Citrus medica
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Sapindales
Family: Rutaceae
Genus: Citrus
Species: C. medica
Binomial name
Citrus medica

Not to be confused with Cintron.

The citron is a fragrant citrus fruit, botanically classified as Citrus medica by both the Swingle and Tanaka systems. The designation medica given it by Linnaeus is apparently derived from its ancient name "Median or Persian apple"[1] that was reported by Theophrastus,[2] who believed it to be native to Persia or the land of the Medes; there is no relation to medicinal uses of the fruit. Theophrastus notes its smooth sharp thorns, like those of a pear, the very fragrant but inedible 'apple', which keeps moths from clothes, and the fact that "it bears its 'apples' at all season; for when some have been gathered, the flower of others is on the tree and it is ripening others.... This tree, as has been said, grows in Persia and Media." Citron was the first of the citrus fruits to appear in the Mediterranean Basin.

The fruit's name derives ultimately from Latin, and as a result it has many similar names in many European languages, e.g. cederat, cédrat, cedro, etc. This can also be a source of confusion to English speakers, as the word "citron" is a false friend in Czech, Slovak, French, Dutch, German, Yiddish and Scandinavian, in which it actually refers to the lemon.



Main Article: Succade; Main Article: Etrog

The citron is unlike the more common citrus species, such as the lemon or orange. While those more popular fruits are peeled to consume their pulpy and juicy segments, the citron's pulp is dry, containing a small quantity of insipid juice, if any. The main content of a citron fruit is the thick white rind, which adheres to the segments, and cannot be separated from them easily.

Thus, from ancient through medieval times, the citron was used mainly for medical purposes: to combat seasickness, pulmonary troubles, intestinal ailments, and other disorders. The essential oil of the flavedo (the outermost, pigmented layer of rind) was also regarded as an antibiotic.[3] Citron juice with wine was considered an effective antidote to poison, as Theophrastus reported.

Today the citron is used for the fragrance or zest of its flavedo, but the most important part is still the inner rind (known as pith or albedo), which is a fairly important article in international trade and is widely employed in the food industry as succade,[4] as it is known when it is candied in sugar. There is a rising market for the citron in the United States for the use of its soluble fiber found in its thick albedo.[5]

The citron is also used by Jews (the word for it in Hebrew is etrog) for a religious ritual during the Feast of Tabernacles; therefore is considered as a Jewish symbol, and is found on various Hebrew antiques and archeological findings.[6] Citrons used for ritual purposes cannot be grown by grafting branches.

In Iran, the citron's thick white rind is used to make jam; in Pakistan the fruit is used to make jam as well as pickled; in South Indian cuisine, the citron is widely used in pickles and preserves.

In Korea, it is used to create yujacha, a type of Korean tea. The fruit is thinly sliced (peel, pith and pulp) and soaked or cooked in honey or sugar to create a chunky syrup. This syrupy candied fruit is mixed with hot water as a fragrant tea, where the fruit at the bottom of the cup is eaten as well. Often preserved in the syrup for the cold months, yujacha is served as a source of fruit in winter. It is also popular in Taiwan and Japan, where it is known by its Chinese/Japanese name 柚子茶 (Pinyin: youzi cha, Japanese: yuzucha).

Description and variation

3 etrog.JPG Citron varieties

Acidic-pulp varieties:

Non-acidic varieties:

Pulpless varieties:

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CitrusSuccadeHybridGraftingChimeraEtrog • Sukkoth • Four Species
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The citron fruit is usually ovate or oblong, narrowing towards the stylar end. However, the citron's fruit shape is highly variable, due to the large quantity of albedo, which forms independently according to the fruits' position on the tree, twig orientation, and many other factors. The rind is leathery, furrowed, and adherent. The inner portion is thick, white and fleshy; the outer is uniformly thin and very fragrant. The pulp is usually acidic, but also can be sweet, and even pulpless varieties are found.

Most citron varieties contain a large number of monoembryonic seeds. They are white, with dark innercoats and red-purplish chalazal spots for the acidic varieties, and colorless for the sweet ones. Some citron varieties are also distinct, having persistent styles, that do not fall off after fecundation. Those are usually promoted for etrog use.

