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|image_caption=Orange blossoms and oranges on tree
 
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An '''orange'''—specifically, the '''sweet orange'''—is the [[citrus]] fruit ''Citrus sinensis'' ([[Synonymy|syn.]] ''Citrus aurantium'' [[Carl Linnaeus|L.]] [[var.]] ''dulcis'' [[Carl Linnaeus|L.]], or ''Citrus aurantium'' [[Antoine Risso|Risso]]) and its [[fruit]]. The orange is a [[Hybrid (biology)|hybrid]] of ancient cultivated origin, possibly between [[pomelo]] (''Citrus maxima'') and [[tangerine]] (''Citrus reticulata''). It is a small [[Flowering plant| flowering]] [[tree]] growing to about 10 [[metres|m]] tall with [[evergreen]] [[leaf|leaves]], which are arranged alternately, of ovate shape with crenulate margins and 4–10 [[centimetre|cm]] long. The orange [[fruit]] is a [[hesperidium]], a type of [[berry]].
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Oranges originated in Southeast [[Asia]].  The fruit of ''Citrus sinensis'' is called ''sweet orange'' to distinguish it from ''Citrus aurantium'', the [[bitter orange]].  In a number of languages, it is known as a "Chinese apple" (e.g. [[Dutch language|Dutch]] ''Sinaasappel'', "China's apple", or "Apfelsine" in German).  The name is thought to ultimately derive from the [[Dravidian languages|Dravidian]] word for the orange tree, with its final form developing after passing through numerous intermediate languages.
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==Fruit==
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All citrus trees are of the single genus ''Citrus'', and remain largely interbreedable; that is, there is only one "superspecies" which includes [[grapefruit]]s, [[lemon]]s, [[lime (fruit)|lime]]s and oranges.  Nevertheless, names have been given to the various members of the genus, oranges often being referred to as ''Citrus sinensis'' and ''[[bitter orange|Citrus aurantium]]''. Fruits of all members of the genus ''Citrus'' are considered [[berry|berries]] because they have many [[seed]]s, are fleshy and soft, and derive from a single [[ovary (plants)|ovary]]. An orange seed is called a [[pip]]. The white thread-like material, attached to the inside of the peel is called [[pith]].
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==Varieties==
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===Persian orange===
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The Persian orange, grown widely in [[southern Europe]] after its introduction to [[Italy]] in the 11th century, was bitter. Sweet oranges brought to Europe in the 15th century from [[India]] by [[Portugal|Portuguese]] traders, quickly displaced the bitter, and are now the most common variety of orange cultivated. The sweet orange will grow to different sizes and colours according to local conditions, most commonly with ten ''[[carpel]]s'', or segments, inside.
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Some South East European tongues name [[Orange (fruit)|orange]] after Portugal, which was formerly the main source of imports of sweet oranges. Examples are [[Bulgarian language|Bulgarian]] ''portokal'' [портокал], [[Modern Greek|Greek]] ''portokali'' [πορτοκάλι], [[Romanian language|Romanian]] ''portocală'' and [[Georgian language|Georgian]] ''phortokhali'' [ფორთოხალი]. Also in [[Italian dialects|South Italian dialects]] ([[Neapolitan language|Neapolitan]]), orange is named ''portogallo'' or ''purtualle'', literally "the Portuguese ones". Related names can also be found in non-European languages: [[Turkish language|Turkish]] ''Portakal'', [[Arabic language|Arabic]] ''al-burtuqal'' [البرتقال], [[Persian language|Persian]] ''porteghal'' [پرتقال] and [[Amharic]] ''birtukan''.
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[[Portuguese empire|Portuguese]], [[Spanish empire|Spanish]], [[Arab empire|Arab]], and [[Dutch empire|Dutch]] sailors planted citrus trees along trade routes to prevent [[scurvy]]. On his second voyage in [[1493]], Christopher Columbus brought the seeds of oranges, lemons and citrons to [[Haiti]] and the Caribbean. They were introduced in Florida (along with lemons) in [[1513]] by [[Spain|Spanish]] explorer [[Juan Ponce de Leon]], and were introduced to [[Hawaii]] in [[1792]].
