Dyera costulata
Specifications
Family
Apocynaceae
Species
Dyera costulata Hook. f.
Description
Whitish in color, undifferentiated, with a fine texture and straight grain, it has large radially oriented lactic acid channels. Its density varies greatly, from 0.25 to 0.56. It exhibits modest mechanical strength and poor durability.
Plant morphology
An evergreen tree, or semi-deciduous in dry periods, that can exceed 60 m in height. The trunk can reach 3 m in diameter and is covered with smooth, grayish bark; when injured, the plant exudes white latex. The leaves are simple and have very visible veins. The flowers are white, with a tubular corolla, arranged in small umbels. The fruit is a long, indehiscent brown capsule.
Natural occurrence
Countries of origin and distribution
Southeast Asia: Malaysia, Indonesia, Borneo, Sumatra, Thailand.
Habitat and ecology
It grows exclusively in primary forest, above 400 m, on soils with a certain sandy content. If present in secondary forest, it is because it existed before the disturbance.
Uses
Use class
CU1
CU2
CU3
CU4
CU5
Application areas
Used for basic carpentry, furniture frames, picture frames, skirting boards, drawing boards, pencils, matches, plywood veneer.
Threats and Conservation
Threats
Historically, the species has been threatened by deforestation for timber and exploitation for latex, which was previously used in the production of chewing gum.
Conservation measures
It is preserved in several protected areas in Malaysia and Singapore, and in some ex situ collections. The export of its wood is prohibited in Malaysia.
IUCN Red List
IUCN
LC - Least Concern - Low Risk
CITES. Year of assessment
CITES
2023
1975
2050
CITES Italia • Ultimo aggiornamento
2023
Not present.
Technical data
Aesthetic characteristics
Grain
Not obvious
Texture
Medium
Physical and mechanical properties
Density
ρ
ρ
450
kg/m3
Radial shrinkage
Rad. sh.
Rad. sh.
23
MPa
Tangential shrinkage
Tang. sh.
Tang. sh.
55
MPa
Bending strength
M.O.R.
M.O.R.
45
MPa
Modulus of Elasticity
M.O.E.
M.O.E.
10040
MPa
Durability characteristics
Fungal resistance
Not durable
Insect resistance
Not resistant