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Useful Tropical Plants

Indigofera coerulea

Roxb.

Fabaceae


This species has been much confused with Indigofera articulata Gouan.[
328
Title
African Flowering Plants Database
Publication
 
Author
 
Website
http://www.ville-ge.ch/musinfo/bd/cjb/africa/recherche.php
Publisher
Conservatoire et Jardin Botaniques.
Year
0
ISBN
 
Description
Contains information on over 150,000 plant names (including synonyms) giving a description and habitat, plus a distribution map.
].

+ Synonyms

Common Name:

Indigofera coerulea

General Information

Indigofera coerulea is a stout shrubby semi-woody herb or shrub that can grow up to 2 metres tall[
328
Title
African Flowering Plants Database
Publication
 
Author
 
Website
http://www.ville-ge.ch/musinfo/bd/cjb/africa/recherche.php
Publisher
Conservatoire et Jardin Botaniques.
Year
0
ISBN
 
Description
Contains information on over 150,000 plant names (including synonyms) giving a description and habitat, plus a distribution map.
,
332
Title
The Useful Plants of West Tropical Africa.
Publication
 
Author
Burkil. H. M.
Publisher
Royal Botanic Gardens; Kew.
Year
1985 - 2004
ISBN
 
Description
Brief descriptions and details of the uses of over 4,000 plants. A superb, if terse, resource, it is also available electronically on the Web - see http://www.aluka.org/
].
Indigo, of which this species is a secondary source, has a very long history of use as a dye. Because of its fascinating deep blue colour, its great colour fastness to light and the wide range of colours obtained by combining it with other natural dyes, it has been called 'the king of dyes' and no other dye plants have had such a prominent place in as many civilizations as this genus. It was at one time widely cultivated for this purpose but, with the advent of synthetic dyes, demand for the plant dropped dramatically[
317
Title
Mansfeld's Database of Agricultural and Horticultural Plants
Publication
 
Author
 
Website
http://mansfeld.ipk-gatersleben.de/pls/htmldb_pgrc/f?p=185:3:4292127278597336
Publisher
 
Year
0
ISBN
 
Description
Terse details of a huge range of useful plants.
]. It is still sometimes grown for indigo in drier areas[
299
Title
Protabase - Plant Resources of Tropical Africa.
Publication
 
Author
 
Website
http://www.prota.org
Publisher
 
Year
0
ISBN
 
Description
An excellent on-line database with detailed information on over 3,200 species of useful plants of Africa.
].

Known Hazards

None known

Botanical References

500
Title
Flora of Somalia
Publication
 
Author
Thulin M. (Editor)
Publisher
Kew Publishing, London.
Year
1993
ISBN
 
Description
Detailed information on the plants of the region, often adding notes on the plants uses.

Range

Africa - Egypt, Niger, Chad, Sudan, Eritrea, Ethiopia, Uganda, Djibuti, Somalia, Kenya; through the Arabian Peninsula to Pakistan, India, Sri Lanka.

Habitat

Subdesert and open Acacia - Commiphora bushland; sandy-clayey hollows, humid or flooded; dry grassland; roadsides; coastal arid plains; at elevations from 200 - 2,700 metres[
328
Title
African Flowering Plants Database
Publication
 
Author
 
Website
http://www.ville-ge.ch/musinfo/bd/cjb/africa/recherche.php
Publisher
Conservatoire et Jardin Botaniques.
Year
0
ISBN
 
Description
Contains information on over 150,000 plant names (including synonyms) giving a description and habitat, plus a distribution map.
].

Properties

Medicinal Rating *  *
Other Uses Rating *  *  *
HabitShrub
Height1.00 m
Cultivation StatusCultivated, Wild

Cultivation Details

A plant of arid and semi-arid tropical and subtropical areas, where it is found at elevations from 200 - 2,700 metres. It can be found in areas where the mean annual rainfall is as low as 200 - 250mm[
299
Title
Protabase - Plant Resources of Tropical Africa.
Publication
 
Author
 
Website
http://www.prota.org
Publisher
 
Year
0
ISBN
 
Description
An excellent on-line database with detailed information on over 3,200 species of useful plants of Africa.
].