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===Navel orange===
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[[Image:Navel orange sectioned.jpg|thumb|250px|left|A peeled sectioned navel orange. The underdeveloped twin is located on the bottom right.]]
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A single [[mutation]] in [[1820]] in an [[orchard]] of sweet oranges planted at a [[monastery]] in [[Brazil]] yielded the '''navel orange''', also known as the Washington, Riverside, or Bahie navel. The mutation causes navel oranges to develop a second orange at the base of the original fruit, opposite the stem. The second orange develops as a [[Conjoined twins|conjoined twin]] in a set of smaller segments embedded within the peel of the larger orange. From the outside, the smaller, and undeveloped twin leaves a formation at the bottom of the fruit that looks similar to the human [[navel]].
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Because the mutation left the fruit seedless and, therefore, sterile, the only means available to cultivate more of this new variety is to graft cuttings onto other varieties of citrus tree. Two such cuttings of the original tree were transplanted<ref>[http://thegoldengecko.com/blog/?p=34 Parent Navel Orange Tree in Riverside, CA]</ref> to [[Riverside, California|Riverside]], [[California]] in [[1870]], which eventually led to worldwide popularity.
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Today, navel oranges continue to be produced via [[cutting (plant)|cutting]] and [[grafting]]. This does not allow for the usual [[artificial selection|selective breeding]] methodologies, and so not only do the navel oranges of today have exactly the same genetic makeup as the original tree, and are therefore [[clones]]; in a sense, all navel oranges can be considered to be the fruit of that single, over a century-old tree.
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On rare occasions, however, further mutations can lead to new varieties.<ref>[http://www.citrusvariety.ucr.edu/citrus/sweet_oranges.html Citrus Variety Collection]</ref>
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===Valencia orange===
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The [[Valencia orange|Valencia]] or [[Murcia]] orange is one of the sweet oranges used for juice extraction. It is a late-season fruit, and therefore a popular variety when the navel oranges are out of season. For this reason, the orange was chosen to be the official [[mascot]] of the [[1982 FIFA World Cup]], which was held in [[Spain]]. The mascot was called "[[Naranjito]]" ("little orange"), and wore the colours of the Spanish soccer team uniform.
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===Blood orange===
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[[Image:2005orange.PNG|thumb|right|Orange output in 2005]]
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The [[blood orange]] has streaks of red in the fruit, and the juice is often a dark burgundy colour. The fruit has found a niche as an interesting ingredient variation on traditional Seville marmalade, with its striking red streaks and distinct flavour. The '''scarlet navel''' is a variety with the same diploid mutation as the navel orange.
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==Cultivation==
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==Propagation==
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Grafting, cuttings for true offspring.  Seed.
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==Pests and diseases==
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==Uses==
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Fruit, juice, marmelade. Oil from peel. Orange peel is used by gardeners as a [[slug]] repellent. Orange leaves can be boiled to make tea.
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==Gallery==
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<gallery>
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Image:Ambersweet oranges.jpg|These varieties are called 'Ambersweet' oranges.
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Image:Orangeseeds.jpg|Featured here are orange seeds (pips).
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Image:Florida navel orange 1.jpg|Navel oranges from Florida are the most common to be sold in US grocery stores.
