Micrantha (citrus)

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

Citrus westeri Tanaka [1]
Citrus micrantha Wester [2]

The micrantha is a wild citrus from the papeda group, native to southern Philippines, particularly islands of Cebu and Bohol. Two varieties are recognized: small-flowered papeda (C. hystrix var. micrantha), locally known as biasong, and small-fruited papeda (C. hystrix var. microcarpa) or samuyao. [3] [4]

Long[ who? ] viewed as a separate species, C. micrantha, it is now generally viewed to fall within Citrus hystrix , but genomic data on the latter is insufficient for a definitive conclusion. [5] A micrantha was one of the progenitor species of some varieties of lime. [6]

Description

Map of inferred original wild ranges of the main Citrus cultivars, and selected relevant wild taxa Map of inferred original wild ranges of the main Citrus cultivars, and selected relevant wild taxa (Fuller et al., 2017).png
Map of inferred original wild ranges of the main Citrus cultivars, and selected relevant wild taxa

The micrantha was first described to Western science in 1915 by Peter Jansen Wester, who worked for the Philippine Bureau of Agriculture at the time.

Biasong

Wester collected ripe fruit specimens of biasong (small-flowered papeda, Citrus hystrix var. micrantha) on islands of Cebu, Bohol, Dumaguete, Negros, and in the Zamboanga and Misamis provinces in Mindanao. The fruits were collected throughout the year, indicating that the plant is ever-bearing. Biasong is characterized by small flowers (thus the "small-flowered" moniker) with fewer stamens than other papedas and oblong-obovate, few-loculed fruits. Though the fruit is not eaten and with little economic importance, its juice is used as a souring agent for kinilaw, or for hair-washing. [3]

Biasong's aroma is similar to that of the samuyao variety of micrantha. The tree reaches 7.5 to 9 metres (25 to 30 ft) in height. Leaves are 9–12 cm (3.5–4.7 in) long, 2.7–4.0 cm (1.1–1.6 in) wide, broadly elliptical to ovate, crenate, thin, with base rounded or broadly acute; apex acutely blunt pointed. Petioles are 3.5–6 cm (1.4–2.4 in) long, broadly winged, up to 4 cm (1.6 in) wide, with wings (phyllodes) sometimes larger than the leaf. Flowers are small, four-petaled, white with a thin purple edge, 12–13 mm (0.47–0.51 in) in diameter, forming cymes of two to five. There are 15 to 17 equal stamens. The ovary is obovoid, with 6 to 8 slender, distinct locules. Fruits are obovate to oblong-obovate, 5–7 cm (2.0–2.8 in) long, with diameter of 3–4 cm (1.2–1.6 in), averaging 26 g (0.92 oz) in weight; their skin is rather thick, lemon-yellow, fairly smooth or with transverse corrugations; the pulp is juicy, grayish and acid, while juice cells are short and blunt to long, long, slender and pointed, sometimes containing a minute, greenish nucleus. They have numerous flat, pointed, reticulate seeds. [3]

Samuyao

Wester collected ripe samuyao (small-fruited papeda, Citrus hystrix var. microcarpa) fruit specimens from cultivation in Cebu and Bohol in June, and from November to February. Samuyao is rather smaller than biasong, with trees attaining 4.5 meters. It has small, thin leaves and flowers comparable in size to biasong. The fruit, 15–20 mm in diameter, is likely to be the smallest in the whole genus. [8] Wester also recorded a somewhat more vigorous variety, called "samuyao-sa-amoo" in Bohol, with slightly larger fruits; there is a possibility that this species was actually Limonellus aurarius, described by Georg Eberhard Rumphius back in 1741 in a nearby area, although his description also fits a number of related species. [8] Wester gave the botanical description: [3]

A shrubby tree, 4.5 meters tall, with slender branches and small, weak spines; leaves 55 to 80 millimeters long, 20 to 25 millimeters broad, ovate to ovate-oblong or elliptical, crenulate, thin, of distinct fragrance, base rounded to broadly acute; apex obtuse, sometimes notched, petioles 20 to 30 millimeters long, broadly winged, about 14 millimeters wide, wing area somewhat less than one-half of the leaf blade; flowers in compact axillary or terminal cymes, 2 to 7, small, 5 to 9 millimeters in diameter, white, with trace of purple on the outside; calyx small, not cupped, petals 3 to 5; stamens 15 to 18, free, equal; ovary very small, globose to obovate; locules 7 to 9, style distinct; stigma small, knob like; fruit 15 to 20 millimeters in diameter, roundish in outline; base sometimes nippled; apex an irregular, wrinkly cavity; surface corrugate, greenish lemon yellow; oil cells usually sunken; skin very thin; pulp fairly juicy, acid, bitter with distinct aroma; juice cells very minute, blunt, containing a small, greenish nucleus; seeds small, flattened, sometimes beaked.

