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Useful Tropical Plants

Dioscorea deltoidea

Wall. ex Griseb.

Dioscoreaceae

+ Synonyms

Dioscorea nepalensis (Jacquem. ex Prain & Burkill) Sweet ex Bernardi

Tamus nepalensis Jacquem. ex Prain & Burkill

Common Name: Yam

Dioscorea deltoidea
Close-up of the leaf
Photograph by: Plant.Hunter
Creative Commons License
Dioscorea deltoidea Dioscorea deltoidea

General Information

Dioscorea deltoidea is a perennial climbing plant, producing vigorous annual stems from a large underground tuber. The stems scramble over the ground and twine into nearby vegetation[
310
Title
Plant Resources of Southeast Asia
Publication
 
Author
 
Website
http://proseanet.org/
Publisher
 
Year
0
ISBN
 
Description
Lots of information on the uses of the plants of SE Asia.
].
The plant is sometimes used locally as a medicine, hair wash and food, but it is mainly of importance as a source of the medically active compound diosgenin. It is commonly harvested from the wild for this compound and also sometimes cultivated in countries such as Vietnam and Russia.

Known Hazards

Edible species of Dioscorea have opposite leaves whilst poisonous species have alternate leaves[
174
Title
Atlas of Medicinal Plants.
Publication
 
Author
Kariyone. T.
Publisher
 
Year
 
ISBN
 
Description
A good Japanese herbal.
].

Botanical References

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 - China, northeast India, Nepal, Nepal, Myanmar, Thailand, Vietnam.

Habitat

Forests and humus-rich soils, 1,700 - 2,800 metres in Kashmir[
145
Title
Forest Flora of Srinagar.
Publication
 
Author
Singh. Dr. G. and Kachroo. Prof. Dr. P.
Publisher
Bishen Singh Mahendra Pal Singh
Year
1976
ISBN
-
Description
A good flora of the western Himalayas but poorly illustrated. Some information on plant uses.
]. Broad-leaved forests and scrub forests at elevations of 2,000 - 3,100 metres in western China[
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 Climber
Height3.00 m
Self-fertileNo
Cultivation StatusCultivated, Wild

Cultivation Details


Easily grown in a fertile well-drained soil in a sunny position or light shade[
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 rich light soil[
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]).
].
Plants produce tubercles (small tubers that are formed in the leaf axils of the stems), and can be propagated by this means[
K
Title
Plants for a Future
Author
Ken Fern
Description
Notes from observations, tasting etc at Plants For A Future and on field trips.
].
A climbing plant that supports itself by twining around the branches of other plants[
219
Title
Gardening on Walls
Publication
 
Author
Grey-Wilson. C. & Matthews. V.
Publisher
Collins
Year
1983
ISBN
0-00-219220-0
Description
A nice little book about plants for growing against walls and a small section on plants that can grow in walls.
].
Dioecious. Both male and female forms must be grown if seed is required.

Edible Uses

Tuber - cooked[
2
Title
Sturtevant's Edible Plants of the World.
Publication
 
Author
Hedrick. U. P.
Publisher
Dover Publications
Year
1972
ISBN
0-486-20459-6
Description
Lots of entries, quite a lot of information in most entries and references.
,
177
Title
Plants for Human Consumption.
Publication
 
Author
Kunkel. G.
Publisher
Koeltz Scientific Books
Year
1984
ISBN
3874292169
Description
An excellent book for the dedicated. A comprehensive listing of Latin names with a brief list of edible parts.
]. A slightly bitter flavour, it is usually boiled with some wood ash in order to remove the bitterness[
272
Title
Plants and People of Nepal
Publication
 
Author
Manandhar. N. P.
Publisher
Timber Press. Oregon.
Year
2002
ISBN
0-88192-527-6
Description
Excellent book, covering over 1,500 species of useful plants from Nepal together with information on the geography and peoples of Nepal. Good descriptions of the plants with terse notes on their uses.
]. Some caution is advised. See notes below on other uses of the root and above on toxicity.

Medicinal

The juice of the root tuber istaken in the evening in the treatment of roundworm[
272
Title
Plants and People of Nepal
Publication
 
Author
Manandhar. N. P.
Publisher
Timber Press. Oregon.
Year
2002
ISBN
0-88192-527-6
Description
Excellent book, covering over 1,500 species of useful plants from Nepal together with information on the geography and peoples of Nepal. Good descriptions of the plants with terse notes on their uses.
]. It is also used to alleviate constipation[
272
Title
Plants and People of Nepal
Publication
 
Author
Manandhar. N. P.
Publisher
Timber Press. Oregon.
Year
2002
ISBN
0-88192-527-6
Description
Excellent book, covering over 1,500 species of useful plants from Nepal together with information on the geography and peoples of Nepal. Good descriptions of the plants with terse notes on their uses.
].

