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Populus angustifolia

Common name: Narrowleaf Cottonwood Family: Salicaceae
Author: James. Botanical references: 11, 60, 200
Synonyms:  
Known Hazards: None known
Range: Western N. America - Alberta to Mexico.
Habitat: Streambanks in dry mountains, foothills and dry plains[60].
Edibility Rating (1-5): 2Medicinal Rating (1-5):2

Other Possible Synonyms:From various places across the web, may not be correct. See below.
P. balsamifera var. angustifolia[B,P] P. canadensis var. angustifolia[B,P] P. fortissima[B,P] P. salicifolia[B,P] P. tweedyi[B,P] P. x sennii[B,P]
Other Common Names:From various places around the Web, may not be correct. See below.
Narrow-leaf Cottonwood [B], Narrowleaf Cottonwood [P,FEIS,L],
Epithets:From a Dictionary of Botanical Epithets
angustifolia = narrow leaved
Systematics:From a USDA Plants Database
Order: Salicales. Willow family
Other Range Info: From the Ethnobotany Database
Us

Physical Characteristics

A decidious tree growing to 30m at a fast rate. It is hardy to zone 3. The flowers are dioecious (individual flowers are either male or female, but only one sex is to be found on any one plant so both male and female plants must be grown if seed is required) and are pollinated by Wind. The plant not is self-fertile. We rate it 2/5 for edibility and 2/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils, requires well-drained soil and can grow in heavy clay 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, Canopy.

Edible Uses

Gum Inner bark Sweetener.

Inner bark[105, 161, 177] There are no more details but inner bark is often dried, ground into a powder and then used as a thickener in soups etc or added to cereals when making bread.
A 'honeydew', produced on the undersides of leaves by aphis, was collected by various native North American Indian tribes and used as a sweetener[227].
The buds have been used as a chewing gum[257].

Medicinal Uses

Disclaimer

Analgesic Antiinflammatory Antiscorbutic Febrifuge Odontalgic.

A tea made from the inner bark is used in the treatment of scurvy[161].
The bark contains salicin, a glycoside that probably decomposes into salicylic acid (aspirin) in the body[213, 226, 238]. The bark is therefore anodyne, anti-inflammatory and febrifuge. It is used especially in treating rheumatism and fevers, and also to relieve the pain of menstrual cramps[238].
The woolly fruit is moistened and applied to the gums in order to treat infections[226].
A tea made from the fruits is used in the treatment of toothache[226].

Other Uses

Basketry Rooting hormone Soil stabilization Wood.

An extract of the shoots can be used as a rooting hormone for all types of cuttings. It is extracted by soaking the chopped up shoots in cold water for a day[172].
The young shoots are used in making baskets[227, 257].
The highly developed root system helps to reduce erosion when trees are planted on banks and slopes[226].
Wood - weak, soft, rather woolly in texture, without smell or taste, of low flammability, not durable, very resistant to abrasion[11, 227]. It weighs 24lb per cubic foot[235]. The tree's scarcity and small size make it commercially unimportant, though it is sometimes used locally for fence posts and fuel[227, 229].

Cultivation details

An easily grown plant, it does well in a heavy cold damp soil[1]. Prefers a deep rich well-drained circumneutral soil, growing best in the south and east of Britain[11, 200]. Growth is much less on wet soils, on poor acid soils and on thin dry soils[11]. It does not do well in exposed upland sites[11]. Dislikes shade, it is intolerant of root or branch competition[200].
A fast-growing but short-lived species in the wild[229]. The young leaves and expanding buds emit a pleasant distinctive fragrance in the spring[226].
Poplars have very extensive and aggressive root systems that can invade and damage drainage systems. Especially when grown on clay soils, they should not be planted within 12 metres of buildings since the root system can damage the building's foundations by drying out the soil[11].
Dioecious. Male and female plants must be grown if seed is required.
Hybridizes freely with other members of this genus[200].

Propagation

Seed - must be sown as soon as it is ripe in spring[113]. Poplar seed has an extremely short period of viability and needs to be sown within a few days of ripening[200]. Surface sow or just lightly cover the seed in trays in a cold frame. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in the old frame. If sufficient growth is made, it might be possible to plant them out in late summer into their permanent positions, otherwise keep them in the cold frame until the following late spring and then plant them out. Most poplar species hybridize freely with each other, so the seed may not come true unless it is collected from the wild in areas with no other poplar species growing[11].
Cuttings of mature wood of the current season's growth, 20 - 40cm long, November/December in a sheltered outdoor bed or direct into their permanent positions. Very easy.
Suckers in early spring[78].

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

References for the family Salicaceae.

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]).

[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.

[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.

[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.

[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.

[113] Dirr. M. A. and Heuser. M. W. The Reference Manual of Woody Plant Propagation. Athens Ga. Varsity Press 1987 ISBN 0942375009
A very detailed book on propagating trees. Not for the casual reader.

[161] Yanovsky. E. Food Plants of the N. American Indians. Publication no. 237. U.S. Depf of Agriculture.
A comprehensive but very terse guide. Not for the casual reader.

[172] Schofield. J. J. Discovering Wild Plants - Alaska, W. Canada and the Northwest.
A nice guide to some useful plants in that area.

[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.

[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.

[226] Lauriault. J. Identification Guide to the Trees of Canada Fitzhenry and Whiteside, Ontario. 1989 ISBN 0889025649
Very good on identification for non-experts, the book also has a lot of information on plant uses.

[227] Vines. R.A. Trees of North Texas University of Texas Press. 1982 ISBN 0292780206
A readable guide to the area, it contains descriptions of the plants and their habitats with quite a bit of information on plant uses.

[229] Elias. T. The Complete Trees of N. America. Field Guide and Natural History. Van Nostrand Reinhold Co. 1980 ISBN 0442238622
A very good concise guide. Gives habitats, good descriptions, maps showing distribution and a few of the uses. It also includes the many shrubs that occasionally reach tree proportions.

[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.

[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.

[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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