Clear, intensely fragrant oil can be produced from the samuyao peel, and it has been used as a hair fragrance by women who live where it grows. [8]

Toxicity

The micrantha contains a significant amount of bergapten, a linear furanocoumarin well known for its phototoxic effects. [9] Of 61 Citrus varieties tested, C. micrantha had the highest concentration of bergapten of any Citrus species. [10] In particular, C. micrantha contained almost twice as much bergapten as the bergamot orange whose essential oil is highly phototoxic. Indiscriminate use of bergamot essential oil has led to several cases of phytophotodermatitis, [11] [12] a potentially severe skin inflammation. In these cases, the primary causal agent is believed to be bergapten.

Hybrids

The Key lime (Citrus aurantifolia) is a hybrid of the micrantha and the citron. It, in turn, has been crossed with a lemon to produce the Persian lime (C. latifolia). There are lumias that are distinct micrantha/citron hybrids, such as the Pomme d'Adam, while other lumias, like the Borneo lemons, are micrantha/citron/pomelo tri-species hybrids. [13] An Indonesian hybrid, the nansaran (C. amblycarpa), is a C. hystrix/C. reticulata cross. [13]

Related Research Articles

<i>Citrus</i> Genus of flowering plants

Citrus is a genus of flowering trees and shrubs in the rue family, Rutaceae. Plants in the genus produce citrus fruits, including crops such as oranges, mandarins, lemons, grapefruits, pomelos, and limes. The genus Citrus is native to South Asia, East Asia, Southeast Asia, Melanesia, and Australia. Various citrus species have been used and domesticated by indigenous cultures in these areas since ancient times. From there its cultivation spread into Micronesia and Polynesia by the Austronesian expansion ; and to the Middle East and the Mediterranean via the incense trade route, and onwards to Europe and the Americas.

<span class="mw-page-title-main">Mandarin orange</span> Small citrus fruit

The mandarin orange, also known as mandarin or mandarine, is a small, rounded citrus tree fruit. Treated as a distinct species of orange, it is usually eaten plain or in fruit salads. Tangerines are a group of orange-colored citrus fruit consisting of hybrids of mandarin orange with some pomelo contribution.

<span class="mw-page-title-main">Kaffir lime</span> Citrus fruit native to tropical Southeast Asia

Citrus hystrix, called the kaffir lime, Thai lime or makrut lime, is a citrus fruit native to tropical Southeast Asia.

<i>Citrus cavaleriei</i> Species of fruit and plant

Citrus cavaleriei, the Ichang papeda, is a slow-growing species of papeda that has characteristic lemon-scented foliage and flowers.

<span class="mw-page-title-main">Lime (fruit)</span> Citrus fruit

A lime is a citrus fruit, which is typically round, green in color, 3–6 centimetres (1.2–2.4 in) in diameter, and contains acidic juice vesicles.

<span class="mw-page-title-main">Citron</span> Species of citrus plant

The citron, historically cedrate, is a large fragrant citrus fruit with a thick rind. It is said to resemble a 'huge, rough lemon'. It is one of the original citrus fruits from which all other citrus types developed through natural hybrid speciation or artificial hybridization. Though citron cultivars take on a wide variety of physical forms, they are all closely related genetically. It is used in Asian and Mediterranean cuisine, traditional medicines, perfume, and religious rituals and offerings. Hybrids of citrons with other citrus are commercially more prominent, notably lemons and many limes.

<i>Citrus limetta</i> Citrus fruit and plant

Citrus limetta, alternatively considered to be a cultivar of Citrus limon, C. limon 'Limetta', is a species of citrus, commonly known as mousami, musami, sweet lime, sweet lemon, and sweet limetta, it is a member of the sweet lemons. It is small and round like a common lime in shape. It is a cross between the citron and a bitter orange.

<span class="mw-page-title-main">Bergamot orange</span> Citrus fruit

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<span class="mw-page-title-main">Key lime</span> Citrus fruit and plant

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<span class="mw-page-title-main">Sweet lemon</span> Index of plants with the same common name

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<span class="mw-page-title-main">Ponderosa lemon</span> Citrus fruit and plant

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<span class="mw-page-title-main">Papeda (citrus)</span> Citrus fruit and plant

Papeda or papaeda is the common name for a group of Citrus species and varieties native to tropical Asia that are hardy and slow-growing, and produce unpalatable fruit. Walter Tennyson Swingle segregated these species into a separate subgenus, Papeda, that included the Ichang lemon, yuzu, kaffir lime, kabosu, sudachi, and a number of wild and uncultivated species and hybrids. Recent genetic analysis shows the papedas to be distributed among distinct branches of the Citrus phylogenetic tree, and hence Swingle's proposed subgenus is polyphyletic and not a valid taxonomic grouping, but the term persists as a common name.