The roots of most, if not all, members of this genus, contains diosgenin[
222
Title
A Field Guide to Medicinal Plants. Eastern and Central N. America.
Publication
 
Author
Foster. S. & Duke. J. A.
Publisher
Houghton Mifflin Co.
Year
1990
ISBN
0395467225
Description
A concise book dealing with almost 500 species. A line drawing of each plant is included plus colour photographs of about 100 species. Very good as a field guide, it only gives brief details about the plants medicinal properties.
,
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.
]. This is widely used in modern medicine in order to manufacture progesterone and other steroid drugs. These are used as contraceptives and in the treatment of various disorders of the genitary organs as well as in a host of other diseases such as asthma and arthritis[
222
Title
A Field Guide to Medicinal Plants. Eastern and Central N. America.
Publication
 
Author
Foster. S. & Duke. J. A.
Publisher
Houghton Mifflin Co.
Year
1990
ISBN
0395467225
Description
A concise book dealing with almost 500 species. A line drawing of each plant is included plus colour photographs of about 100 species. Very good as a field guide, it only gives brief details about the plants medicinal properties.
]. The roots of this species contain an average of 4.8% diosgenin[
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.
].

Other Uses

A soap is obtained from the tuber[
145
Title
Forest Flora of Srinagar.
Publication
 
Author
Singh. Dr. G. and Kachroo. Prof. Dr. P.
Publisher
Bishen Singh Mahendra Pal Singh
Year
1976
ISBN
-
Description
A good flora of the western Himalayas but poorly illustrated. Some information on plant uses.
,
310
Title
Plant Resources of Southeast Asia
Publication
 
Author
 
Website
http://proseanet.org/
Publisher
 
Year
0
ISBN
 
Description
Lots of information on the uses of the plants of SE Asia.
]. This soap is due to the presence of poisonous saponins in the root[
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.
,
K
Title
Plants for a Future
Author
Ken Fern
Description
Notes from observations, tasting etc at Plants For A Future and on field trips.
]. Used for washing shawls and woollen cloth[
287
Title
Flora of Pakistan
Publication
 
Author
 
Website
http://www.efloras.org
Publisher
 
Year
 
ISBN
 
Description
As of 2006, there is not much information on habitats available, but it is being developed and promises to be an excellent resource.
]. The soap is also used as a body wash to kill lice[
145
Title
Forest Flora of Srinagar.
Publication
 
Author
Singh. Dr. G. and Kachroo. Prof. Dr. P.
Publisher
Bishen Singh Mahendra Pal Singh
Year
1976
ISBN
-
Description
A good flora of the western Himalayas but poorly illustrated. Some information on plant uses.
,
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.
,
310
Title
Plant Resources of Southeast Asia
Publication
 
Author
 
Website
http://proseanet.org/
Publisher
 
Year
0
ISBN
 
Description
Lots of information on the uses of the plants of SE Asia.
].

Propagation

Seed - sow in containersl in a sunny position in a nursery seedbed and only just cover. It germinates in 1 - 3 weeks at 20°c[
175
Title
Focus on Plants. Volume 5. (formerly 'Growing from seed')
Publication
 
Author
Bird. R. (Editor)
Publisher
Thompson and Morgan.
Year
1991
ISBN
-
Description
Very readable magazine with lots of information on propagation. A good article on Corydalis spp.
]. Prick out the seedlings as soon as they are large enough to handle and grow on in a greenhouse for their first year. Plant out in late spring as the plant comes into new growth.
Basal stem cuttings in the summer[
37
Title
The Gardener's Assistant.
Publication
 
Author
Thompson. B.
Publisher
Blackie and Son.
Year
1878
ISBN
-
Description
Excellent general but extensive guide to gardening practices in the 19th century. A very good section on fruits and vegetables with many little known species.
].
Division in the dormant season, never when in growth[
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]).
]. The plant will often produce a number of shoots, the top 5 - 10 cm of the root below each shoot can be potted up to form a new plant whilst the lower part of the root can possibly be eaten[
K
Title
Plants for a Future
Author
Ken Fern
Description
Notes from observations, tasting etc at Plants For A Future and on field trips.
].
Tubercles (baby tubers) are formed in the leaf axils. These are harvested in late summer and early autumn when about the size of a pea and coming away easily from the plant. They should be potted up immediately in individual pots in a greenhouse or cold frame. Plant out in early summer when in active growth[
K
Title
Plants for a Future
Author
Ken Fern
Description
Notes from observations, tasting etc at Plants For A Future and on field trips.
].

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