Dipterocarpus humeratus (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus humeratus v. Slooten

Protologue: Bull. Jard. Bot. Buitenzorg, sér. 3, 8: 308, f. 4 (1927).

Synonyms

• Dipterocarpus gibbosus v. Slooten (1927),
• Dipterocarpus ursinus v. Slooten (1961).

Vernacular names

• Brunei: keruing latek bukit, keruing latek (Malay), ran (Iban)
• Indonesia: jelatong bulan, lagan (Sumatra)
• Malaysia: keruing kerukup (Sabah), keruing latek bukit (Sarawak).

Distribution

Northern and eastern Sumatra and Borneo.

Uses

The timber is used as keruing.

Observations

• A large tree of up to 50 m tall, bole tall, straight, cylindrical, up to 110 cm in diameter, buttresses up to 2 m tall, up to 8 cm thick, bark surface pink-brown, smooth, outer bark thin, inner bark dull pinkish-brown, sapwood pale ochre; buds narrowly conical, fulvous tomentose.
• Leaves broadly ovate, 20-38 cm × 12-23 cm, base obtuse, apex obtuse to shortly acuminate, secondary veins about 20 pairs, beneath persistently shortly pubescent, petiole 4-6 cm long, stipules narrowly lanceolate, obtuse, outside long fulvous tomentose.
• Stamens about 40.
• Fruit calyx tube globose, glabrous, with 5 obtuse tubercles, 2 longer fruit calyx lobes up to 18 cm × 5 cm, 3 shorter ones up to 1.5 cm × 1.5 cm.

D. humeratus occurs scattered or semi-gregariously on undulating land and clay ridges below 700 m altitude. The density of the wood is 730-800 kg/m³at 15% moisture content.

Selected sources

30, 31, 258, 469, 476, 737, 746, 748.

Main genus page

• Dipterocarpus (Timbers)

Authors

• T. Smitinand (selection of species),
• C. Phengklai (selection of species),
• L.E. Groen (selection of species)