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<i>Citrus indica</i> Species of fruit and plant

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<span class="mw-page-title-main">Lumia (citrus)</span> Citrus hybrid

The lumia is also called the pear lemon, since its shape resembles a pear. It is also called French lime and sometimes sweet lemon, even though it is not necessarily sweet.

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<span class="mw-page-title-main">Kalpi (fruit)</span> Citrus fruit and plant

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<span class="mw-page-title-main">Pompia</span> Variety of plant

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References

  1. ↑ "Citrus westeri". Germplasm Resources Information Network . Agricultural Research Service, United States Department of Agriculture . Retrieved 16 January 2018.
  2. ↑ Citrus micrantha was first described and published in Philippine Agricultural Review 1915, viii. 20. "Plant Name Details for Citrus micrantha". IPNI . Retrieved 2 September 2015.
  3. 1 2 3 4 P. J. Wester (1915), "Citrus Fruits In The Philippines", Philippine Agricultural Review, 8
  4. ↑ Jorma Koskinen, "Small-flowered and Small-fruited papeda", Citrus Pages
  5. ↑ Ollitrault, Patrick; Curk, Franck; Krueger, Robert (2020). "Citrus taxonomy". In Talon, Manuel; Caruso, Marco; Gmitter, Fred G Jr. (eds.). The Citrus Genus. Elsevier. pp. 57–81. doi:10.1016/B978-0-12-812163-4.00004-8. ISBN   9780128121634. S2CID   242819146.
  6. ↑ Khan, Iqrar A.; Grosser, Jude W. (2004-05-01). "Regeneration and characterization of somatic hybrid plants of Citrus sinensis (sweet orange) and Citrus micrantha, a progenitor species of lime". Euphytica. 137 (2). Kluwer Academic Publishers: 271–278. doi:10.1023/B:EUPH.0000041591.65333.3c. ISSN   1573-5060. S2CID   12880471.
  7. ↑ Fuller, Dorian Q.; Castillo, Cristina; Kingwell-Banham, Eleanor; Qin, Ling; Weisskopf, Alison (2017). "Charred pomelo peel, historical linguistics and other tree crops: approaches to framing the historical context of early Citrus cultivation in East, South and Southeast Asia". In Zech-Matterne, Véronique; Fiorentino, Girolamo (eds.). AGRUMED: Archaeology and history of citrus fruit in the Mediterranean (PDF). Publications du Centre Jean Bérard. pp. 29–48. doi:10.4000/books.pcjb.2107. ISBN   9782918887775.
  8. 1 2 3 Swingle, Walter T. (1943). "The Botany of Citrus and Its Wild Relatives". The Citrus Industry, Vol 1 (Rev). Berkeley: Univ of California Press. Archived from the original on 2013-09-01.
  9. ↑ McGovern, Thomas W.; Barkley, Theodore M. (2000). "Botanical Dermatology". The Electronic Textbook of Dermatology. 37 (5). Internet Dermatology Society. Section  Phytophotodermatitis. doi:10.1046/j.1365-4362.1998.00385.x. PMID   9620476. S2CID   221810453 . Retrieved November 29, 2018.
  10. ↑ Dugrand-Judek, Audray; Olry, Alexandre; Hehn, Alain; Costantino, Gilles; Ollitrault, Patrick; Froelicher, Yann; Bourgaud, Frédéric (November 2015). "The Distribution of Coumarins and Furanocoumarins in Citrus Species Closely Matches Citrus Phylogeny and Reflects the Organization of Biosynthetic Pathways". PLOS ONE. 10 (11): e0142757. Bibcode:2015PLoSO..1042757D. doi: 10.1371/journal.pone.0142757 . PMC   4641707 . PMID   26558757.
  11. ↑ Kaddu, S.; Kerl, H.; Wolf, P. (2001). "Accidental bullous phototoxic reactions to bergamot aromatherapy oil". J Am Acad Dermatol. 45 (3): 458–461. doi:10.1067/mjd.2001.116226. PMID   11511848. Cited in CIR 2013.
  12. ↑ Cocks, H.; Wilson, D. (1998). "Letters to the Editor". Burns. 24 (1): 80. doi:10.1016/S0305-4179(97)00102-2. PMID   9601600. Cited in CIR 2013.
  13. 1 2 Ollitrault, Patrick; Curk, Franck; Krueger, Robert (2020). "Citrus taxonomy". In Talon, Manuel; Caruso, Marco; Gmitter, Fred G Jr. (eds.). The Citrus Genus. Elsevier. pp. 57–81.
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