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Useful Tropical Plants

Physostigma venenosum

Balf.

Fabaceae

+ Synonyms

Common Name: Calabar Bean

Physostigma venenosum
Illustration of the leaves, flowers, fruits and seed
Photograph by: Franz Eugen Köhler, Köhler's Medizinal-Pflanzen
Public domain

General Information

Calabar bean is an evergreen, scrambling or climbing shrub producing woody stems up to 15 metres long that twine around other plants for support. The stems are around 1cm in diameter[
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.
].
A highly poisonous plant, it was formerly used as an ordeal poison to determine guilt in accused people. It also has a number of medicinal applications, but is more commonly grown for the alkaloids contained in the seeds which are extracted and used in modern medicine[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
,
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.
]. The seeds are normally gathered from the wild, though some cultivation is practiced, particularly in India[
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.
].

Known Hazards

The seed is highly poisonous[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
]. It used to be used in Nigeria in an 'ordeal by poison' where a suspected criminal had to drink a solution of the beans - if it killed them they were guilty but if they survived they were innocent[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
]. This probably worked to a certain extent in as much as innocent people were more likely to consume the drink in one gulp and then vomit before too much of the toxin had been absorbed, whilst guilty people were more likely to sip it slowly and cautiously, thereby ensuring that more of the toxins were absorbed[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
].

Botanical References


Range

West tropical Africa - Sierra Leone to Gabon and DR Congo.

Habitat

Closed rain-forests, primary and secondary, dry and wet; riparian seasonally flooded forest; marshes[
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 *  *
HabitEvergreen Climber
Height10.00 m
Cultivation StatusCultivated, Wild

Cultivation Details

Requires a minimum temperature of 15 - 18°c[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
].
Prefers a sunny position in a rich, well-drained soil[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
].

Edible Uses

None known

Medicinal

Although highly poisonous, the seed has a number of medicinal applications[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
]. It is a narcotic herb that depresses the central nervous system, mimics the para-sympathetic nervous system, contracts the pupil of the eye, raises blood pressure and stimulates peristalsis[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
].

The seed contains a number of alkaloids including physostigmine, which has been shown to influence the para-sympathetic nervous system[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
].
Physostigmine is isolated from the seed and used in eye drops to reduce pressure on the eyeball in treating conditions such as glaucoma[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
]. It is also prescribed for internal use in the treatment of neuromuscular diseases, especially myasthenia gravis, and for treating post-operative constipation[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
].

The whole seed is used in herbalism, but should only be prescribed by qualified practitioners[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
]. It has been used in the treatment of conditions such as tetanus, epilepsy and rheumatism[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
]. Used in excess, it causes muscular weakness, respiratory failure and cardiac arrest[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
].

Other Uses

None known

Propagation

Seed - best sown when ripe[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
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.
].

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