Dipterocarpus rigidus Ridl.

Species

Angiosperms > Malvales > Dipterocarpaceae > Dipterocarpus

Characteristics

Twig, petiole, midrib above and leaf beneath shortly densely evenly pale ocherous pubescent, leaf above fugaceously so; leaf bud and stipule outside (glabrous within in mature tree) longer tomentose. Twig to 8 mm ø apically, stout, terete, with slender stipule scars. Bud to 15 by 8 mm, conical, subacute. Stipule to 7 by 1 cm, lorate, subacute. Leaves 13-25 by 8-16 cm, ovate, thickly coriaceous, with broadly cuneate base; acumen to 1 cm long; nerves 12-16 pairs, at 40°-50°; nerves and midrib prominent beneath, depressed above; tertiary nerves scalariform, evident beneath; petiole 3-6 cm long, geniculate. Raceme to 15 cm long, terete, axillary, at first shortly evenly ocherous pubescent towards the base, glabrescent; unbranched or rarely singly branched, bearing distichous flowers at up to 3 cm intervals. Flower bud to 3.5 by 1 cm. Calyx and corolla typical; calyx glabrous. Stamens 24, slightly shorter than the style; filaments narrowly lorate, slightly tapering, exceeding length of anthers; anthers linear, tapering; appendage acicular, c. 1/2 length of the anther. Ovary ovoid, pubescent; style columnar, pubescent except for the apical 1/4. Fruit glabrous. Pedicel 1 mm long, stout. Calyx tube to 5 by 4.5 cm, subglobose, with 5 tubercles (obscure at maturity) in the distal half; 2 longer calyx lobes to 18 by 5 cm, lanceolate to lorate, subacute, to 6 mm broad above the somewhat revolute base; 3 shorter lobes to 8 by 8 mm, suborbicular, revolute.
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Growth form tree
Growth support free-standing
Foliage retention evergreen
Sexuality hermaphrodite
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Photosynthetic pathway c3

Environment

Locally abundant on dry sandy soils on coastal hills.
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Hardiness (USDA) 9-12

Usage

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Cultivation

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Distribution

Dipterocarpus rigidus world distribution map, present in Indonesia and Malaysia

Conservation status

Dipterocarpus rigidus threat status: Critically Endangered

Identifiers

LSID urn:lsid:ipni.org:names:320752-1
WFO ID wfo-0000651417
COL ID 36QWR
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Dipterocarpus rigidus