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Useful Tropical Plants

Fortunella japonica

(Thunb.) Swingle

Rutaceae


There is some debate as to whether the round kumquat, or even the genus Fortunella, merit recognition as a distinct species and genus. The Flora of China has submerged the entire genus into one species as Citrus japonica[
266
Title
Flora of China
Publication
 
Author
 
Website
http://flora.huh.harvard.edu/china/
Publisher
Missouri Botanical Garden Press; St. Louis.
Year
1994
ISBN
 
Description
An excellent, comprehensive resource in 25 volumes. In addition to the botanical information the flora also gives basic information on habitat and some uses. An on-line version is also available.
]. At present we are keeping the genus Fortunella distinct, but it is likely that the Flora of China treatment will gain widespread acceptance and, if so, this species will be moved to Citrus[
K
Title
Plants for a Future
Author
Ken Fern
Description
Notes from observations, tasting etc at Plants For A Future and on field trips.
].

+ Synonyms

Citrus japonica Thunb.

Common Name: Round Kumquat

Fortunella japonica
Fruiting plant growing in the Limonaia del Castel, Limone sul Garda, on Lake Garda, Brescia, Italy.


Photograph by: Daderot
Public domain
Fortunella japonica Fortunella japonica Fortunella japonica Fortunella japonica Fortunella japonica Fortunella japonica Fortunella japonica

General Information

Round kumquat is a slow-growing, prickly, evergreen shrub or small tree with a dense crown, reaching a height of 3 - 4 metres[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
,
416
Title
Brazilian Fruits and Cultivated Exotics
Publication
 
Author
Lorenzi. H.; Bacher. L.; Lacerda. M.; Sartori. S.
Publisher
Instituto Plantarum De Estudos Da Flora LTDA; Brazil.
Year
2000
ISBN
85-867174-24-0
Description
A superb book, giving information on several hundred fruit species. Each entry has a brief description of the plant and its uses, accompanied by one to many excellent quality photographs of the fruits.
].
The plant is cultivated for its fruit in many areas of China and Japan, as well as in several other warm temperate to tropical areas[
317
Title
Mansfeld's Database of Agricultural and Horticultural Plants
Publication
 
Author
 
Website
http://mansfeld.ipk-gatersleben.de/pls/htmldb_pgrc/f?p=185:3:4292127278597336
Publisher
 
Year
0
ISBN
 
Description
Terse details of a huge range of useful plants.
]. It is also grown as an ornamental and as a hedge[
418
Title
Ecocrop
Publication
 
Author
 
Website
http://ecocrop.fao.org/ecocrop/srv/en/home
Publisher
 
Year
0
ISBN
 
Description
Basic information on a wide range of useful plants, plus details of environmental needs where available.
].

Known Hazards

None known

Botanical References

200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
,
266
Title
Flora of China
Publication
 
Author
 
Website
http://flora.huh.harvard.edu/china/
Publisher
Missouri Botanical Garden Press; St. Louis.
Year
1994
ISBN
 
Description
An excellent, comprehensive resource in 25 volumes. In addition to the botanical information the flora also gives basic information on habitat and some uses. An on-line version is also available.
,
275
Title
Flora of Japan
Publication
 
Author
 
Website
http://www.foj.info
Publisher
 
Year
0
ISBN
 
Description
An on-line version of the flora - an excellent resource.

Range

E. Asia - China, Japan.

Habitat

Not known in a truly wild situation[
132
Title
Fruits of the Earth.
Publication
 
Author
Bianchini. F., Corbetta. F. and Pistoia. M.
Publisher
 
Year
 
ISBN
 
Description
Lovely pictures, a very readable book.
].

Properties

Edibility Rating *  *  *
Medicinal Rating *  *
Other Uses Rating *  *
HabitEvergreen Shrub
Height2.50 m
Growth RateSlow
PollinatorsInsects
Cultivation StatusCultivated, Ornamental

Cultivation Details

Succeeds in a range of climates from warm temperate to subtropical and at moderate to higher elevations in the tropics. It grows best in areas where annual daytime temperatures are within the range 26 - 35°c, but can tolerate 12 - 40°c[
418
Title
Ecocrop
Publication
 
Author
 
Website
http://ecocrop.fao.org/ecocrop/srv/en/home
Publisher
 
Year
0
ISBN
 
Description
Basic information on a wide range of useful plants, plus details of environmental needs where available.
]. In the cool periods of the year the plant enters a condition of dormancy, with a high resistance to winter cold even if alternated with milder periods[
418
Title
Ecocrop
Publication
 
