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Nymphaea tetragona

Common name:	Pygmy Water Lily	Family:	Nymphaeaceae
Author:	Georgi.	Botanical references:	58, 200, 235
Synonyms:
Known Hazards:	None known
Range:	N.E. Europe to E. Asia and eastern N. America.
Habitat:	Ponds and shallow lakes in Japan[58].
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	0

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	Castalia tetragona[B,P] N. tetragona ssp. leibergii[P] N. tetragona var. leibergii[P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Pygmy Water-lily [B], Pygmy Waterlily [P], Shui Lien [E],
Epithets:	From a Dictionary of Botanical Epithets
	phaea = dusky; tetragona = 4 angled;
Systematics:	From a USDA Plants Database
	Order: Nymphaeales. Water-lily family
Other Range Info:	From the Ethnobotany Database
	China

Physical Characteristics

Perennial. It is hardy to zone 2. It is in flower from July to August, and the seeds ripen from August to October. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Flies. The plant is self-fertile. We rate it 2/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It can grow in water.

Habitats and Possible Locations

Pond.

Edible Uses

Root; Seed.

Root[105, 177]. No more details are given.

Medicinal Uses

Disclaimer

None known

Other Uses

None known

Cultivation details

A water plant requiring a rich soil and a sunny position in still[200, 55]. Prefers a pH between 6 and 7[200]. Best grown in 15 - 30cm of water[200].
There are two basic types of plant in this genus (this species is a clumper):-
'crawlers' are species with horizontal roots that often spread freely, with new plants being formed at intervals along the root. These species are useful for naturalising, but they do not flower very freely in the cool summers of Britain[214].
'clumpers' have vertical roots, they form slowly spreading clumps and produce offsets around the crown. These forms flower much more freely in Britain[214].
A very ornamental plant[1].

Propagation

Seed - sow as soon as it is ripe in a greenhouse in pots submerged under 25mm of water. Prick out into individual pots as soon as the first true leaf appears and grow them on in water in a greenhouse for at least two years before planting them out in late spring.
The seed is collected by wrapping the developing seed head in a muslin bag to avoid the seed being lost. Harvest it 10 days after it sinks below the soil surface or as soon as it reappears[200].
Division in May. Each portion must have at least one eye. Submerge in pots in shallow water until established[56].

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

[E] Ethnobotany Data (common names, uses, countries) from the Ethnobotany Database.
[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for the family Nymphaeaceae.

[CHINA] Data Very detailed botanical/identification info. from the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[55] Harris. B. C. Eat the Weeds. Pivot Health 1973
Interesting reading.

[56] Muhlberg. H. Complete Guide to Water Plants. E. P. Publishing Ltd. 1982 ISBN 0-7158-0789-7
Deals with a wide range of plants for temperate areas (and indoor aquaria) with quite a lot of information on cultivation techniques.

[58] Ohwi. G. Flora of Japan. (English translation) Smithsonian Institution 1965
The standard work. Brilliant, but not for the casual reader.

[105] Tanaka. T. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing 1976
The most comprehensive guide to edible plants I've come across. Only the briefest entry for each species, though, and some of the entries are more than a little dubious. Not for the casual reader.

[177] Kunkel. G. Plants for Human Consumption. Koeltz Scientific Books 1984 ISBN 3874292169
An excellent book for the dedicated. A comprehensive listing of latin names with a brief list of edible parts.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[214] Matthews. V. The New Plantsman. Volume 1, 1994. Royal Horticultural Society 1994 ISBN 1352-4186
A quarterly magazine, it has articles on Himalayacalamus hookerianus, hardy Euphorbias and an excellent article on Hippophae spp.

[235] Britton. N. L. Brown. A. An Illustrated Flora of the Northern United States and Canada Dover Publications. New York. 1970 ISBN 0-486-22642-5
Reprint of a 1913 Flora, but still a very useful book.

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Bibliography

Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
WEB search engine by Rich Morris - Home Page- Contact Info
Blagdon Cross, Ashwater, Beaworthy, Devon, EX21 5DF, UK.
Website: www.pfaf.org Phone: 0845 458 4719/_44(0) 1208 872963

This page (UK) http://www.comp.leeds.ac.uk/cgi-bin/pfaf/arr_html?Nymphaea+tetragona
This page (US) http://www.ibiblio.org/pfaf/cgi-bin/arr_html?Nymphaea+tetragona

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We make no claims of magical effects or supernatural powers for any item in this catalog. In spite of legendary attributes or occult and craft tradition, such items are offered as curios only and beliefs concerning their magical effectiveness are related only for historical interest.