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Ceratophyllum demersum

Common name:	Hornwort	Family:	Ceratophyllaceae
Author:	L.	Botanical references:	17, 200
Synonyms:
Known Hazards:	None known
Range:	Most of Europe, including Britain, but absent from the Arctic.
Habitat:	Ponds and ditches[17].
Edibility Rating (1-5):	1	Medicinal Rating (1-5):	1

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	C. apiculatum[B,P] C. demersum var. apiculatum[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Coon's Tail [P], Coon's-tail [B], Coontail [L], Grof Hoornblad [D], Rigid Hornwort [L],
Epithets:	From a Dictionary of Botanical Epithets
	demersum = under water
Systematics:	From a USDA Plants Database
	Order: Nymphaeales. Hornwort family
Noxious, Invasive and Injurious Weeds	From USDA PLANTS database, Weeds Australia , DEFRA Injurious Weeds
	Listed as noxious/invasive for: Tasmaina.

Physical Characteristics

Perennial growing to 1m at a fast rate. It is hardy to zone 8. It is in flower from July 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 Water. We rate it 1/5 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 can grow in semi-shade (light woodland) or no shade. It requires wet soil and can grow in water.

Habitats and Possible Locations

Pond, Bog Garden.

Edible Uses

Leaves.

Leaves[105, 177]. No further details are given.

Medicinal Uses

Disclaimer

Antiperiodic Stings.

The plant is a cooling antiperiodic[240]. It is useful in the treatment of biliousness and scorpion stings[240].

Other Uses

None known

Cultivation details

Prefers a sandy medium rich in decaying organic matter in full sun, but it tolerates shade better than most submerged aquatic plants[188].
A good pond oxygenator, it usually grows submerged in the water but is sometimes found floating on the surface[1, 188].
This species belongs to one of only two known dicot genera where pollination taks place under water. The anthers of male flowers break off the plant and float to the surface where they release their pollen grains. These then sink under the water to fertilize the female flowers[274]. This species, however, more commonly reproduces asexually[274].
In some parts of the world bilharzia-carrying snails and malaria-carrying mosquito larvae shelter in the leaves of plants of this genus. The plants can also grow so vigorously as to choke waterways, though they also provide good shelter for young fish[274].
The plant is very brittle[1].

Propagation

Seed - we have no details on this species but would suggest sowing the seed as soon as it is ripe in early autumn in a greenhouse with the pot immersed in water. It is likely that the seed will quickly lose viability if allowed to dry out so if it is stored it should be kept cool in a container of water and then be sown in late winter. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in a tray of water in the greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts.
Cuttings in the growing season root easily[188].
Plants propagate themselves naturally when scaly young shoots or winter buds separate from the main plant[188].

Suppliers

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

Web References

[H] Details of Scandanavian and European Common names in Henriette's names database
[L] Scientific and Common Names (some photos) from Lepidoptera and some other life forms
[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.
[C] Taxon data. from the CalFlora database.
[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.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for the family Ceratophyllaceae.

[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]).

[17] Clapham, Tootin and Warburg. Flora of the British Isles. Cambridge University Press 1962
A very comprehensive flora, the standard reference book but it has no pictures.

[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.

[188] Brickell. C. The RHS Gardener's Encyclopedia of Plants and Flowers Dorling Kindersley Publishers Ltd. 1990 ISBN 0-86318-386-7
Excellent range of photographs, some cultivation details but very little information on plant uses.

[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.

[240] Chopra. R. N., Nayar. S. L. and Chopra. I. C. Glossary of Indian Medicinal Plants (Including the Supplement). Council of Scientific and Industrial Research, New Delhi. 1986
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.

Readers Comments

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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

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