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Useful Tropical Plants

Amorphophallus konjac

K.Koch

Araceae

+ Synonyms

Amorphophallus mairei H.Lév.

Amorphophallus nanus H.Li & C.L.Long

Amorphophallus palmiformis Durieu ex Rivière

Amorphophallus rivierei Durand ex Carrière

Brachyspatha konjac (K.Koch) K.Koch

Conophallus konjak Schott

Conophallus konniaku Schott ex Fesca

Hydrosme rivierei (Durand ex Carrière) Engl.

Proteinophallus rivierei (Durand ex Carrière) Hook.f.

Tapeinophallus rivierei (Durand ex Carrière) Baill.

Common Name: Devil's Tongue

Amorphophallus konjac
Cultivated for food, the plant sends up its large flowering stems before the leaves are produced.
Photograph by: KENPEI
Creative Commons Attribution-Share Alike 3.0
Amorphophallus konjac Amorphophallus konjac Amorphophallus konjac Amorphophallus konjac Amorphophallus konjac Amorphophallus konjac

General Information

Devil's tongue is a perennial plant producing a single leaf each year that can be 100cm long, growing from a globose tuber that can be 30cm in diameter[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
]. It produces long, rhizomatous offsets that can be 50cm long and 3cm thick[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].
This species is being increasingly cultivated for its edible tubers in Japan and China[
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.
,
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.
].

Known Hazards

We have one report that this plant is very toxic raw, though no more details are given[
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.
]. It belongs to a family where most of the members contain calcium oxalate crystals. This substance is toxic fresh and, if eaten, makes the mouth, tongue and throat feel as if hundreds of small needles are digging in to them. However, calcium oxalate is easily broken down either by thoroughly cooking the plant or by fully drying it and, in either of these states, it is safe to eat the plant. People with a tendency to rheumatism, arthritis, gout, kidney stones and hyperacidity should take especial caution if including this plant in their diet[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.
].

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.

Range

E. Asia - southwest China.

Habitat

Loose leafy detritus in moist shady habitats[
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.
]. Forest margins and thickets at elevations of 830 - 1,200 metres in western Yunnan[
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.
].

Properties

Edibility Rating *  *  *  *
Medicinal Rating *  *
Other Uses Rating *  *
HabitPerennial
Height0.75 m
PollinatorsFlies
Cultivation StatusCultivated, Wild

Cultivation Details

Plants can tolerate a minimum temperature of 15°c during the growing season, though the optimum range is 20 - 25°c[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].
The best crops are produced on deep, fertile, alluvial soils that are slightly acid[
300
Title
Vegetables in the Tropics
Publication
 
Author
Tindall. H. D.
Publisher
MacMillan, Oxford.
Year
1983
ISBN
0-333-24268-8
Description
An excellent, in-depth look at the main vegetable crops that can be grown in the Tropics, plus many less well-known plants.
]. Dislikes heavy clay soils[
300
Title
Vegetables in the Tropics
Publication
 
Author
Tindall. H. D.
Publisher
MacMillan, Oxford.
Year
1983
ISBN
0-333-24268-8
Description
An excellent, in-depth look at the main vegetable crops that can be grown in the Tropics, plus many less well-known plants.
]. Plants require some shade, especially when young[
300
Title
Vegetables in the Tropics
Publication
 
Author
Tindall. H. D.
Publisher
MacMillan, Oxford.
Year
1983
ISBN
0-333-24268-8
Description
An excellent, in-depth look at the main vegetable crops that can be grown in the Tropics, plus many less well-known plants.
]. Members of this genus generally require a moist but well-drained, humus-rich, fertile soil and a position in dappled shade[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].
The plant produces one enormous leaf and one flowering stem annually. When ripe for pollination, the flowers have a foetid smell to attract carrion flies and midges. This smell disappears once the flower has been pollinated[
245
Title
Scented Flora of the World.
Publication
 
Author
Genders. R.
Publisher
Robert Hale. London.
Year
1994
ISBN
0-7090-5440-8
Description
An excellent, comprehensive book on scented plants giving a few other plant uses and brief cultivation details. There are no illustrations.
].
The tubers are planted 15cm deep[
1
Title
RHS Dictionary of Plants plus Supplement. 1956
Publication
 
Author
F. Chittendon.
Publisher
Oxford University Press
Year
1951
ISBN
-
Description
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaced in 1992 by a new dictionary (see [200]).
].
Like many species in the family Araceae, this plant has the ability to heat the flowering spadix as the pollen becomes ready for fertilization. This heat greatly increases the strength of the aroma released by the plant, thus attracting more pollinating insects. It can also have the effect of making the insects more active, thus increasing the level of fertilization[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].