Author
 
Website
http://ecocrop.fao.org/ecocrop/srv/en/home
Publisher
 
Year
0
ISBN
 
Description
Basic information on a wide range of useful plants, plus details of environmental needs where available.
]. Dormant plants are very cold tolerant, only being killed by temperatures of -15°c or lower, but young growth can be severely damaged at 0°c[
418
Title
Ecocrop
Publication
 
Author
 
Website
http://ecocrop.fao.org/ecocrop/srv/en/home
Publisher
 
Year
0
ISBN
 
Description
Basic information on a wide range of useful plants, plus details of environmental needs where available.
]. It prefers a mean annual rainfall in the range 1,100 - 1,500mm, but tolerates 700 - 4,000mm[
418
Title
Ecocrop
Publication
 
Author
 
Website
http://ecocrop.fao.org/ecocrop/srv/en/home
Publisher
 
Year
0
ISBN
 
Description
Basic information on a wide range of useful plants, plus details of environmental needs where available.
].
Prefers a moderately heavy loam with a generous amount of compost and sand added and a very sunny position[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
]. Prefers a pH of 5 to 6[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
]. Prefers a pH in the range 6.5 - 7.5, tolerating 6 - 8[
418
Title
Ecocrop
Publication
 
Author
 
Website
http://ecocrop.fao.org/ecocrop/srv/en/home
Publisher
 
Year
0
ISBN
 
Description
Basic information on a wide range of useful plants, plus details of environmental needs where available.
]. Plants are intolerant of water logging[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
].
Kumquats are hardier than the various Citrus species since they cease growth when temperatures drop below 13°c but, for best results, they are best grown in a climate where temperatures do not fall lower than between 4 - 10°c[
3
Title
Growing Unusual Fruit.
Publication
 
Author
Simmons. A. E.
Publisher
David & Charles; Newton Abbot.
Year
1972
ISBN
0-7153-5531-7
Description
A very readable book with information on about 100 species that can be grown in Britain (some in greenhouses) and details on how to grow and use them.
]. This is because the fruit is sweeter when it ripens in warm conditions[
3
Title
Growing Unusual Fruit.
Publication
 
Author
Simmons. A. E.
Publisher
David & Charles; Newton Abbot.
Year
1972
ISBN
0-7153-5531-7
Description
A very readable book with information on about 100 species that can be grown in Britain (some in greenhouses) and details on how to grow and use them.
].
There are many named varieties[
3
Title
Growing Unusual Fruit.
Publication
 
Author
Simmons. A. E.
Publisher
David & Charles; Newton Abbot.
Year
1972
ISBN
0-7153-5531-7
Description
A very readable book with information on about 100 species that can be grown in Britain (some in greenhouses) and details on how to grow and use them.
,
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
].

Edible Uses

Fruit - usually cooked and used in jellies, preserves etc[
183
Title
Cornucopia - A Source Book of Edible Plants.
Publication
 
Author
Facciola. S.
Publisher
Kampong Publications
Year
1990
ISBN
0-9628087-0-9
Description
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.
] or used as a flavouring, but it can also be eaten raw. The whole fruit, including the peel, is eaten[
3
Title
Growing Unusual Fruit.
Publication
 
Author
Simmons. A. E.
Publisher
David & Charles; Newton Abbot.
Year
1972
ISBN
0-7153-5531-7
Description
A very readable book with information on about 100 species that can be grown in Britain (some in greenhouses) and details on how to grow and use them.
,
132
Title
Fruits of the Earth.
Publication
 
Author
Bianchini. F., Corbetta. F. and Pistoia. M.
Publisher
 
Year
 
ISBN
 
Description
Lovely pictures, a very readable book.
]. The fruit is acid whilst the peel is sweet[
3
Title
Growing Unusual Fruit.
Publication
 
Author
Simmons. A. E.
Publisher
David & Charles; Newton Abbot.
Year
1972
ISBN
0-7153-5531-7
Description
A very readable book with information on about 100 species that can be grown in Britain (some in greenhouses) and details on how to grow and use them.
,
132
Title
Fruits of the Earth.
Publication
 
Author
Bianchini. F., Corbetta. F. and Pistoia. M.
Publisher
 
Year
 
ISBN
 
Description
Lovely pictures, a very readable book.
]. The peel is golden-yellow, smooth, thinner and somewhat sweeter than the oval kumquat, F. margarita[
183
Title
Cornucopia - A Source Book of Edible Plants.
Publication
 