The Fingered Citron.

Some citrons have medium-sized oil bubbles at the outer surface, medially distant to each other. Some varieties are ribbed and faintly warted on the outer surface. There is also a fingered citron variety called Buddha's hand.

The color varies from green, when unripe, to a yellow-orange when overripe. The citron does not fall off the tree and can reach 8–10 pounds (4–5 kg) if not picked before fully mature.[7] However, they should be picked before the winter, as the branches might bend or break to the ground, and may cause numerous fungal diseases for the tree.


Citrus medica is a slow-growing shrub or small tree that reaches a height of about 8 to 15 ft (2 to 5 m). It has irregular straggling branches and stiff twigs and long spines at the leaf axils. The evergreen leaves are green and lemon-scented with slightly serrate edges, ovate-lanceolate or ovate elliptic 2.5 to 7.0 inches long. Petioles are usually wingless or with minor wings. The flowers are generally unisexual providing self-pollination, but some male individuals could be found due to pistil abortion. The clustered flowers of the acidic varieties are purplish tinted from outside, but the sweet ones are white-yellowish.

The acidic varieties include the Florentine and Diamante citron from Italy, the Greek citron and the Balady citron from Israel. The sweet varieties include the Corsican and Moroccan citrons. Between the pulpless are also some fingered varieties and the Yemenite citron.

The citron tree is very vigorous with almost no dormancy, blooming several times a year, and is therefore fragile and extremely sensitive to frost.[8]

Origin and distribution

Despite the variation among the cultivars, authorities agree the citron is an old and original species. There is molecular evidence that all other cultivated citrus species arose by hybridization among the ancestral types, which are the citron, pomelo, mandarin and papeda.

The citron is believed to be the purest of them all, since it is usually fertilized by self-pollination, and is therefore generally considered to be a male parent of any citrus hybrid rather than a female one.[9]

Today, authorities agree that all citrus species are native to Southeast Asia where they are found wild and in an uncultivated form. The story of how they spread to the Mediterranean has been reported by Francesco Calabrese,[10] Henri Chapot,[11] Samuel Tolkowsky,[12] Elizabetta Nicolisi,[13] and others.[14]

The citron could also be native to India where it borders on Burma, and Pakistan where it is found in valleys at the foot of the Himalayas, and in the Indian Western Ghats.[15][16] It is thought that by the time of Theophrastus, the citron was mostly cultivated in the Persian Gulf on its way to the Mediterranean basin, where it was cultivated during the later centuries in different areas as described by Erich Isaac.[17] Many mention the role of Alexander the Great and his armies as they attacked Persia and what is today Pakistan, as being responsible for the spread of the citron westward, reaching the European countries such as Greece and Italy.[18]

The citron is mentioned in the Torah as being required for ritual use during the Feast of Tabernacles (Lev. 23:40). It is considered that the Jews brought it in The Exodus from Egypt, where the Egyptologist and archaeologist Victor Loret found it depicted on the walls of the botanical garden at the Karnak Temple, which dates back to the time of Thutmosis III.[19]

The opinion that the citron was the forbidden fruit in the Hesperides or Eden does not assist in locating its origin, since the location of the Hesperides is unclear. In any case, there are enough reasons to conclude that it was in the Far East, for example India or Yemen, that the citron is likely to have originated.

The citron in antiquity

The citron has been cultivated since ancient times, predating the cultivation of other citrus species. Despite its minor importance today being hardly consumed as picked, it seems that at different times it played a big role in life. We can see that from the way it has been described by numerous writers and poets. It is likely that when the other citrus species became available, citron lost its popularity, since most of its benefits could be found in the lemon, which is much easier to cultivate.


The following is from the writings of Theophrastus[20]

In the east and south there are special plants... i.e. in Media and Persia there are many types of fruit, between them there is a fruit called Median or Persian Apple. The tree has a leaf similar to and almost identical with that of the andrachn (Arbutus andrachne L.), but has thorns like those of the apios (the wild pear, Pyrus amygdaliformis Vill.) or the firethorn, Cotoneaster pyracantha Spach.), except that they are white, smooth, sharp and strong.