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Image:2007-12-25-IMG 0451.JPG|Satsuma Oranges picked on Christmas day 2007 in [[Gainesville, Florida]]
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</gallery>
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==Standard Cyclopedia of Horticulture==
 
{{Inc|
 
{{Inc|
 
Orange. Plate LXXVIII. The orange is one of the oldest of cultivated fruits. Its nativity is still in doubt, but it is probable that it is indigenous to the Indo- Chinese region. It is now widely distributed in all warm- temperate and tropical countries, in many of which it has run wild and behaves like a native plant. In parts of Florida the orange was found wild when permanent settlements were made, but it had probably spread from stock that was introduced by the early Spaniards. In stature of tree and character of fruit, the orange has varied immensely. Normally, the fruit contains ten compartments or locules; but under the influence of domestication these compartments have been increased, and in some cases a secondary axis, with its accompanying locules, has been thrust into the center of the fruit, causing the "navel" appearance of some varieties (Figs. 2611, 2612). These navel oranges, of which the Washington Navel, or Bahia, is the best known, are chance kinds or varieties, as other varieties are. The immediate cause of this particular kind of variation, as of other variations, is unknown. The Washington Navel was introduced from Brazil in 1870 by the late Wm. Saunders, and by him distributed as the Bahia (see Van Deman, Report of the Department of Agriculture, 1886, page 267). The two "original" trees in California are still standing at Riverside, carefully protected (Fig. 2613). In recent years, some of the odd and grotesque types of Japanese oranges have been introduced into this country, but they will probably always be curiosities rather than commercial pomological products. See A.G. 1890,333-336. The sweet and sour oranges are considered to be two species (pages 782-784, Volume II), Citrus sinensis and C. Aurantium respectively. To the former belong nearly all the usual commercial oranges, although the King orange is C. nobilis, of which the tangerines, mandarins and satsumas are varieties (Figs. 2614, 2615). The orange belongs to a tribe of three-foliolate plants, and although its leaves appear to be simple, they are really compound. Fig. 2616 shows the articulation above a, at which point the blade is jointed to the rachis; this blade is a leaflet, and the side leaflets have not developed, as they do in the tri- foliolate orange (Citrus, or Poncirus, trifoliata).
 
Orange. Plate LXXVIII. The orange is one of the oldest of cultivated fruits. Its nativity is still in doubt, but it is probable that it is indigenous to the Indo- Chinese region. It is now widely distributed in all warm- temperate and tropical countries, in many of which it has run wild and behaves like a native plant. In parts of Florida the orange was found wild when permanent settlements were made, but it had probably spread from stock that was introduced by the early Spaniards. In stature of tree and character of fruit, the orange has varied immensely. Normally, the fruit contains ten compartments or locules; but under the influence of domestication these compartments have been increased, and in some cases a secondary axis, with its accompanying locules, has been thrust into the center of the fruit, causing the "navel" appearance of some varieties (Figs. 2611, 2612). These navel oranges, of which the Washington Navel, or Bahia, is the best known, are chance kinds or varieties, as other varieties are. The immediate cause of this particular kind of variation, as of other variations, is unknown. The Washington Navel was introduced from Brazil in 1870 by the late Wm. Saunders, and by him distributed as the Bahia (see Van Deman, Report of the Department of Agriculture, 1886, page 267). The two "original" trees in California are still standing at Riverside, carefully protected (Fig. 2613). In recent years, some of the odd and grotesque types of Japanese oranges have been introduced into this country, but they will probably always be curiosities rather than commercial pomological products. See A.G. 1890,333-336. The sweet and sour oranges are considered to be two species (pages 782-784, Volume II), Citrus sinensis and C. Aurantium respectively. To the former belong nearly all the usual commercial oranges, although the King orange is C. nobilis, of which the tangerines, mandarins and satsumas are varieties (Figs. 2614, 2615). The orange belongs to a tribe of three-foliolate plants, and although its leaves appear to be simple, they are really compound. Fig. 2616 shows the articulation above a, at which point the blade is jointed to the rachis; this blade is a leaflet, and the side leaflets have not developed, as they do in the tri- foliolate orange (Citrus, or Poncirus, trifoliata).
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The manufacture of citrous oils, perfumes, citrate of lime, and other by-products has never been developed commercially in California, although at present much experimenting is being done in an effort to encourage such an industry, which is badly needed. At present, the culls mostly go to waste or are applied to the land as fertilizer. The manufacture of marmalade and citrate of lime has been attempted but has not as yet assumed importance.
