Pterocarpus soyauxii

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In view of the fact that some tree species are invasive, the world Agroforestry Center (ICRAF) has put in place a policy document on Invasive Alien Species, currently under draft available at Here.

For more information on this subject, please refer to
100 of the World's worst Invasive and Alien Species.




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Local names:
English (redwood,large fruited camwood,Gabon padouk,barwood,African padouk,African coralwood)

Pterocarpus soyauxii is a tree 27-34 m tall; bole length up to 17 m, girth up to 3.3 m with an undivided stem. Bark reddish-grey, detaching in flakes, slash white, exuding a red gum.

Leaves compound, unarmed; leaflets 11-13, alternate, lateral leaflet veins crowded but disappearing before leaf margins.

Flowers in pyramidal panicles; calyx turbinate, upper 2 teeth more or less connate, vexillum orbicular or broad-ovate; stamens connate; style curved round towards the base.

Fruit an obliquely orbicular, compressed indehiscent pod, 6-9 cms with numerous prickly thorns.

Pterocarpus is based on the Greek words ‘pteran’ meaning a wing and, ‘karpos’ meaning’ fruit.

Ecology

The tree is native to West Tropical Africa and occurs in mixed deciduous and evergreen forests. It requires much light and moist soils.

Native range
Cameroon, Democratic Republic of Congo, Gabon, Nigeria

Tree management

In West Africa, P. soyauxii is readily propagated from fallen seeds, germination is fast and seedlings grow rather fast too, these are tended in forest until when ready for cutting. The tree requires much light. Stump regrowth is weak and uneconomical for dye production.

Seed storage behaviour orthodox.

The tree is native to West Tropical Africa and occurs in mixed deciduous and evergreen forests. It requires much light and moist soils.

P. soyauxii is readily propagated from fallen seeds.

  P. soyauxii leaves are eaten as vegetables and have a high ascorbic acid content even after cooking.

Timber:  The wood commercially known as ‘African padouk’ (P. osun and P. tinctorius are also marketed under the same name) is of medium weight, very hard and durable, termite resistant, fading blood red in colour, impregnable with preservatives, difficult to plane, can be turned and polished. Used for walking sticks, canoe construction, buildings, wooden shovels, yam pestles and heavy furniture; pulping trials were satisfactory. There is an almost exclusive use of P. soyauxii timber for drums by African craftsmen because of its reputed high resonance qualities.  Redwood is an important lumber export of Cameroon.

Tannin or dyestuff:  Dye from the roots and heartwood is lumbered. Dye extracted by pounding bark in a mortar or in natural holes in rock, the pulverized material is then water moistened and molded for sale as cakes.

Medicine:  Bark extracts are used in warding off animal skin parasites in ethnoveterinary practices. Antifungal properties are reported for this plant.

Nitrogen fixing:  P. soyauxii is nitrogen fixing 

Other services:  The pulverized wood is used as a fetish medicine in medicomagical rites.