| | CITESwoodID: descriptions, illustrations, identification and information retrieval |
Nomenclature. Family: APOCYNACEAE. Other trade relevant species: Dyera polyphylla. Further trade and local names: yeluu-tong, luu-tong (MY); jelutung (ID); teen-pet daeng (TH). Code according to DIN EN 13556: DYCS.
CITES(EU) status of protection. Not protected.
Similar timbers. Easily mistaken for Gonystylus spp. (CITES II).
Geographic distribution. Thailand, Laos, Vietnam, Cambodia and Indomalesia.
Growth rings, colour, grain, etc. Growth ring boundaries indistinct or absent. Heartwood basically yellow, white or grey. Sapwood similar to heartwood colour. Wood light weight and soft (0.32–0.50 g/cm3). Interlocked grain absent.
Hardwood vs softwood. Vessels (pores) present (= hardwood).
Vessels (pores). Wood diffuse-porous. Vessels (pores) arranged in no specific pattern, or a radial pattern; in multiples; commonly in short (2–3 vessels) radial rows, or in radial rows of 4 or more. Vessels medium to large (90–140–160 µm); very few to few (3–10). Tyloses absent. Other deposits in heartwood vessels (pores) absent.
Axial parenchyma. Axial parenchyma present; not banded. Other macroscopically visible types of axial parenchyma: diffuse-in-aggregates (in numerous narrow lines between rays).
Rays. Rays narrow. Large rays commonly less than 1 mm high.
Storied structure. Storied structure absent.
Physical and chemical tests. Heartwood not fluorescent. Water extract not fluorescent; colour shade of water extract colourless to brown. Ethanol extract not fluorescent; colour shade of ethanol extract colourless to brown. Froth test negative. Splinter burns to partial ash; colour of ash white to grey.
Additional information. • Transverse section + wood surface. Dyera costulata (Jelutong). Transverse section ca. 10x. Wood surface, natural size.
The interactive key allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, summaries of attributes within groups of taxa, and geographical distribution.
Cite this publication as: ‘Richter, H.G., Gembruch, K., and Koch, G. 2014 onwards. CITESwoodID: descriptions, illustrations, identification, and information retrieval. In English, French, German, and Spanish. Version: 4th April 2023. www.delta-intkey.com’.