 
The manufacture of citrous oils, perfumes, citrate of lime, and other by-products has never been developed commercially in California, although at present much experimenting is being done in an effort to encourage such an industry, which is badly needed. At present, the culls mostly go to waste or are applied to the land as fertilizer. The manufacture of marmalade and citrate of lime has been attempted but has not as yet assumed importance.
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An '''orange'''—specifically, the '''sweet orange'''—is the [[citrus]] fruit ''Citrus sinensis'' ([[Synonymy|syn.]] ''Citrus aurantium'' [[Carl Linnaeus|L.]] [[var.]] ''dulcis'' [[Carl Linnaeus|L.]], or ''Citrus aurantium'' [[Antoine Risso|Risso]]) and its [[fruit]]. The orange is a [[Hybrid (biology)|hybrid]] of ancient cultivated origin, possibly between [[pomelo]] (''Citrus maxima'') and [[tangerine]] (''Citrus reticulata''). It is a small [[Flowering plant| flowering]] [[tree]] growing to about 10 [[metres|m]] tall with [[evergreen]] [[leaf|leaves]], which are arranged alternately, of ovate shape with crenulate margins and 4–10 [[centimetre|cm]] long. The orange [[fruit]] is a [[hesperidium]], a type of [[berry]].
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Oranges originated in Southeast [[Asia]].  The fruit of ''Citrus sinensis'' is called ''sweet orange'' to distinguish it from ''Citrus aurantium'', the [[bitter orange]].  In a number of languages, it is known as a "Chinese apple" (e.g. [[Dutch language|Dutch]] ''Sinaasappel'', "China's apple", or "Apfelsine" in German).  The name is thought to ultimately derive from the [[Dravidian languages|Dravidian]] word for the orange tree, with its final form developing after passing through numerous intermediate languages.
      
{{Inc|
 
{{Inc|
 
Citrus sinensis Osbeck (C. Aurantium var. sinensis, Linn. C. Aurantium, Lour, et Auct., not Linn.). Common or Sweet Orange. A medium-sized tree, with a rounded top and regular branches: spines, when present, slender, flexible, rather blunt: lvs. medium-sized, rounded at the base, pointed at the apex; petiole narrowly winged, articulated both with the blade and the twig: fls. medium-sized, smaller than those of the sour orange, white in the bud; petals white on both surfaces; stamens 20-25; ovary subglobose, clearly delimited from the deciduous style: fr. sub- globose or oval, pith solid, pulp sweet, membranes not bitter in taste, segms. 10-12 or 13 in number; seeds cuneate-ovoid with rugose margined plane surfaces, white inside.—The common or sweet orange is widely cult, in all the tropical and subtropical regions of the world. It is rather tender, not so hardy as the sour or Seville orange, but much more cold-resistant than the lemon or lime. A very few orange trees occur in a semi- wild state in S. Fla. Sweet oranges were doubtless intro. into Fla. by the Spaniards nearly four centuries ago and, as they were prop, by seeds until within the last half-century, many local varieties have arisen there. Orange-culture has reached its highest development in S. Calif., where it constitutes one of the most important agricultural industries. Fla. is second only to Calif. in the extent and value of the orange groves, while some oranges arc grown in favored spots in La., Texas, and Ariz.—Oranges are the best known and probably the most highly esteemed dessert fr. A few are used in cooking and the peel is sometimes candied. An essential oil is also pressed from the peel. The sweet orange is commonly used as a stock on which to graft other species of citrous frs. It grows well on light well-drained loam or sandy loam soil. On heavy soil it is subject to the mal di gomma or foot- rot. Very many varieties are in cult. Some of the principal sorts grown in the U. S. are listed here. (1) Florida seedlings— varieties originated in Fla. as a result of prop, oranges from seed, mostly strong-growing trees: Parson Brown. Frs. medium-sized, very early. Pineapple. Frs. medium or large, very juicy; seeds rather numerous: midseason: tree a strong