The fruit is not eaten, but is very fragrant, as is also the leaf of the tree; and the fruit is put among clothes, it keeps them from being moth-eaten. It is also useful when one has drunk deadly poison, for when it is administered in wine; it upsets the stomach and brings up the poison. It is also useful to improve the breath, for if one boils the inner part of the fruit in a dish or squeezes it into the mouth in some other medium, it makes the breath more pleasant.

The seed is removed from the fruit and sown in the spring in carefully tilled beds, and it is watered every fourth or fifth day. As soon the plant is strong it is transplanted, also in the spring, to a soft, well watered site, where the soil is not very fine, for it prefers such places.

And it bears its fruit at all seasons, for when some have gathered, the flower of the others is on the tree and is ripening others. Of the flowers I have said[21] those that have a sort of distaff [meaning the pistil] projecting from the middle are fertile, while those that do not have this are sterile. It is also sown, like date palms, in pots punctured with holes.

This tree, as has been remarked, grows in Media and Persia.

Pliny the Elder

About 400 years later it was also described by Pliny the Elder, who called it nata Assyria malus. The following is from his book Natural History.

There is another tree also with the same name of "citrus," and bears a fruit that is held by some persons in particular dislike for its smell and remarkable bitterness; while, on the other hand, there are some who esteem it very highly. This tree is used as an ornament to houses; it requires, however, no further description.[22]
The citron tree, called the Assyrian, and by some the Median apple, is an antidote against poisons. The leaf is similar to that of the arbute, except that it has small prickles running across it. As to the fruit, it is never eaten, but it is remarkable for its extremely powerful smell, which is the case, also, with the leaves; indeed, the odour is so strong, that it will penetrate clothes, when they are once impregnated with it, and hence it is very useful in repelling the attacks of noxious insects.

The tree bears fruit at all seasons of the year; while some is falling off, other fruit is ripening, and other, again, just bursting into birth. Various nations have attempted to naturalize this tree among them, for the sake of its medical properties, by planting it in pots of clay, with holes drilled in them, for the purpose of introducing the air to the roots; and I would here remark, once for all, that it is as well to remember that the best plan is to pack all slips of trees that have to be carried to any distance, as close together as they can possibly be placed. It has been found, however, that this tree will grow nowhere except in Media or Persia. It is this fruit, the pips of which, as we have already mentioned, the Parthian grandees employ in seasoning their ragouts, as being peculiarly conducive to the sweetening of the breath. We find no other tree very highly commended that is produced in Media.[23]

Citrons, either the pulp of them or the pips, are taken in wine as an antidote to poisons. A decoction of citrons, or the juice extracted from them, is used as a gargle to impart sweetness to the breath. The pips of this fruit are recommended for pregnant women to chew when affected with qualmishness. Citrons are good, also, for a weak stomach, but it is not easy to eat them except with vinegar.[24]


  1. ^ Cedrát - Citrus medica a Citrus limonimedica
  2. ^ Theophrastus, Enquiry into Plants, IV.4.2.
  3. ^ Natural healing Website
  4. ^ The Purdue University
  5. ^ Scholarly Document
  6. ^ See Etrog
  7. ^ Un curieux Cedrat marocain, Chapot 1950.
  8. ^ The citrus Industry, The Purdue University
  9. ^ Citrus phylogeny and genetic origin of important species as investigated by molecular markers. 2000
  10. ^ Calabrese, La favolosa storia degli agrumi. L'EPOS, 1998, Palerno Italy. English translation in Citrus: the genus citrus
  11. ^ Capot, "The citrus plant", p.6-13. in: Citrus. Ciba-Geigy Agrochemicals Tech. Monogr.4. Ciba-Geigy Ltd., 1975, Basle, Switzerland.
  12. ^ Tolkowsky, Hesperides. A history of the culture and use of citrus fruits, p.371. John Bale, Sons and Curnow, 1938, London, England.
  13. ^ Nicolisi, Citrus Genetics, Breeding and Biotechnology
  14. ^ The Citrus Industry ^The Purdue University ^Food in China: a cultural and historical inquiry By Frederick J. Simoons, Google Books ^The Search for the Authentic Citron: Historic and Genetic Analysis; HortScienc 40(7):1963–1968. 2005
  15. ^ Sir Joseph Hooker. Flora of British India, i. 514)
  16. ^ COUNTRY REPORT TO THE FAO INTERNATIONAL TECHNICAL CONFERENCE ON PLANT GENETIC RESOURCES (Leipzig, 1996); Prepared by: Nepal Agricultural Research Council; Kathmandu, June 1995; CHAPTER 2.2
  17. ^ Isaac, "The Citron in the Mediterranean: a study in religious influences", Economic Geography, Vol. 35 No. 1. (Jan. 1959) pp. 71–78
  18. ^ The Pordue University
  19. ^ Journal of the Royal Horticultural Society
  20. ^ Historia plantarum 4.4.2-3 (exc. Athenaeus Deipnosophistae 3.83.d-f); cf. Vergil Georgics 2.126-135; Pliny Naturalis historia 12.15,16.
  21. ^ Historia plantarum 1.13.4.
  22. ^ Natural History Chp. 31
  23. ^ Book XII CHAP. 7. (3.
  24. ^ Chp. 56

