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Rheum ribes

Common name:		Family:	Polygonaceae
Author:	L.	Botanical references:	93, 200
Synonyms:
Known Hazards:	Although no specific mention has been seen for this species, the leaves of some if not all members of this genus contain significant quantities of oxalic acid and should not be eaten in any quantity. Oxalic acid can lock up certain minerals in the body, especially calcium, leading to nutritional deficiency. The content of oxalic acid 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:	W. Asia - Turkey to Iran.
Habitat:	Dry gorges among rocks, 2300 - 2700 metres[93, 187].
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	0

Other Common Names:	From various places around the Web, may not be correct. See below.
	Raiwas [E], Rawand [E], Rhubarb,Syrian [E], Ribas [E],
Systematics:	From a USDA Plants Database
	Order: Polygonales. Buckwheat family
Other Range Info:	From the Ethnobotany Database
	Europe Iraq Kurdistan

Physical Characteristics

Perennial growing to 1.5m. It is hardy to zone 6. It is in flower from June to July, and the seeds ripen from July to August. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Wind. We rate it 2/5 for edibility and 0/5 for medicinal use.

The plant prefers 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 can grow in semi-shade (light woodland) or no shade. It requires dry or moist soil.

Habitats and Possible Locations

Cultivated Beds.

Edible Uses

Stem.

Leaf stem - cooked[2, 93, 105]. Eaten raw by the local people[187].

Medicinal Uses

Disclaimer

None known

Other Uses

None known

Cultivation details

Prefers a deep, fertile, moderately heavy, humus rich, moisture retentive, well-drained soil in sun or semi-shade[200]. Grows well in heavy clay soils. Best grown in a dry position, where it can be very long-lived[187].
Hardy to about -20° c according to one report[200] whilst another says that plants are somewhat tender in Britain[1].
Plants in this genus seem to be immune to the predations of rabbits[233].
Hybridizes freely with other members of this genus[200].

Propagation

Seed - best sown in autumn in a shaded cold frame[200]. The seed can also be sown in spring in a cold frame. When large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse or cold frame for their first winter, planting them out in the spring.
Division in early spring or autumn[1, 111]. Divide up the rootstock with a sharp spade or knife, making sure that there is at least one growth bud on each division. Larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer.

Suppliers

Plants For A Future is working with the following groups to try and make these plants easily available. Parts of the proceeds will be donated to so please mention us when ordering.

Cool Temperate Nurseries: 10 Ivy Grove
Nottingham
NG7 7LZ
Email: philcorbett53@hotmail.com
Phone 0115 847 8302 Fax 0115 847 8302
Distribution: UK
How to order: Direct from Cool Temperate by email/phone
Notes: Many Trees supplied on their own rootstock
Last Updated: April 03
Item: Ribes
Varities: Black Velvet

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.
[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

[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]).

[2] Hedrick. U. P. Sturtevant's Edible Plants of the World. Dover Publications 1972 ISBN 0-486-20459-6
Lots of entries, quite a lot of information in most entries and references.

[93] Davis. P. H. Flora of Turkey. Edinburgh University Press 1965
Not for the casual reader, this is an immense work in many volumes. Some details of plant uses and habitats.

[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.

[111] Sanders. T. W. Popular Hardy Perennials. Collingridge 1926
A fairly wide range of perennial plants that can be grown in Britain and how to grow them.

[187] Phillips. R. & Rix. M. Perennials Volumes 1 and 2. Pan Books 1991 ISBN 0-330-30936-9
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.

[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.

[233] Thomas. G. S. Perennial Garden Plants J. M. Dent & Sons, London. 1990 ISBN 0 460 86048 8
A concise guide to a wide range of perennials. Lots of cultivation guides, very little 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.

Readers Comments

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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
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