Dryobalanops lanceolata Burck, Ann. Jard. Bot. Btzg. 6 (1887)

Synonyms
Dryobalanops kayanensis Becc.
Dryobalanops oblongifolia Dyer

Diagnostics
Emergent trees up to 69 m tall and 230 cm dbh. Stem with resin. Stipules up to ca. 12 mm long. Leaves alternate, simple, penni-veined, rather narrow and long, secondary veins placed close together. Flowers ca. 14 mm in diameter, white-yellow, placed in panicles. Fruit ca. 15 mm long, green-yellow-red, with five up to ca. 90 mm long wings placed on top of the calyx cup, wind dispersed.

Description
Emergent trees up to 69 m tall and 230 cm dbh. Stem with resin. Leaf bud and stipule sometimes shortly fugaceous tomentose, otherwise entirely glabrous. Twigs 1.5-2 mm apically, slender, dotted with minute pale brown lenticels, smooth but for the prominent ribs above the lateral bundles of the petiole. Bud 4 by 1 mm, narrowly lanceolate. Stipule to 12 by 1 mm, narrowly lanceolate. Leaves 7-10 by 2-3.5 cm, lanceolate, thinly coriaceous, base cuneate, with revolute margin, acumen to 1 cm long, slender; margin frequently undulate; petiole c. 1 cm long, slender. Panicle to 6 cm long; terminal or axillary, ribbed and angular on drying, glabrous; simple or singly branched. Flower bud to 12 by 5 mm, fusiform, obtuse. Calyx glabrous; lobes subequal, lanceolate, obtuse. Corolla white; petals lanceolate, acute, glabrescent. Stamens c. 30, subequal, shorter than the style; filaments compressed, slender, tapering, united at base; anthers linear; appendage to connective short, hardly exceeding anther apex. Ovary small, ovoid, glabrous; style filiform, c. 3 times length of ovary, glabrous. Fruit calyx with to 2 cm diameter, to 5 mm deep, shallow cup at base, impressed at the pedicel; with a shallow tubercle at the base of each calyx lobe; lobes to 9 by 2 cm, spatulate, equal, obtuse, tapering gradually to a 3-5 mm broad base. Nut to 2 cm long and diameter, ovoid to globose, glabrous, subacute. [from Flora Malesiana]

Ecology
Widespread on fertile clay-rich soils, abundant on undulating land on basic volcanics and calcareous shale to 700 m.

Uses
Timber is used. Resin is used as fuel and anti infectant.

Distribution
Borneo.

Local names
Borneo: Adu (Kwijau), Jalam (Dusun), Kapur, Kapur bukit (Brun.), Kapur daram (Brun.), Kapur paji (Iban), Kapur paya, Ngeri (Bassap), Paji (Iban), Sesuan (Murut).