Edible Uses

Corm - cooked[
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.
]. The root must be thoroughly boiled or baked, it is acrid when raw (see notes above on 'Known Hazards'[
K
Title
Plants for a Future
Author
Ken Fern
Description
Notes from observations, tasting etc at Plants For A Future and on field trips.
])[
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.
]. Very large, it can be up to 30cm in diameter[
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.
]. In Japan the large brown tubers are peeled, cooked and pounded to extract their starch, which is solidified with dissolved limestone into an edible gel called 'Konnyaku'[
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.
]. Konnyaku is a type of flour valued for its use in many dietary products[
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.
]. The flour is valued for its ability to clean the digestive tract without being a laxative[
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.
]. A nutritional analysis is available[
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.
]. This root is very high in water and low in calories, so it is being promoted as a diet food in N. America[
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.
].
Especially just before the foliage declines prior to dormancy, the tubers are a rich source of mannan, a polysaccharide of mannose and glucose[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
]. The mannose is extracted and widely used in foods for diabetics[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
]. Glucomannan, a soluble fibre formed from mannan and glucose, cannot be metabolized by the human body, but is metabolized by intestinal bacteria. Inside the digestive system, glucomannan absorbs up to 200 times its weight in water without any negative action upon the digestive system. It therefore can give a feeling of fullness and be of use to aid in weight loss, it also relieves constipation and irritable bowel syndrome, as well as reducing serum cholesterol levels[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].
Glucomannan is widely used as an emulsifier and stabilizer in foods and drinks[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].

Medicinal

The root is oxytocic and sialagogue[
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.
]. It is used in the treatment of cancer[
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.
].
Glucomannan, a soluble fibre obtained from the tuber, cannot be metabolized by the human body, but is metabolized by intestinal bacteria. Inside the digestive system, glucomannan absorbs up to 200 times its weight in water without any negative action upon the digestive system. It therefore can give a feeling of fullness and be of use to aid in weight loss, it also relieves constipation and irritable bowel syndrome, as well as reducing serum cholesterol levels[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].

The flowers are febrifuge[
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.
].

Agroforestry Uses:

A system of cultivation, known as jinjenjo, is often practised in Japan. In this, the plants are grown in a natural plant community and are heavily mulchd with grain straw or wild herbs. The plants thus grown are remarkably free from pests and diseases. The largest tubers are harvested at the end of the year, leaving the rest in the ground to grow on for harvest in later years[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].

Other Uses

The plant has insecticidal properties[
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.
].

Glucomannan, obtained from the tuber, has a wide range of used in various industries. It has gelling and film-forming properties and is widely used as an emulsifier and stabilizer in foods, drinks, cosmetics and the pharmaceutical industry. It is also used as a non-clay drilling fluid in the diamond and oil industries[
472
Title
Aroids: Plants of the Arum Family.
Publication
 
Author
Bown D.
Publisher
Timber Press; Portland, Oregon.
Year
2000
ISBN
0-88192-485-7
Description
An excellent treatment of the family Araceae, giving lots of information about the plants, how to grow them, their uses etc. I found it a bit disordered - if you want all the information on a specific species you have to trawl through the whole book.
].

Propagation

Seed - best sown in containers as soon as it is ripe and the pot sealed in a plastic bag to retain moisture. It usually germinates in 1 - 8 months at 24°c[
133
Title
Growing from Seed. Volume 1.
Publication
 
Author
Rice. G. (Editor)
Publisher
Thompson and Morgan.
Year
1987
ISBN
-
Description
Very readable magazine with lots of information on propagation.
]. When large enough to handle, prick the seedlings out into individual pots and grow them on untill large enough to plant out.
Division of corms when the plant is dormant. Either 1 year old corms or portions of 3 year old corms are used[
300
Title
Vegetables in the Tropics
Publication
 
Author
Tindall. H. D.
Publisher
MacMillan, Oxford.
Year
1983
ISBN
0-333-24268-8
Description
An excellent, in-depth look at the main vegetable crops that can be grown in the Tropics, plus many less well-known plants.
].
Cite as: Tropical Plants Database, Ken Fern. tropical.theferns.info. 2018-08-16. <tropical.theferns.info/viewtropical.php?id=Amorphophallus+konjac>

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