Hopea pachycarpa (F.Heim) Symington

Species

Angiosperms > Malvales > Dipterocarpaceae > Hopea

Characteristics

Young twig, leaf bud, stipule outside (glabrous within) and petiole shortly persistently pale fawn tomentose; leaf glabrous. Twig to 2 mm ø apically, terete, becoming smooth. Bud to 2.5 by 2 mm, ovoid to globose. Stipule to 4 mm long, linear, fugaceous. Leaves 13-22 by 4-7 cm, thinly coriaceous, elliptic to lanceolate, with or without silvery lepidote undersurface; base subequal, cuneate on one side, obtuse on the other; acumen to 1 cm long, narrow; nerves (10-)13-17 pairs, slender but distinctly raised beneath, at 45°-55° but curving round to run parallel to the margin before terminating at it, with small tomentose domatia; tertiary nerves slender, densely scalariform, sinuate, diagonal to nerves; midrib rounded, raised on both surfaces; petiole 7-10 mm long, short, stout. Panicle to 8 cm long, axillary to ramiflorous, terete, puberulent or glabrescent, to 2-axillary, rarely branched; bracteoles to 2 mm long, linear, not at first caducous. Flower bud to 4 by 2.5 mm, broadly ellipsoid. Calyx glabrous but for the fimbriate margin; 2 outer lobes broadly ovate, subacute; 3 inner lobes broader, slightly shorter, subacu-minate. Petals broadly oblong, glabrescent, strongly contorted in bud. Stamens 15, in 3 unequal verticils, the 5 inner an anther's length longer than the 10 outer; filaments broad at base, tapering, filiform distally; anthers subglobose; appendage to connective slender, 2-3 times length of anther, glabrous. Ovary small, ovoid, glabrous; style and stylopodium spindle-shaped, glandular-papillose towards apex, tapering into short glabrous style. Fruit entirely glabrous. 5 calyx lobes subequal, to 2 by 1.5 cm, ovate, subacute, thickened, deeply saccate, closely adpressed to nut; apex of nut visible only at 5 mm ø apical gap. Nut to 1.5 cm ø, subglobose; style remnant short, abrupt, acute.
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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 moist soils on lower hillsides and alluvium in mixed Dipterocarp forest.
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Hardiness (USDA) 9-12

Usage

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Cultivation

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Distribution

Hopea pachycarpa world distribution map, present in Brunei Darussalam, Indonesia, India, and Malaysia

Conservation status

Hopea pachycarpa threat status: Vulnerable

Identifiers

LSID urn:lsid:ipni.org:names:320968-1
WFO ID wfo-0000724621
COL ID 3MJGB
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Hopea pachycarpa Balanocarpus pubescens Hopea laxa Hopea resinosa Pierrea pachycarpa