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Psoralea tenuiflora

Common name:	Slender Scurfy Pea	Family:	Leguminosae
Author:	Pursh.	Botanical references:	43, 235
Synonyms:	Psoralidium tenuiflorum ((Pursh.)Rydb.)
Known Hazards:	Although no specific mention of toxicity for this species has been found, at least some members of this genus contain furanocoumarins, these substances can cause photosensitivity in some people[65]. The plant is said t be poisonous to livestock[274].
Range:	N. America - Illinois to South Dakota, Texas, Colorado and Montana.
Habitat:	Dry prairies, open woods and rocky banks[43].
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	0

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	P. floribunda[B,G,P] P. obtusifolia[B,P] P. tenuiflora var. bigelovii[B,P] P. tenuiflora var. floribunda[B,G,P] Psoralidium batesii[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Slender-flower Lemonweed [B], Slimflower Scurfpea [P],
Epithets:	From a Dictionary of Botanical Epithets
	flora = flowered tenuiflora = slender flowered
Systematics:	From a USDA Plants Database
	Order: Fabales. Renamed to Fabaceae -- Pea family
Other Range Info:	From the Ethnobotany Database
	Us(Amerindian)

Physical Characteristics

Perennial growing to 1m. . The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects. It can fix Nitrogen. We rate it 2/5 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 dry or moist soil.

Habitats and Possible Locations

Woodland, Cultivated Beds, Sunny Edge.

Edible Uses

Root.

Root - raw or cooked[105, 161]. It can also be dried, ground into a powder and used in soups or with cereals for making bread etc[61]. One report says that this species does not have a tuberous root[235].

Medicinal Uses

Disclaimer

None known

Other Uses

Soil stabilization.

The plant is a good soil stabilizer in its natural environment[200].

Cultivation details

We have very little information for this species and do not know if it will be hardy in Britain, though judging by its native range it should succeed outdoors in many parts of the country. Some botanists have now renamed this plant, moving it into a new genus as Psoralidium tenuiflorum[274]. The following notes are based on the general needs of the genus.
Succeeds in an ordinary garden soil[1]. Requires a well-drained soil in a sunny position[200].
Plants are very intolerant of root disturbance, they are best planted out into their permanent 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].

Propagation

Pre-soak the seed for 24 hours in warm water and then sow in early to mid spring in a greenhouse. Either sow the seed in individual pots or pot up the young seedlings as soon as possible in order to avoid root disturbance. Grow them on in the pots until planting out in their final positions. It is usually impossible to transplant this species without fatal damage to the root[200].
Division in spring. With great care since the plant resents root disturbance. It is virtually impossible to divide this species successfully[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.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Psoralidium tenuiflorum (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]).

[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.

[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.

[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.

[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.

[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.

[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.

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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