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Rumex venosus

Common name:	Sour Greens	Family:	Polygonaceae
Author:	Pursh.	Botanical references:	43, 200
Synonyms:
Known Hazards:	Plants can contain quite high levels of oxalic acid, which is what gives the leaves of many members of this genus an acid-lemon flavour. Perfectly alright in small quantities, the leaves should not be eaten in large amounts since the oxalic acid can lock-up other nutrients in the food, especially calcium, thus causing mineral deficiencies. The oxalic acid content will be reduced if the plant is cooked. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition[238].
Range:	North-western N. America - Wisconsin to Montana.
Habitat:	Sandy soils[43].
Edibility Rating (1-5):	1	Medicinal Rating (1-5):	2

Other Common Names:	From various places around the Web, may not be correct. See below.
	Veiny Dock [P,B],
Epithets:	From a Dictionary of Botanical Epithets
	venosus = notably veined;
Systematics:	From a USDA Plants Database
	Order: Polygonales. Buckwheat family

Physical Characteristics

Perennial growing to 0.5m. It is hardy to zone 4. It is in flower from July to August. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Wind. We rate it 1/5 for edibility and 2/5 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 can grow in semi-shade (light woodland) or no shade. It requires moist soil.

Habitats and Possible Locations

Cultivated Beds.

Edible Uses

Leaves; Stem.

Young leaves - cooked[105, 161, 177]. Used as greens.
Young stems - cooked[105, 161, 177]. Used like rhubarb[257].

Medicinal Uses

Disclaimer

Astringent; Birthing aid; Blood purifier; Kidney; Poultice; Salve; Tonic; Vulnerary.

The root is astringent, blood purifier and tonic[257]. A decoction has been used in the treatment of diarrhoea, coughs and colds, influenza, pneumonia, stomach aches, kidney disorders, gall bladder problems, venereal disease and rheumatism[257]. An infusion has been given to women to help them expel the afterbirth[257]. The root can be dried, ground into a powder and used as a dressing on burns, wounds, sores etc[207, 257]. A poultice can also be made from the fresh root for use on burns, wounds, sores, swellings etc[207, 257].
An infusion of the stems and leaves has been used as a wash on sores[257].

Other Uses

Dye.

A yellow dye is obtained from the root[207]. The roots are peeled, broken into sections about 25mm long, then spread out thinly in a sunny position until very dry. They are then soaked in water for a few days before being boiled in the same water for a long time. Alum is then added to fix the colour[257]. A red dye is obtained if ashes are added and it turns black if the bark of Cornus stolonifera is also added[207].

Cultivation details

Succeeds in most soils but prefers a deep fertile moderately heavy soil that is humus-rich, moisture-retentive but well-drained and a position in full-sun or part shade[200].

Propagation

Seed - sow spring in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer.
Division in spring.

Suppliers

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

Web References

[V] Images from the Vascular Plant Image Gallery of the Texas A&M Bioinformatics Working Group.
[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.
[C] Taxon data. from the CalFlora database.
Images from the CalPhoto database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for the family Polygonaceae.

[CHINA] Draft 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

[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.

[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.

[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.

[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.

Readers Comments

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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.