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Sagittaria latifolia

Common name:	Duck Potato	Family:	Alismataceae
Author:	Willd.	Botanical references:	60, 200, 274
Synonyms:	Sagittaria variabilis (Engelm.), Sagittaria obtusa (Muhl. ex Willd., non Thunb.)
Known Hazards:	None known
Range:	N. America - all areas except the far north. Naturalized in various parts of Europe[50].
Habitat:	Ditches, ponds, lakes and swampy areas in most parts of N. America[60].
Edibility Rating (1-5):	5	Medicinal Rating (1-5):	1

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	S. chinensis[G,P] S. engelmanniana ssp. longirostra[B,P] S. esculenta[B,P] S. latifolia var. latifolia[B,P] S. latifolia var. obtusa[B,P] S. longirostra[B,P] S. ornithorhyncha[B,P] S. planipes[B,P] S. variabilis var. obtusa[B,P] S. viscosa[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Arrowhead [S], Broad-leaved Arrowhead [H], Broadleaf Arrowhead [P], Duck-potato [B],
Epithets:	From a Dictionary of Botanical Epithets
	latifolia = broad leaved;
Systematics:	From a USDA Plants Database
	Order: Alismatales. Water-plantain family
Noxious, Invasive and Injurious Weeds	From USDA PLANTS database, Weeds Australia , DEFRA Injurious Weeds
	Listed as noxious/invasive for: USA Invasive.

Physical Characteristics

Perennial growing to 1.2m by 0.3m . It is hardy to zone 7 and is not frost tender. It is in flower from July to September, and the seeds ripen from August to September. The flowers are monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and are pollinated by Insects. We rate it 5/5 for edibility and 1/5 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 requires wet soil and can grow in water.

Habitats and Possible Locations

Pond, Bog Garden.

Edible Uses

Root.

Root - raw or cooked[62, 105]. Excellent when roasted, the texture is somewhat like potatoes with a taste like sweet chestnuts[85, 92, 94, 159, 256]. The tubers can be eaten raw but they are rather bitter (especially the skin)[85, 102, 159]. It is best to remove this skin after the tubers have been cooked[183]. The tubers can also be dried and ground into a powder, this powder can be used as a gruel or mixed with cereal flours and used to make bread[85, 94]. The N. American Indians would slice the boiled roots into thin sections and then string them on ropes to dry in much the same way as apples[183].The egg-shaped tubers are 4 - 5cm long and are borne on the ends of slender roots, often 30cm deep in the soil and some distance from the parent plant[85, 92, 94]. The tubers are best harvested in the late summer as the leaves die down[92, 95]. They cannot be harvested by pulling out the plant since the tops break off easily, leaving the tubers in the ground[213].

Medicinal Uses

Disclaimer

Digestive; Poultice.

A poultice of the leaves has been used to stop milk production[222].
A tea made from the roots is used as a digestive[222, 257]. A poultice of the roots is used in the treatment of wounds and sores[222, 257].

Other Uses

None known

Cultivation details

A pond or bog garden plant, it requires a moist or wet loamy soil in a sunny position[1]. Prefers shallow, still or slowly flowing water up to 12cm deep[1, 56].
Hardy to at least -20°c[187].
A polymorphic species[92].

Propagation

Seed - best sown as soon as it is ripe in a pot standing in about 5cm of water. Prick out the seedlings into individual pots when they are large enough to handle, and gradually increase the depth of water as the plants grow until it is about 5cm above the top of the pot. Plant out in late spring or early summer of the following year.
Division of the tubers in spring or autumn. Easy.
Runners potted up at any time in the growing season.

Suppliers

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

PFAF Web Pages

This plant is mentioned in the following web pages

Web References

[H] Details of Scandanavian and European Common names in Henriette's names 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.
[S] SW USA Dist. Maps from the Southwest School of Botanical Medicine
[S] Illustration from the Southwest School of Botanical Medicine
[S] Image from the Southwest School of Botanical Medicine
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[C] Taxon data. from the CalFlora database.
Images from the CalPhoto database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Sagittaria latifolia var. latifolia (a possible synonym).

[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.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.

References for the family Alismataceae.

To be included in 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]).

[50] ? Flora Europaea Cambridge University Press 1964
An immense work in 6 volumes (including the index). The standard reference flora for europe, it is very terse though and with very little extra information. Not for the casual reader.

[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.

[60] Hitchcock. C. L. Vascular Plants of the Pacific Northwest. University of Washington Press 1955
A standard flora for Western N. America with lots of information on habitat etc. Five large volumes, it is not for the casual reader.

[62] Elias. T. and Dykeman. P. A Field Guide to N. American Edible Wild Plants. Van Nostrand Reinhold 1982 ISBN 0442222009
Very readable.

[85] Harrington. H. D. Edible Native Plants of the Rocky Mountains. University of New Mexico Press 1967 ISBN 0-8623-0343-9
A superb book. Very readable, it gives the results of the authors experiments with native edible plants.

[92] Balls. E. K. Early Uses of Californian Plants. University of California Press 1975 ISBN 0-520-00072-2
A nice readable book.

[94] Sweet. M. Common Edible and Useful Plants of the West. Naturegraph Co. 1962 ISBN 0-911010-54-8
Useful wild plants in Western N. America. A pocket guide.

[95] Saunders. C. F. Edible and Useful Wild Plants of the United States and Canada. Dover Publications 1976 ISBN 0-486-23310-3
Useful wild plants of America. A pocket guide.

[102] Kavasch. B. Native Harvests. Vintage Books 1979 ISBN 0-394-72811-4
Another guide to the wild foods of America.

[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.

[159] McPherson. A. and S. Wild Food Plants of Indiana. Indiana University Press 1977 ISBN 0-253-28925-4
A nice pocket guide to this region of America.

[183] Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990 ISBN 0-9628087-0-9
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.

[187] Phillips. R. & Rix. M. Perennials Volumes 1 and 2. Pan Books 1991 ISBN 0-330-30936-9
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.

[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.

[213] Weiner. M. A. Earth Medicine, Earth Food. Ballantine Books 1980 ISBN 0-449-90589-6
A nice book to read though it is difficult to look up individual plants since the book is divided into separate sections dealing with the different medicinal uses plus a section on edible plants. Common names are used instead of botanical.

[222] Foster. S. & Duke. J. A. A Field Guide to Medicinal Plants. Eastern and Central N. America. Houghton Mifflin Co. 1990 ISBN 0395467225
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.

[256] Turner. N. J. Food Plants of Coastal First Peoples UBC Press. Vancouver. 1995 ISBN 0-7748-0533-1
Excellent little handbook about the native food plants of Western Canada. Good descriptions of the plants and their uses with colour photos of most plants.

[257] Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998 ISBN 0-88192-453-9
Very comprehensive but terse guide to the native uses of plants. Excellent bibliography, fully referenced to each plant, giving a pathway to further information. Not for the casual reader.

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Bibliography

Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
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