit]

Shamrock, the traditional Irish symbol, which according to legend was coined by Saint Patrick for the Holy Trinity, is commonly associated with clover, though sometimes with Oxalis species, which are also trifoliate (i.e., they have three leaves).

Clovers occasionally have leaves with four leaflets, instead of the usual three. These four-leaf clovers, like other rarities, are considered lucky. Clovers can also have five, six, or more leaves, but these are rarer. The record for most leaves is 56, set on 10 May 2009.[5] This beat the 21-leaf clover,[6] a record set in June 2008 by the same man, who had also held the prior record Guinness World Record of 18.[7]

A common idiom is "to be (live) in clover", meaning to live a carefree life of ease, comfort, or prosperity. This originally referred to the fact that clover is fattening to cattle.[8]

The cloverleaf interchange is named for the resemblance to the leaves of a (four-leafed) clover when viewed from the air.

Selected species[edit]

The genus Trifolium currently has 245 recognized species:[1]

  • Trifolium acaule A. Rich.
  • Trifolium affine C. Presl
  • Trifolium africanum Ser.
  • Trifolium aintabense Boiss. & Hausskn.
  • Trifolium albopurpureum Torr. & A. Gray
  • Trifolium alexandrinum L.
  • Trifolium alpestre L.
  • Trifolium alpinum L.
  • Trifolium amabile Kunth
  • Trifolium ambiguum M. Bieb.
  • Trifolium amoenum Greene, Showy Indian Clover
  • Trifolium andersonii A. Gray
  • Trifolium andinum Nutt.
  • Trifolium andricum Lassen
  • Trifolium angulatum Waldst. & Kit.
  • Trifolium angustifolium L.
  • Trifolium apertum Bobrov
  • Trifolium argutum Banks & Sol.
  • Trifolium arvense L., Hare's-foot clover
  • Trifolium attenuatum Greene
  • Trifolium aureum Pollich, Large Hop Trefoil
  • Trifolium baccarinii Chiov.
  • Trifolium badium Schreb.
  • Trifolium barbeyi Gibelli & Belli
  • Trifolium barbigerum Torr.
  • Trifolium barnebyi (Isely) Dorn & Lichvar
  • Trifolium batmanicum Katzn.
  • Trifolium beckwithii W. H. Brewer ex S. Watson
  • Trifolium bejariense Moric.
  • Trifolium berytheum Boiss. & Blanche
  • Trifolium bifidum A. Gray
  • Trifolium bilineatum Fresen.
  • Trifolium billardierei Spreng.
  • Trifolium bivonae Guss.
  • Trifolium blancheanum Boiss.
  • Trifolium bocconei Savi
  • Trifolium boissieri Guss. ex Soy.-Will. & Godr.
  • Trifolium bolanderi A. Gray
  • Trifolium brandegeei S. Watson
  • Trifolium breweri S. Watson
  • Trifolium brutium Ten.
  • Trifolium buckwestiorum Isely
  • Trifolium bullatum Boiss. & Hausskn.
  • Trifolium burchellianum Ser.
  • Trifolium calcaricum J. L. Collins & Wieboldt
  • Trifolium calocephalum Fresen.
  • Trifolium campestre Schreb., Hop Trefoil
  • Trifolium canescens Willd.
  • Trifolium carolinianum Michx.
  • Trifolium caucasicum Tausch
  • Trifolium caudatum Boiss.
  • Trifolium cernuum Brot.
  • Trifolium cheranganiense J. B. Gillett
  • Trifolium cherleri L.
  • Trifolium chilaloense Thulin
  • Trifolium chilense Hook. & Arn.
  • Trifolium chlorotrichum Boiss. & Balansa
  • Trifolium ciliolatum Benth.
  • Trifolium cinctum DC.
  • Trifolium clusii Godr. & Gren.
  • Trifolium clypeatum L.
  • Trifolium congestum Guss.
  • Trifolium constantinopolitanum Ser.
  • Trifolium cryptopodium Steud. ex A. Rich.
  • Trifolium cyathiferum Lindl., Cup clover
  • Trifolium dalmaticum Vis.
  • Trifolium dasyphyllum Torr. & A. Gray
  • Trifolium dasyurum C. Presl
