Hopea rudiformis Ashton, d. Bull. Sing. 31 (1978)
Latin for 'roughly-shaped'?
Diagnostics
Mid-canopy tree up to 36 m tall and 67 cm dbh. Stem with resin. Stipules
dropped early. Leaves alternate, simple, penni-veined, conspicuous secondary
veins. Flowers ca. 4 mm in diameter, white-yellow, placed in panicles. Fruits
ca. 8 mm long, green, with rwo ca. 56 mm long wings, wind dispersed.
Description
Medium-sized tree. Twigs, leaf buds and parts of
petals exposed in bud densely +/- persistently pale
tawny puberulent; panicles sparsely so; calyx outside
and nerves and midrib beneath sparsely caducously
so. Twigs c. 2 mm diameter apically, rather straight, ribbed,
becoming smooth, dark brown. Bud small, ovoid,
acute; stipules fugaceous, unknown. Leaves 6.5-14 by
3.5-7.5 cm, ovate to broadly lanceolate, thinly coriaceous,
minutely stellate lepidote and appearing pale
and dull beneath: margin subrevolute; base broadly
cuneate; acumen to 1.5 cm long, broad, tapering,
down curved and twisted over on pressing; nerves
11-13 pairs, slender but prominent beneath, +/- obscurely
depressed above, arched, at 55 -65 degrees ; secondary
nerves few, short, hardly elevated beneath; tertiary
nerves densely scalariform, obscure; petiole 8-13 mm
long. Panicle to 3.5 cm long, to 2-axillary; singly
branched, branchlets bearing to 3 flowers; bracts
unknown, fugaceous. Flower bud to 3 by 2 mm, ovoid,
small. Sepals subequal, broadly ovate, subacuminate.
Stamens 15, in 3 subequal verticels; filaments compressed
at base, tapering medially and filiform below
the shortly oblong anthers; appendages slightly longer
than anthers, short, slender. Ovary ovoid, surmounted
by an indistinct tapering ciliate stylopodium,
and short columnar style c. half length of ovary
and stylopodium. Fruit pedicel to 2 mm long, short,
base of ripe fruit +/- impressed. 2 longer calyx lobes to
9 by 2 cm, broadly spatulate, obtuse, c. 3 mm broad
above the to 6 by 5 mm ovate deeply saccate thickened
base; 3 shorter lobes to 8 by 8 mm, ovate, chartaceous
at margin, subacute, reaching apex of nut and
adpressed to it; nut to 8 by 8 mm, ovoid, terminating in
the persistently truncate stylopodium. [from Flora Malesiana]
Ecology
In undisturbed mixed dipterocarp forests up to 200 m altitude. Usually
growing on alluvial sites, but also present on hillsides. On sandy to clayey
soils.
Uses
The timber is used.
Distribution
Borneo.
Local names
Borneo: Damar batu, Damar jankar, Damar putih, Emang bakau, Putang lanan, Selangan
jangkang.
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