grower. Homosassa. Frs. medium-sized, very juicy: a good bearer and keeper: tree nearly thornless. Madam Vinous. Frs. medium or large; pulp coarse-grained, juicy; midseason. Nonpareil. Frs. rather large, flattened; pulp fine-grained, juicy: tree vigorous. Also Arcadia, Summit, Foster, Hick, Magnum Bonum, May, Old Vini. Osceola, Stark, Whittaker, and very many others of the same general type. (2) Florida mutations or hybrids—new sorts originated in Fla., usually differing in some striking way from the old Fla. seedling ranges, perhaps through hybridization with foreign varieties. Boone (Boone's Early). Frs. medium size, strongly oval or oblong, very juicy, very late, keeping well on the tree: lvs. with petioles varying in width. Lue Gim Gong. Frs. oval, juicy, ripening very late and holding very well on the tree, even until late summer. A variety newly intro. into cult. Drake Star. A rare variety with variegated foliage; usually a poor bearer but sometimes bearing a good crop of excellent fr. (3) Mediterranean varieties, largely intro. into Fla. by Sanford and Lyman Phelps, about 30-40 years ago: Ruby. Frs. small or medium-sized; peel red-orange; pulp streaked with red when fully ripe, juicy; seeds rather few: rather late: tree vigorous, nearly thornless, prolific. St. Michael. Frs. medium-sized, oblong, red-blotched when ripe; flesh wine-red; seeds few; rather early. Jaffa. Frs. large, oblong, juicy; seeds few. Possibly not the same as the celebrated orange of Jaffa, Palestine. Mediterranean Sweet. Frs. large, oval, juicy, late: tree nearly thornless. Majorca. Frs. round or slightly flattened, juicy: rather late. Hart (Hart's Tardiff). Frs. round or slightly oval, medium to large size, juicy; seeds few; ripens very late: similar to the next and thought by some to be identical. Valencia (Valencia Late). Frs. medium to large, oval or rounded, juicy, nearly seedless, very late. A prolific variety, largely grown in Calif. and held in cold storage until early autumn. There are many other Medit. varieties of nearly or quite as much value as some of the above, such as, Centennial, Du Roi, Joppa, Paper Rind, Prata, Saul Blood, St. Michael (Blood), etc.—The navel oranges all show a second smaller more or less included fr. formed at the tip of the main fr. Many varieties are of foreign origin. Washington (Bahia, Washington Navel). Fr. large, rounded slightly, pointed at apex; flesh firm, juicy; skin very tough; seedless: early midseason. The most famous variety of oranges intro. from Bahia, Brazil, by Wm. Saunders of the U. S. Dept. of Agric. in 1870. Its cult. has steadily extended in Calif. until it is the principal variety grown there. It does not succeed well in Fla. Thompson (Thompson's Improved Navel). A smooth-skinned hard-fleshed variety found by A. D. Shamel to arise as a mutation from the preceding, to which it is inferior in quality though better in appearance. Australian. Frs. large, coarse: tree vigorous, but a shy bearer. Also found by Shamel as a variation of the Washington Navel (Bahia). Surprise. Fr. medium-sized, rounded or even slightly flattened, juicy, early, seedless. A variety originated by E. S. Hubbard, of Fla. Double Imperial. Fr. small or medium-sized, navel hidden: pulp firm; seeds few or none. A Brazilian variety, said to fruit well in Fla. when budded on trifoliate orange stock. There are many other varieties of navel oranges occasionally grown on a commercial scale. In Calif., among others, Golden Nugget and Navelencia; in Fla., Egyptian, Melitensis, and Sustain are known. There are doubtless many more navel oranges which should be tested. See Orange. Hybrids: Citranges are hardy hybrids between the common sweet orange and the trifoliate orange, Poncirus trifoliata. The principal varieties are the Rusk, Morton, Colman, Savage, Cunningham and Saunders. See description under Citrange.{{SCH}}
 