  • Trifolium davisii M. Hossain
  • Trifolium decorum Chiov.
  • Trifolium depauperatum Desv.
  • Trifolium dichotomum Hook. & Arn.
  • Trifolium dichroanthoides Rech. f.
  • Trifolium dichroanthum Boiss.
  • Trifolium diffusum Ehrh.
  • Trifolium dolopium Heldr. & Hausskn. ex Gibelli & Belli
  • Trifolium douglasii House
  • Trifolium dubium Sibth., Lesser Hop Trefoil
  • Trifolium echinatum M. Bieb.
  • Trifolium elgonense J. B. Gillett
  • Trifolium eriocephalum Nutt.
  • Trifolium eriosphaerum Boiss.
  • Trifolium erubescens Fenzl
  • Trifolium euxinum Zohary
  • Trifolium eximium Stephan ex Ser.
  • Trifolium fragiferum L.
  • Trifolium friscanum (S.L. Welsh) S.L. Welsh
  • Trifolium fucatum Lindl.
  • Trifolium gemellum Pourr. ex Willd.
  • Trifolium gillettianum Jacq.-Fél.
  • Trifolium glanduliferum Boiss.
  • Trifolium globosum L.
  • Trifolium glomeratum L.
  • Trifolium gordejevii (Kom.) Z. Wei
  • Trifolium gracilentum Torr. & A. Gray
  • Trifolium grandiflorum Schreb.
  • Trifolium gymnocarpon Nutt.
  • Trifolium haussknechtii Boiss.
  • Trifolium haydenii Porter
  • Trifolium heldreichianum (Gibelli & Belli) Hausskn.
  • Trifolium hirtum All.
  • Trifolium howellii S. Watson
  • Trifolium hybridum L., Alsike Clover
  • Trifolium incarnatum L., Crimson Clover
  • Trifolium israeliticum Zohary & Katzn.
  • Trifolium isthmocarpum Brot.
  • Trifolium jokerstii Vincent & Rand. Morgan
  • Trifolium juliani Batt.
  • Trifolium kingii S. Watson
  • Trifolium lanceolatum (J. B. Gillett) J. B. Gillett
  • Trifolium lappaceum L.
  • Trifolium latifolium (Hook.) Greene
  • Trifolium latinum Sebast.
  • Trifolium leibergii A. Nelson & J. F. Macbr.
  • Trifolium lemmonii S. Watson
  • Trifolium leucanthum M. Bieb.
  • Trifolium ligusticum Balb. ex Loisel.
  • Trifolium longidentatum Nábelek
  • Trifolium longipes Nutt.
  • Trifolium lucanicum Gasp. ex Guss.
  • Trifolium lugardii Bullock
  • Trifolium lupinaster L.
  • Trifolium macilentum Greene
  • Trifolium macraei Hook. & Arn.
  • Trifolium macrocephalum (Pursh) Poir.
  • Trifolium masaiense J. B. Gillett
  • Trifolium mattirolianum Chiov.
  • Trifolium mazanderanicum Rech. f.
  • Trifolium medium L.
  • Trifolium meduseum Blanche ex Boiss.
  • Trifolium meironense Zohary & Lerner
  • Trifolium michelianum Savi.
  • Trifolium micranthum Viv.
  • Trifolium microcephalum Pursh
  • Trifolium microdon Hook. & Arn.
  • Trifolium miegeanum Maire
  • Trifolium monanthum A. Gray
  • Trifolium montanum L.
  • Trifolium mucronatum Willd. ex Spreng.
  • Trifolium multinerve A. Rich.
  • Trifolium mutabile Port.
  • Trifolium nanum Torr.
  • Trifolium neurophyllum Greene
  • Trifolium nigrescens Viv.
  • Trifolium noricum Wulfen
  • Trifolium obscurum Savi
  • Trifolium obtusiflorum Hook. & Arn.
  • Trifolium ochroleucum Huds.
  • Trifolium oliganthum Steud.
  • Trifolium ornithopodioides L.
  • Trifolium owyheense Gilkey
  • Trifolium pachycalyx Zohary
  • Trifolium palaestinum Boiss.
  • Trifolium pallescens Schreb.
  • Trifolium pallidum Waldst. & Kit.
  • Trifolium pannonicum Jacq.
  • Trifolium parnassi Boiss. & Spruner
  • Trifolium parryi A. Gray
  • Trifolium patens Schreb.
  • Trifolium patulum Tausch
  • Trifolium pauciflorum d'Urv.
  • Trifolium petitianum A. Rich.
  • Trifolium philistaeum Zohary
  • Trifolium phitosianum N. Böhling et al.
  • Trifolium phleoides Pourr. ex Willd.
  • Trifolium physanthum Hook. & Arn.
