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This genus is accepted, and its native range is Himalaya to S. Central & S. Japan and Australia.

[FZ]

Rutaceae, F. A. Mendoça. Flora Zambesiaca 2:1. 1963

Habit
Small trees or shrubs.
Leaves
Leaves 1-foliolate, with winged rhachis.
Flowers
Flowers bisexual, (4) 5-merous.
Stamens
Stamens numerous, in phalanges.
Ovary
Ovary (4) 5-many-locular; loculi 4–8-ovulate.
Fruits
Fruit a large globose or ovoid or obovoid hesperidium, many-seeded and usually composed of numerous carpels.
Note
No indigenous species of Citrus are found in our area but some of the cultivated species (especially C. limon (L.) Burm. f. and C. aurantium L.) may become naturalized. Dr. G. R. Bates has kindly provided the appended note on the cultivation of Citrus in the Federation.

[FTEA]

Rutaceae, J.O. Kokwaro (University of Nairobi). Flora of Tropical East Africa. 1982

Habit
Small evergreen shrubs or trees up to 10 m. high
Leaves
Leaves unifoliolate, with articulation between leaflet and petiole (except in C. medica); petiole normally winged
Flowers
Flowers single or in small clusters in leaf-axils, bisexual; calyx cup-shaped, 3–5-lobed; petals 4–8, normally 5, white; stamens numerous (20–40), in groups
Ovary
Ovary with 8–15 united carpels; locules 4–8-ovulate, with axile placentation
Fruits
Fruit a large globose, ovoid or obovoid berry known as a hesperidium, usually composed of many carpels, many-seeded.

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Habit
Evergreen shrubs or trees; axillary spines usually present
Leaves
Leaves 1-foliolate, usually with petiole winged and articulated at the tip, gland-dotted
Flowers
Flowers usually bisexual, axillary, sometimes clustered, fragrant
Calyx
Calyx 3–5-lobed
Corolla
Petals (4–)5(–8), white
Stamens
Stamens 20–60, in bundles
Ovary
Ovary of 8–18 united carpels, each cell with 4–8 axile ovules
Fruits
Fruit a leathery-skinned berry known as a “hesperidium”, segmented and filled with inflated hair-cells full of juice.
Distribution
Cultivated
Note
Some 16 species of Asian origin, most of which may be ancient apomictic hybrids. The taxonomy of the genus is complex and confusing and new hybrids are continuously being produced also involving species in other genera.

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[FSOM]
Use
The citrus fruits are of great economic importance, but in Somalia only grapefruit, lemon and lime are grown to any larger extent.

Native to:

Assam, Bangladesh, Belize, Bismarck Archipelago, Borneo, Cambodia, China North-Central, China South-Central, China Southeast, East Himalaya, Hainan, Japan, Jawa, Laos, Lesser Sunda Is., Malaya, Maluku, Myanmar, Nansei-shoto, Nepal, New Caledonia, New Guinea, New South Wales, Nicobar Is., Northern Territory, Philippines, Queensland, Solomon Is., South Australia, Sulawesi, Sumatera, Taiwan, Thailand, Vietnam, Wallis-Futuna Is., West Himalaya

Introduced into:

Alabama, Albania, Algeria, Andaman Is., Angola, Argentina Northeast, Argentina Northwest, Bahamas, Benin, Bermuda, Bolivia, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Canary Is., Cape Verde, Cayman Is., Central American Pac, Chad, Christmas I., Colombia, Cook Is., Costa Rica, Cuba, Dominican Republic, Ecuador, Egypt, El Salvador, Ethiopia, Fiji, Galápagos, Gambia, Guinea-Bissau, Gulf of Guinea Is., Haiti, Honduras, Illinois, India, Italy, Jamaica, Korea, Leeward Is., Libya, Madeira, Mauritania, Mauritius, Mexico Central, Mexico Southeast, Mississippi, Morocco, Mozambique, Niger, Niue, Oman, Panamá, Paraguay, Peru, Puerto Rico, Rodrigues, Réunion, Samoa, Santa Cruz Is., Society Is., Socotra, Somalia, Sri Lanka, Tadzhikistan, Tennessee, Tibet, Tonga, Trinidad-Tobago, Tunisia, Uzbekistan, Vanuatu, Venezuela, Windward Is.

Citrus L. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
New Guinea 34478.000
Sands, M.J.S. [832], Papua New Guinea 29047.056
Utteridge, T.M.A. [316], New Guinea 71256.000
70000.266

First published in Sp. Pl.: 782 (1753)

Accepted by

  • Wu, Z. & Raven, P.H. (eds.) (2008). Flora of China 11: 1-622. Science Press (Beijing) & Missouri Botanical Garden Press (St. Louis).
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.

Literature

Flora Zambesiaca

  • Gen. Pl. ed. 5: 341 (1754).
  • Sp. Pl. 2: 782 (1753)

Flora of Somalia

  • Flora Somalia, Vol 2, (1999) Author: by M. Thulin [updated by M. Thulin 2008]
  • Townsend in Flora of Iraq 4(1): 465–473 (1980).
  • Tanaka, Species problems in Citrus, Revisio Aurantiacearum IX (1954)
  • Swingle, The botany of Citrus and its wild relatives, in Webber & Batchelor, The Citrus Industry 1: 129–474 (1943)

Flora of Tropical East Africa

  • L., Gen. Pl., ed. 5: 341 (1754)
  • Sp. Pl.: 782 (1753)

Art and Illustrations in Digifolia
Digital Image © Board of Trustees, RBG Kew

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Somalia
Flora of Somalia
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0