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  • citron — [ sitrɔ̃ ] n. m. • 1398; du lat. citrus « citronnier », citreum « citron » 1 ♦ Fruit jaune du citronnier, agrume de saveur acide. Écorce, zeste de citron. Rondelle, tranche de citron. Jus de citron. Citron pressé. Boissons au citron, au jus de… …   Encyclopédie Universelle

  • Citron — Cit ron (s[i^]t r[u^]n), n. [F. citron, LL. citro, fr. L. citrus citron tree (cf. citreum, sc. malum, a citron), from Gr. ki tron citron] 1. (Bot) A fruit resembling a lemon, but larger, and pleasantly aromatic; it is produced by the citron tree… …   The Collaborative International Dictionary of English

  • citron — CITRON. s. masc. Sorte de fruit de forme ovale, de couleur jaune pâle, et qui est plein de jus. Citron aigre, citron doux. Jus de citron. Couleur de citron. Chair de citron confite. Ecorce de citron confite.Citron, se dit aussi De la couleur de… …   Dictionnaire de l'Académie Française 1798

  • citron — CITRON. s. m. Sorte de fruit plein de jus, de forme ovale & de couleur jaune pasle. Citron aigre. citron doux. jus de citron. couleur de citron. chair de citron confite. escorce de citron confite …   Dictionnaire de l'Académie française

  • Citron — ist der Familienname folgender Personen: Curt Citron (* 1878), deutscher Reichsgerichtsrat Pierre Citron (1919–2010), französischer Romanist, Literaturwissenschaftler und Musikwissenschaftler Suzanne Citron (* 1922), französische Historikerin… …   Deutsch Wikipedia

  • citron — 1520s, earlier citrine (early 15c.), from Fr. citron citron, lemon (14c.), from augmentative of L. *citrum, related to citrus citron tree, citreum (malum) citron (see CITRUS (Cf. citrus)) …   Etymology dictionary

  • citron — CITRÓN SI / adj. inv., s. n. (de) culoarea lămâiei, galben deschis. (< fr. citron) Trimis de raduborza, 15.09.2007. Sursa: MDN …   Dicționar Român

  • citron — ► NOUN ▪ the large, lemon like fruit of a shrubby Asian tree. ORIGIN Latin citrus citron tree , on the pattern of limon lemon …   English terms dictionary

  • citron — [si′trən] n. [Fr, lemon < It citrone < L citrus,CITRUS] 1. a yellow, thick skinned fruit resembling a lime or lemon but larger and less acid 2. the semitropical tree (Citrus medica) of the rue family bearing this fruit 3. the candied rind… …   English World dictionary

  • CITRON — civitas in tribu Zebulun. Iudic. c. 1. v. 30 …   Hofmann J. Lexicon universale

  • Citron — Surnom possible pour un marchand de citrons ou un homme au visage jaune, le nom, comme sa variante néerlandaise Citroen, a été souvent porté par des juifs askhénazes (voir Zitrone) …   Noms de famille

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