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Astragalus canadensis

Common name:	Canadian Milkvetch	Family:	Leguminosae
Author:	L.	Botanical references:	43, 200, 274
Synonyms:	Astragalus carolinianus (L.)
Known Hazards:	Many members of this genus contain toxic glycosides[65]. All species with edible seedpods can be distinguished by their fleshy round or oval seedpod that looks somewhat like a greengage.[85] A number of species can also accumulate toxic levels of selenium when grown in soils that are relatively rich in that element[65].
Range:	Central and eastern N. America - Quebec to Saskatchewan, New York, Louisiana, Nebraska and Utah.
Habitat:	Shores and rich thickets[43]. Rocky and sandy thickets in Texas[274].
Edibility Rating (1-5):	3	Medicinal Rating (1-5):	2

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	A. canadensis var. canadensis[B,G,P] A. canadensis var. carolinianus[B,P] A. canadensis var. longilobus[B,P] A. halei[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Canada Milk Vetch [H], Canadian Milk-vetch [B], Canadian Milkvetch [P],
Epithets:	From a Dictionary of Botanical Epithets
	canadensis = northeastern America cana = grayed due to hairs
Systematics:	From a USDA Plants Database
	Order: Fabales. Renamed to Fabaceae -- Pea family

Physical Characteristics

Perennial growing to 1m. It is hardy to zone 8. It is in flower in July. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees and Lepidoptera (Moths & Butterflies). It can fix Nitrogen. We rate it 3/5 for edibility and 2/5 for medicinal use.

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

Habitats and Possible Locations

Cultivated Beds.

Edible Uses

Root.

Root - raw or boiled[22, 46, 61, 105, 177]. They were often used in a broth[257]. The roots are gathered in spring or autumn[161]. Some caution is advised, if the root is bitter it could be due to the presence of toxic alkaloids[65].

Medicinal Uses

Disclaimer

Analgesic Febrifuge Haemostatic.

The root is analgesic and antihaemorrhagic[257]. It can be chewed or used as a tea to treat chest and back pains, coughs and the spitting up of blood[257]. A decoction of the root is used as a febrifuge for children[207, 257]. A poultice made from the chewed root has been used to treat cuts[257].

Other Uses

None known

Cultivation details

Requires a dry well-drained soil in a sunny position[1].
This species is not hardy in the colder areas of the country, it tolerates temperatures down to between -5 and -10° c[200].
Plants are intolerant of root disturbance and are best planted in their final positions whilst still small[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]. Many members of this genus can be difficult to grow, this may be due partly to a lack of their specific bacterial associations in the soil[200].

Propagation

Seed - best sown as soon as it is ripe in a cold frame[200]. A period of cold stratification may help stored seed to germinate[200]. Stored seed, and perhaps also fresh seed, should be pre-soaked for 24 hours in hot water before sowing - but make sure that you do not cook the seed[134, 200]. Any seed that does not swell should be carefully pricked with a needle, taking care not to damage the embryo, and re-soaked for a further 24 hours[134, 200]. Germination can be slow and erratic but is usually within 4 - 9 weeks or more at 13° c if the seed is treated or sown fresh[134]. As soon as it is large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for their first winter, planting them out into their permanent positions in late spring or early summer, after the last expected frosts.

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
[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.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Astragalus canadensis var. canadensis (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.
[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.

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]).

[22] Sholto-Douglas. J. Alternative Foods.
Not very comprehensive, it seems more or less like a copy of earlier writings with little added.

[43] Fernald. M. L. Gray's Manual of Botany. American Book Co. 1950
A bit dated but good and concise flora of the eastern part of N. America.

[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.

[65] Frohne. D. and Pfänder. J. A Colour Atlas of Poisonous Plants. Wolfe 1984 ISBN 0723408394
Brilliant. Goes into technical details but in a very readable way. The best work on the subject that I've come across so far.

[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.

[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.

[134] Rice. G. (Editor) Growing from Seed. Volume 2. Thompson and Morgan. 1988
Very readable magazine with lots of information on propagation. An interesting article on Ensete ventricosum.

[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.

[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.

[207] Coffey. T. The History and Folklore of North American Wild Flowers. Facts on File. 1993 ISBN 0-8160-2624-6
A nice read, lots of information on plant uses.

[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.

Readers Comments

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