Edible Uses

None known

Medicinal

The dried, ground up leaves and roots are used as a wound dressing[
299
Title
Protabase - Plant Resources of Tropical Africa.
Publication
 
Author
 
Website
http://www.prota.org
Publisher
 
Year
0
ISBN
 
Description
An excellent on-line database with detailed information on over 3,200 species of useful plants of Africa.
,
332
Title
The Useful Plants of West Tropical Africa.
Publication
 
Author
Burkil. H. M.
Publisher
Royal Botanic Gardens; Kew.
Year
1985 - 2004
ISBN
 
Description
Brief descriptions and details of the uses of over 4,000 plants. A superb, if terse, resource, it is also available electronically on the Web - see http://www.aluka.org/
].

An extract of the leaves is drunk as a remedy for constipation and is applied as a wash against infected eyes[
299
Title
Protabase - Plant Resources of Tropical Africa.
Publication
 
Author
 
Website
http://www.prota.org
Publisher
 
Year
0
ISBN
 
Description
An excellent on-line database with detailed information on over 3,200 species of useful plants of Africa.
].

Other Uses

All the above-ground parts of the plant are a source of the dye indigo, which is used to colour textiles blue. The leaves and twigs do not actually contain indigo but colourless precursors that must be extracted and then processed in order to produce the indigo dye[
299
Title
Protabase - Plant Resources of Tropical Africa.
Publication
 
Author
 
Website
http://www.prota.org
Publisher
 
Year
0
ISBN
 
Description
An excellent on-line database with detailed information on over 3,200 species of useful plants of Africa.
].
The harvested leafy branches are placed in a tank containing water to which some lime has been added, and are weighted down with planks[
303
Title
World Agroforesty Centre
Publication
 
Author
 
Website
http://www.worldagroforestry.org/
Publisher
 
Year
0
ISBN
 
Description
An excellent online database of a huge range of trees giving very good information on each plant - its uses, ecology, identity, propagation, pests etc.
]. After some hours of fermentation, during which enzymic hydrolysis leads to the formation of indoxyl, the liquid is drained off and then stirred continuously for several hours to stimulate oxidation of the indoxyl[
303
Title
World Agroforesty Centre
Publication
 
Author
 
Website
http://www.worldagroforestry.org/
Publisher
 
Year
0
ISBN
 
Description
An excellent online database of a huge range of trees giving very good information on each plant - its uses, ecology, identity, propagation, pests etc.
]. Afterwards the solution is left to rest and the insoluble indigo settles to the bottom as a bluish sludge[
303
Title
World Agroforesty Centre
Publication
 
Author
 
Website
http://www.worldagroforestry.org/
Publisher
 
Year
0
ISBN
 
Description
An excellent online database of a huge range of trees giving very good information on each plant - its uses, ecology, identity, propagation, pests etc.
]. The water is drained and after the indigo has dried, it is cut into cubes or made into balls[
303
Title
World Agroforesty Centre
Publication
 
Author
 
Website
http://www.worldagroforestry.org/
Publisher
 
Year
0
ISBN
 
Description
An excellent online database of a huge range of trees giving very good information on each plant - its uses, ecology, identity, propagation, pests etc.
].
To dye textiles, indigo is reduced to a soluble form by a fermentation process under alkaline conditions. In traditional preparations of the dye, various reducing agents such as molasses are used, together with coconut-milk, bananas and the leaves of Psidium guajava[
303
Title
World Agroforesty Centre
Publication
 
Author
 
Website
http://www.worldagroforestry.org/
Publisher
 
Year
0
ISBN
 
Description
An excellent online database of a huge range of trees giving very good information on each plant - its uses, ecology, identity, propagation, pests etc.
]. The alkalinity is maintained by adding lime. After the textile has been dipped into solution it turns blue when exposed to the air[
303
Title
World Agroforesty Centre
Publication
 
Author
 
Website
http://www.worldagroforestry.org/
Publisher
 
Year
0
ISBN
 
Description
An excellent online database of a huge range of trees giving very good information on each plant - its uses, ecology, identity, propagation, pests etc.
].

Propagation

Seed - it has a hard seedcoat and may benefit from scarification before sowing in order to speed up and improve germination. This can usually be done by pouring a small amount of nearly boiling water on the seeds (being careful not to cook them!) and then soaking them for 12 - 24 hours in warm water. By this time they should have imbibed moisture and swollen - if they have not, then carefully make a nick in the seedcoat (being careful not to damage the embryo) and soak for a further 12 hours before sowing.

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