Citrus sinensis Osbeck (C. Aurantium var. sinensis, Linn. C. Aurantium, Lour, et Auct., not Linn.). Common or Sweet Orange. A medium-sized tree, with a rounded top and regular branches: spines, when present, slender, flexible, rather blunt: lvs. medium-sized, rounded at the base, pointed at the apex; petiole narrowly winged, articulated both with the blade and the twig: fls. medium-sized, smaller than those of the sour orange, white in the bud; petals white on both surfaces; stamens 20-25; ovary subglobose, clearly delimited from the deciduous style: fr. sub- globose or oval, pith solid, pulp sweet, membranes not bitter in taste, segms. 10-12 or 13 in number; seeds cuneate-ovoid with rugose margined plane surfaces, white inside.—The common or sweet orange is widely cult, in all the tropical and subtropical regions of the world. It is rather tender, not so hardy as the sour or Seville orange, but much more cold-resistant than the lemon or lime. A very few orange trees occur in a semi- wild state in S. Fla. Sweet oranges were doubtless intro. into Fla. by the Spaniards nearly four centuries ago and, as they were prop, by seeds until within the last half-century, many local varieties have arisen there. Orange-culture has reached its highest development in S. Calif., where it constitutes one of the most important agricultural industries. Fla. is second only to Calif. in the extent and value of the orange groves, while some oranges arc grown in favored spots in La., Texas, and Ariz.—Oranges are the best known and probably the most highly esteemed dessert fr. A few are used in cooking and the peel is sometimes candied. An essential oil is also pressed from the peel. The sweet orange is commonly used as a stock on which to graft other species of citrous frs. It grows well on light well-drained loam or sandy loam soil. On heavy soil it is subject to the mal di gomma or foot- rot. Very many varieties are in cult. Some of the principal sorts grown in the U. S. are listed here. (1) Florida seedlings— varieties originated in Fla. as a result of prop, oranges from seed, mostly strong-growing trees: Parson Brown. Frs. medium-sized, very early. Pineapple. Frs. medium or large, very juicy; seeds rather numerous: midseason: tree a strong grower. Homosassa. Frs. medium-sized, very juicy: a good bearer and keeper: tree nearly thornless. Madam Vinous. Frs. medium or large; pulp coarse-grained, juicy; midseason. Nonpareil. Frs. rather large, flattened; pulp fine-grained, juicy: tree vigorous. Also Arcadia, Summit, Foster, Hick, Magnum Bonum, May, Old Vini. Osceola, Stark, Whittaker, and very many others of the same general type. (2) Florida mutations or hybrids—new sorts originated in Fla., usually differing in some striking way from the old Fla. seedling ranges, perhaps through hybridization with foreign varieties. Boone (Boone's Early). Frs. medium size, strongly oval or oblong, very juicy, very late, keeping well on the tree: lvs. with petioles varying in width. Lue Gim Gong. Frs. oval, juicy, ripening very late and holding very well on the tree, even until late summer. A variety newly intro. into cult. Drake Star. A rare variety with variegated foliage; usually a poor bearer but sometimes bearing a good crop of excellent fr. (3) Mediterranean varieties, largely intro. into Fla. by Sanford and Lyman Phelps, about 30-40 years ago: Ruby. Frs. small or medium-sized; peel red-orange; pulp streaked with red when fully ripe, juicy; seeds rather few: rather late: tree vigorous, nearly thornless, prolific. St. Michael. Frs. medium-sized, oblong, red-blotched when ripe; flesh wine-red; seeds few; rather early. Jaffa. Frs. large, oblong, juicy; seeds few. Possibly not the same as the celebrated orange of Jaffa, Palestine. Mediterranean Sweet. Frs. large, oval, juicy, late: tree nearly thornless. Majorca. Frs. round or slightly flattened, juicy: rather late. Hart (Hart's Tardiff). Frs. round or slightly oval, medium to large size, juicy; seeds few; ripens very late: similar to the next and thought by some to be identical. Valencia (Valencia Late). Frs. medium to large, oval or rounded, juicy, nearly seedless, very late. A prolific variety, largely grown in Calif. and held in cold storage until early autumn. There are many other Medit. varieties of nearly or quite as much value as some of the above, such as, Centennial, Du Roi, Joppa, Paper Rind, Prata, Saul Blood, St. Michael (Blood), etc.