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Sophora tetraptera

Common name:	Kowhai	Family:	Leguminosae
Author:	J.F.Mill.	Botanical references:	11, 44, 200
Synonyms:	Edwardsia grandiflora (Salisb.)
Known Hazards:	The plant contains cytosine, which resembles nicotine and is similarly toxic[238].
Range:	New Zealand and S. America - Chile.
Habitat:	Streamsides, forest margins and lowland on North Island in New Zealand, from East Cape to latitude 40° 30's[44].
Edibility Rating (1-5):	0	Medicinal Rating (1-5):	0

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	Edwardsia tetraptera[G]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Kowhai [E],
Epithets:	From a Dictionary of Botanical Epithets
	aptera = without wings; tetraptera = 4 winged;
Systematics:	From a USDA Plants Database
	Order: Fabales. Renamed to Fabaceae -- Pea family
Other Range Info:	From the Ethnobotany Database
	New Zealand

Physical Characteristics

An evergreen tree growing to 10m by 6m at a slow rate. It is hardy to zone 8. It is in leaf all year, in flower in May, and the seeds ripen from September to October. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects. It can fix Nitrogen. We rate it 0/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires moist soil.

Habitats and Possible Locations

Woodland, Sunny Edge.

Edible Uses

None known

Medicinal Uses

Disclaimer

None known

Other Uses

Wood.

Wood - compact, dense, heavy, of great strength, tough, elastic, extremely durable. Used for bearings, turnery, cabinet work, ornamental uses etc[46, 61, 139].

Cultivation details

Succeeds in a well-drained moderately fertile soil in full sun[200]. Requires a warm sheltered position[202]. It grows best in the warmer areas of the country where the wood will be more readily ripened and better able to withstand winter cold[219].
Hardy to about -10°c[200], it succeeds in the open in southern and south-western Britain but is best grown against a wall elsewhere[11, 184]. Plants are of slow to moderate growth[202].
In good summers plants set abundant seed in this country[219].
Plants should be container-grown and planted out whilst young, older plants do not transplant well[219].
Plants in this genus are notably resistant to honey fungus[200].
This species has a symbiotic relationship with certain soil bacteria, these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[200].

Propagation

Seed - best sown as soon as it is ripe in a greenhouse[200]. Pre-soak stored seed for 12 hours in hot (not boiling) water and sow in late winter in a greenhouse[78]. Prick out the seedlings as soon as they are large enough to handle into individual pots in the greenhouse, and grow them on for 2 years under protected conditions. Plant them out into their permanent positions in early summer of their third year.
Cuttings of young shoots with a heel, July/August in a frame[11].
Air-layering[200].

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.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

See the PFAF Links Pages for other sources.

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

References

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[44] Allan. H. H. Flora of New Zealand. Government Printer, Wellington. 1961
The standard work, in 3 volumes though only the first two are of interest to the plant project. Very good on habitats.

[46] Uphof. J. C. Th. Dictionary of Economic Plants. Weinheim 1959
An excellent and very comprehensive guide but it only gives very short descriptions of the uses without any details of how to utilize the plants. Not for the casual reader.

[61] Usher. G. A Dictionary of Plants Used by Man. Constable 1974 ISBN 0094579202
Forget the sexist title, this is one of the best books on the subject. Lists a very extensive range of useful plants from around the world with very brief details of the uses. Not for the casual reader.

[78] Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948
A bit dated but a good book on propagation techniques with specific details for a wide range of plants.

[139] ? Flora of Chile. (in Spanish)
Some information about the useful plants of Chile.

[184] Phillips. R. & Rix. M. Shrubs. Pan Books 1989 ISBN 0-330-30258-2
Excellent photographs and a terse description of 1900 species and cultivars.

[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.

[202] Davis. B. Climbers and Wall Shrubs. Viking. 1990 ISBN 0-670-82929-3
Contains information on 2,000 species and cultivars, giving details of cultivation requirements. The text is terse but informative.

[219] Grey-Wilson. C. & Matthews. V. Gardening on Walls Collins 1983 ISBN 0-00-219220-0
A nice little book about plants for growing against walls and a small section on plants that can grow in walls.

[238] Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995 ISBN 0-7513-020-31
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.

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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.
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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.