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Useful Temperate Plants

Spirodela polyrrhiza

(L.)Schleid.

Araceae


The Temperate Database is in the process of being updated, with new records being added and old ones being checked and brought up to date where necessary. This record has not yet been checked and updated.

+ Synonyms

Common Name: Great Duckweed

No Image.

General Information

Spirodela polyrrhiza is a Perennial up to 0.01 metres tall.
It has edible and medicinal uses.

Known Hazards

None known

Botanical References

17
Title
Flora of the British Isles.
Publication
 
Author
Clapham, Tutin and Warburg.
Publisher
Cambridge University Press
Year
1962
ISBN
-
Description
A very comprehensive flora, the standard reference book but it has no pictures.
,
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.
,
270
Title
Flora of N. America
Publication
 
Author
 
Website
http://flora.huh.harvard.edu/fna/
Publisher
 
Year
0
ISBN
 
Description
An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses.

Range

Europe, including Britain, south and east from Scandanavia to N. Africa and Asia. America, Australia

Habitat

Still water in ditches and ponds[
17
Title
Flora of the British Isles.
Publication
 
Author
Clapham, Tutin and Warburg.
Publisher
Cambridge University Press
Year
1962
ISBN
-
Description
A very comprehensive flora, the standard reference book but it has no pictures.
]. Eutrophic, quiet waters, in temperate to tropical regions[
270
Title
Flora of N. America
Publication
 
Author
 
Website
http://flora.huh.harvard.edu/fna/
Publisher
 
Year
0
ISBN
 
Description
An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses.
].

Properties

Edibility Rating *
Medicinal Rating *  *
HabitPerennial
Height0.01 m
Growth RateFast
Cultivation StatusWild

Cultivation Details

Requires a sunny position in still water that is rich in nitrates and lime[
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.
].
A very small plant without differentiation into various parts such as leaf, stem etc (they are called Thalli), it is 8mm in diameter and often forming a mat on the water surface and perennating by means of buds (turions) that sink in autumn and rise to the surface in spring. The so-called rootcap (really only an apical swelling), has a higher specific gravity than any other part of the plant, righting capsized individuals[
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 plant rarely flowers, spreading mainly by vegetative means[
270
Title
Flora of N. America
Publication
 
Author
 
Website
http://flora.huh.harvard.edu/fna/
Publisher
 
Year
0
ISBN
 
Description
An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses.
].

Edible Uses

The plant is sometimes used as a food[
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.
,
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.
]. No more details are given.

Medicinal

The whole plant is antipruritic, antipyretic, cardiotonic, carminative, diaphoretic, diuretic[
147
Title
A Barefoot Doctors Manual.
Publication
 
Author
?
Publisher
Running Press; Philadelphica.
Year
1977
ISBN
0-914294-92-X
Description
A very readable herbal from China, combining some modern methods with traditional chinese methods.
,
176
Title
Handbook of Chinese Herbs and Formulas.
Publication
 
Author
Yeung. Him-Che.
Publisher
Institute of Chinese Medicine, Los Angeles
Year
1985
ISBN
-
Description
An excellent Chinese herbal giving information on over 500 species. Rather technical and probably best suited to the more accomplished user of herbs.
,
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.
]. It stimulates the appearance of measles rash[
147
Title
A Barefoot Doctors Manual.
Publication
 
Author
?
Publisher
Running Press; Philadelphica.
Year
1977
ISBN
0-914294-92-X
Description
A very readable herbal from China, combining some modern methods with traditional chinese methods.
,
176
Title
Handbook of Chinese Herbs and Formulas.
Publication
 
Author
Yeung. Him-Che.
Publisher
Institute of Chinese Medicine, Los Angeles
Year
1985
ISBN
-
Description
An excellent Chinese herbal giving information on over 500 species. Rather technical and probably best suited to the more accomplished user of herbs.
]. It is used in the treatment of colds, measles, oedema and difficulty in urination[
176
Title
Handbook of Chinese Herbs and Formulas.
Publication
 
Author
Yeung. Him-Che.
Publisher
Institute of Chinese Medicine, Los Angeles
Year
1985
ISBN
-
Description
An excellent Chinese herbal giving information on over 500 species. Rather technical and probably best suited to the more accomplished user of herbs.
].

Other Uses

None known

Propagation

The plant divides freely in the growing season and does not need help.

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