—The navel oranges all show a second smaller more or less included fr. formed at the tip of the main fr. Many varieties are of foreign origin. Washington (Bahia, Washington Navel). Fr. large, rounded slightly, pointed at apex; flesh firm, juicy; skin very tough; seedless: early midseason. The most famous variety of oranges intro. from Bahia, Brazil, by Wm. Saunders of the U. S. Dept. of Agric. in 1870. Its cult. has steadily extended in Calif. until it is the principal variety grown there. It does not succeed well in Fla. Thompson (Thompson's Improved Navel). A smooth-skinned hard-fleshed variety found by A. D. Shamel to arise as a mutation from the preceding, to which it is inferior in quality though better in appearance. Australian. Frs. large, coarse: tree vigorous, but a shy bearer. Also found by Shamel as a variation of the Washington Navel (Bahia). Surprise. Fr. medium-sized, rounded or even slightly flattened, juicy, early, seedless. A variety originated by E. S. Hubbard, of Fla. Double Imperial. Fr. small or medium-sized, navel hidden: pulp firm; seeds few or none. A Brazilian variety, said to fruit well in Fla. when budded on trifoliate orange stock. There are many other varieties of navel oranges occasionally grown on a commercial scale. In Calif., among others, Golden Nugget and Navelencia; in Fla., Egyptian, Melitensis, and Sustain are known. There are doubtless many more navel oranges which should be tested. See Orange. Hybrids: Citranges are hardy hybrids between the common sweet orange and the trifoliate orange, Poncirus trifoliata. The principal varieties are the Rusk, Morton, Colman, Savage, Cunningham and Saunders. See description under Citrange.{{SCH}}
 
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==Fruit==
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All citrus trees are of the single genus ''Citrus'', and remain largely interbreedable; that is, there is only one "superspecies" which includes [[grapefruit]]s, [[lemon]]s, [[lime (fruit)|lime]]s and oranges.  Nevertheless, names have been given to the various members of the genus, oranges often being referred to as ''Citrus sinensis'' and ''[[bitter orange|Citrus aurantium]]''. Fruits of all members of the genus ''Citrus'' are considered [[berry|berries]] because they have many [[seed]]s, are fleshy and soft, and derive from a single [[ovary (plants)|ovary]]. An orange seed is called a [[pip]]. The white thread-like material, attached to the inside of the peel is called [[pith]].
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==Varieties==
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===Persian orange===
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The Persian orange, grown widely in [[southern Europe]] after its introduction to [[Italy]] in the 11th century, was bitter. Sweet oranges brought to Europe in the 15th century from [[India]] by [[Portugal|Portuguese]] traders, quickly displaced the bitter, and are now the most common variety of orange cultivated. The sweet orange will grow to different sizes and colours according to local conditions, most commonly with ten ''[[carpel]]s'', or segments, inside.
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Some South East European tongues name [[Orange (fruit)|orange]] after Portugal, which was formerly the main source of imports of sweet oranges. Examples are [[Bulgarian language|Bulgarian]] ''portokal'' [портокал], [[Modern Greek|Greek]] ''portokali'' [πορτοκάλι], [[Romanian language|Romanian]] ''portocală'' and [[Georgian language|Georgian]] ''phortokhali'' [ფორთოხალი]. Also in [[Italian dialects|South Italian dialects]] ([[Neapolitan language|Neapolitan]]), orange is named ''portogallo'' or ''purtualle'', literally "the Portuguese ones". Related names can also be found in non-European languages: [[Turkish language|Turkish]] ''Portakal'', [[Arabic language|Arabic]] ''al-burtuqal'' [البرتقال], [[Persian language|Persian]] ''porteghal'' [پرتقال] and [[Amharic]] ''birtukan''.
