Dipterocarpus acutangulus (PROSEA)
Dipterocarpus acutangulus Vesque
- Protologue: Compt. Rend. Hebd. Séances Acad. Sc. 78: 626 (1874).
- Dipterocarpus tawaensis v. Slooten (1927),
- Dipterocarpus helicopteryx v. Slooten (1940),
- Dipterocarpus appendiculatus auct. non R. Scheffer.
- Brunei: keruing beludu
- Indonesia: mandurian putih, resak lebar daun, sagelam (East Kalimantan)
- Malaysia: keruing beludu (Sarawak, Sabah), keruing butik (Sarawak), keruing merkah (Sabah).
Peninsular Malaysia and Borneo.
The timber is used as keruing.
- A large to very large tree of up to 60 m tall, bole cylindrical, branchless to a considerable height and with a diameter of up to 130 cm, buttresses few, short, rounded, bark surface reddish-brown to grey, inner bark reddish-brown, sapwood light ochre; buds ovoid, densely buff pubescent.
- Leaves elliptical to ovate, or rhomboid, 7-10 cm × 3-6 cm, base obtuse or cuneate, apex with long acumen, secondary veins 7-12(-14) pairs, petiole and leaf beneath caducous densely pubescent, petiole 15-25 cm long, stipules linear, obtuse.
- Fruit calyx tube globose or ellipsoid, with 5 ribs, surface warty, pruinose, 2 larger fruit calyx lobes about 10 cm × 2.5 cm, 3 shorter ones about 5 mm × 5 mm.
D. acutangulus occurs in mixed dipterocarp forest, on sandy soils, on coastal hills and inland ridges up to 1000 m altitude. It is a polymorphic species; some collections have leaf characters intermediate between D. acutangulus and D. globosus. The density of the wood is 690-880 kg/m3at 15% moisture content.
30, 89, 100, 258, 476, 677, 737, 746, 748.
Main genus page
- T. Smitinand (selection of species),
- C. Phengklai (selection of species),
- L.E. Groen (selection of species)