  • Trifolium physodes Steven ex M. Bieb.
  • Trifolium pichisermollii J. B. Gillett
  • Trifolium pignantii Brongn. & Bory
  • Trifolium pilczii Adamović
  • Trifolium pilulare Boiss.
  • Trifolium pinetorum Greene
  • Trifolium plebeium Boiss.
  • Trifolium plumosum Douglas
  • Trifolium polymorphum Poir.
  • Trifolium polyodon Greene
  • Trifolium polyphyllum C. A. Mey.
  • Trifolium polystachyum Fresen.
  • Trifolium praetermissum Greuter et al.
  • Trifolium pratense L., Red clover
  • Trifolium prophetarum M. Hossain
  • Trifolium pseudostriatum Baker f.
  • Trifolium purpureum Loisel.
  • Trifolium purseglovei J. B. Gillett
  • Trifolium quartinianum A. Rich.
  • Trifolium radicosum Boiss. & Hohen.
  • Trifolium reflexum L.
  • Trifolium repens L., Shamrock (white clover)
  • Trifolium resupinatum L.
  • Trifolium retusum L.
  • Trifolium riograndense Burkart
  • Trifolium roussaeanum Boiss.
  • Trifolium rubens L.
  • Trifolium rueppellianum Fresen.
  • Trifolium salmoneum Mouterde
  • Trifolium saxatile All.
  • Trifolium scabrum L.
  • Trifolium schimperi A. Rich.
  • Trifolium scutatum Boiss.
  • Trifolium sebastianii Savi
  • Trifolium semipilosum Fresen.
  • Trifolium setiferum Boiss.
  • Trifolium simense Fresen.
  • Trifolium sintenisii Freyn
  • Trifolium siskiyouense J. M. Gillett
  • Trifolium somalense Taub.
  • Trifolium spadiceum L.
  • Trifolium spananthum Thulin
  • Trifolium spumosum L.
  • Trifolium squamosum L.
  • Trifolium squarrosum L.
  • Trifolium stellatum L.
  • Trifolium steudneri Schweinf.
  • Trifolium stipulaceum Thunb.
  • Trifolium stoloniferum Muhl. ex A. Eaton, Running Buffalo Clover
  • Trifolium stolzii Harms
  • Trifolium striatum L.
  • Trifolium strictum L.
  • Trifolium subterraneum L., Subterranean clover
  • Trifolium suffocatum L.
  • Trifolium sylvaticum Gérard ex Loisel.
  • Trifolium tembense Fresen.
  • Trifolium thalii Vill.
  • Trifolium thompsonii C. V. Morton
  • Trifolium tomentosum L.
  • Trifolium triaristatum Bertero ex Colla
  • Trifolium trichocalyx A. Heller
  • Trifolium trichocephalum M. Bieb.
  • Trifolium trichopterum Pančić
  • Trifolium tumens Steven ex M. Bieb.
  • Trifolium ukingense Harms
  • Trifolium uniflorum L.
  • Trifolium usambarense Taub.
  • Trifolium variegatum Nutt.
  • Trifolium vavilovii Eig
  • Trifolium velebiticum Degen
  • Trifolium velenovskyi Vandas
  • Trifolium vernum Phil.
  • Trifolium vesiculosum Savi
  • Trifolium vestitum D. Heller & Zohary
  • Trifolium virginicum Small
  • Trifolium wentzelianum Harms
  • Trifolium wettsteinii Dörfl. & Hayek
  • Trifolium wigginsii J. M. Gillett
  • Trifolium willdenovii Spreng., Tomcat clover
  • Trifolium wormskioldii Lehm., Cow clover

See also[edit]

References[edit]

  1. ^ a b "Species Nomenclature in GRIN". Retrieved 2010-08-04. 
  2. ^ [1]
  3. ^ a b c d e f "Genus Nomenclature in GRIN". Retrieved 2010-07-09. 
  4. ^ Bumbles make beeline for gardens, study suggests Retrieved 27 November 2010.
  5. ^ "Most Leaves on a Clover". Guinness World Records. 2011. Retrieved 23 April 2011. 
  6. ^ 21-leaf Clover Sets Record. Neatorama. Retrieved 7 December 2008.
  7. ^ Clover - Most Leaves. Guinness World Record. Retrieved 7 December 2008. (illustrating a stem with eighteen leaflets discovered in Hanamaki City, Japan, in May 2002)
  8. ^ Oxford English Dictionary, s.v. "clover", Online Etymology Dictionary, s.v. "clover".

External links[edit]