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[[Portuguese empire|Portuguese]], [[Spanish empire|Spanish]], [[Arab empire|Arab]], and [[Dutch empire|Dutch]] sailors planted citrus trees along trade routes to prevent [[scurvy]]. On his second voyage in [[1493]], Christopher Columbus brought the seeds of oranges, lemons and citrons to [[Haiti]] and the Caribbean. They were introduced in Florida (along with lemons) in [[1513]] by [[Spain|Spanish]] explorer [[Juan Ponce de Leon]], and were introduced to [[Hawaii]] in [[1792]].
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===Navel orange===
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[[Image:Navel orange sectioned.jpg|thumb|250px|left|A peeled sectioned navel orange. The underdeveloped twin is located on the bottom right.]]
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A single [[mutation]] in [[1820]] in an [[orchard]] of sweet oranges planted at a [[monastery]] in [[Brazil]] yielded the '''navel orange''', also known as the Washington, Riverside, or Bahie navel. The mutation causes navel oranges to develop a second orange at the base of the original fruit, opposite the stem. The second orange develops as a [[Conjoined twins|conjoined twin]] in a set of smaller segments embedded within the peel of the larger orange. From the outside, the smaller, and undeveloped twin leaves a formation at the bottom of the fruit that looks similar to the human [[navel]].
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Because the mutation left the fruit seedless and, therefore, sterile, the only means available to cultivate more of this new variety is to graft cuttings onto other varieties of citrus tree. Two such cuttings of the original tree were transplanted<ref>[http://thegoldengecko.com/blog/?p=34 Parent Navel Orange Tree in Riverside, CA]</ref> to [[Riverside, California|Riverside]], [[California]] in [[1870]], which eventually led to worldwide popularity.
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Today, navel oranges continue to be produced via [[cutting (plant)|cutting]] and [[grafting]]. This does not allow for the usual [[artificial selection|selective breeding]] methodologies, and so not only do the navel oranges of today have exactly the same genetic makeup as the original tree, and are therefore [[clones]]; in a sense, all navel oranges can be considered to be the fruit of that single, over a century-old tree.
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On rare occasions, however, further mutations can lead to new varieties.<ref>[http://www.citrusvariety.ucr.edu/citrus/sweet_oranges.html Citrus Variety Collection]</ref>
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===Valencia orange===
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The [[Valencia orange|Valencia]] or [[Murcia]] orange is one of the sweet oranges used for juice extraction. It is a late-season fruit, and therefore a popular variety when the navel oranges are out of season. For this reason, the orange was chosen to be the official [[mascot]] of the [[1982 FIFA World Cup]], which was held in [[Spain]]. The mascot was called "[[Naranjito]]" ("little orange"), and wore the colours of the Spanish soccer team uniform.
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===Blood orange===
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[[Image:2005orange.PNG|thumb|right|Orange output in 2005]]
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The [[blood orange]] has streaks of red in the fruit, and the juice is often a dark burgundy colour. The fruit has found a niche as an interesting ingredient variation on traditional Seville marmalade, with its striking red streaks and distinct flavour. The '''scarlet navel''' is a variety with the same diploid mutation as the navel orange.
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==Cultivation==
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==Propagation==
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Grafting, cuttings for true offspring.  Seed.
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==Pests and diseases==
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==Uses==
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Fruit, juice, marmelade. Oil from peel. Orange peel is used by gardeners as a [[slug]] repellent. Orange leaves can be boiled to make tea.
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==Gallery==
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<gallery>
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Image:Ambersweet oranges.jpg|These varieties are called 'Ambersweet' oranges.
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Image:Orangeseeds.jpg|Featured here are orange seeds (pips).
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Image:Florida navel orange 1.jpg|Navel oranges from Florida are the most common to be sold in US grocery stores.
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Image:2007-12-25-IMG 0451.JPG|Satsuma Oranges picked on Christmas day 2007 in [[Gainesville, Florida]]
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</gallery>
      
==References==
 
==References==
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