Author
Facciola. S.
Publisher
Kampong Publications
Year
1990
ISBN
0-9628087-0-9
Description
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.
]. The fruit is rich in pectin and makes excellent marmalades and jellies[
240
Title
Glossary of Indian Medicinal Plants (Including the Supplement).
Publication
 
Author
Chopra. R. N., Nayar. S. L. and Chopra. I. C.
Publisher
Council of Scientific and Industrial Research, New Delhi.
Year
1986
ISBN
-
Description
Very terse details of medicinal uses of plants with a wide range of references and details of research into the plants chemistry. Not for the casual reader.
]. Vitamin C content is up to 0.24 mg/cc[
240
Title
Glossary of Indian Medicinal Plants (Including the Supplement).
Publication
 
Author
Chopra. R. N., Nayar. S. L. and Chopra. I. C.
Publisher
Council of Scientific and Industrial Research, New Delhi.
Year
1986
ISBN
-
Description
Very terse details of medicinal uses of plants with a wide range of references and details of research into the plants chemistry. Not for the casual reader.
]. The fruit is about 4cm long[
260
Title
Conservatory and Indoor Plants Volumes 1 & 2
Publication
 
Author
Phillips. R. & Rix. M.
Publisher
Pan Books, London.
Year
1998
ISBN
0-330-37376-5
Description
Excellent photos of over 1,100 species and cultivars with habits and cultivation details plus a few plant uses. Many species are too tender for outdoors in Britain though there are many that can be grown outside.
].

Medicinal

The plant is antiphlogistic, antivinous, carminative, deodorant, stimulant[
178
Title
Chinese Materia Medica.
Publication
 
Author
Stuart. Rev. G. A.
Publisher
Taipei. Southern Materials Centre
Year
1911
ISBN
-
Description
A translation of an ancient Chinese herbal. Fascinating.
,
218
Title
Medicinal Plants of China
Publication
 
Author
Duke. J. A. and Ayensu. E. S.
Publisher
Reference Publications, Inc.
Year
1985
ISBN
0-917256-20-4
Description
Details of over 1,200 medicinal plants of China and brief details of their uses. Often includes an analysis, or at least a list of constituents. Heavy going if you are not into the subject.
].

The leaves and fruit contain an essential oil, whilst the fruit also contains sugars and organic acids[
283
Title
Medicinal Plants in Vietnam
Publication
 
Author
Nguyen Van Dan & Doan Thi Nhu
Publisher
World Health Organisation
Year
1989
ISBN
92 9061 101 4
Description
An excellent book, giving information on over 200 plants, their medicinal compounds and applications.
]. The fresh fruit is antitussive and expectorant - in Vietnam it is steamed with sugar candy and used in the treatment of sore throats[
283
Title
Medicinal Plants in Vietnam
Publication
 
Author
Nguyen Van Dan & Doan Thi Nhu
Publisher
World Health Organisation
Year
1989
ISBN
92 9061 101 4
Description
An excellent book, giving information on over 200 plants, their medicinal compounds and applications.
]. It is said to be very good for infants[
283
Title
Medicinal Plants in Vietnam
Publication
 
Author
Nguyen Van Dan & Doan Thi Nhu
Publisher
World Health Organisation
Year
1989
ISBN
92 9061 101 4
Description
An excellent book, giving information on over 200 plants, their medicinal compounds and applications.
].

Agroforestry Uses:

The plant can be grown as a hedge[
418
Title
Ecocrop
Publication
 
Author
 
Website
http://ecocrop.fao.org/ecocrop/srv/en/home
Publisher
 
Year
0
ISBN
 
Description
Basic information on a wide range of useful plants, plus details of environmental needs where available.
].

Other Uses

The fresh leaves and young twigs yield 0.21% essential oil that might be suitable for perfumery[
240
Title
Glossary of Indian Medicinal Plants (Including the Supplement).
Publication
 
Author
Chopra. R. N., Nayar. S. L. and Chopra. I. C.
Publisher
Council of Scientific and Industrial Research, New Delhi.
Year
1986
ISBN
-
Description
Very terse details of medicinal uses of plants with a wide range of references and details of research into the plants chemistry. Not for the casual reader.
].

Propagation

Seed - best sown as soon as it is ripe in a warm airy position in a container. When they are large enough to handle, prick out the seedlings into individual pots and grow them on until they are large enough to plant out in their permanent positions.

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