Castanopsis evansii Elmer, Leafl. Philip. Bot. 5 (1913)
Named after J.H. Evans, governor of Puerta Princesa on the island Sibuyan, Philippines.
Castanopsis elmeri Merr.
Castanopsis woodii Merr.
Tree with smooth bark. Twigs hairy, later glabrous, sparsely lenticelate. Stipules triangular, 6 by 2 mm,
dropped early. Petiole with distinctly swollen base, 1-2.5 cm long. Leaves elliptic, widest near the
middle, up to 17 by 5.5 cm, lower surface dull greenish-white, with 11-14 secondary veins. Fruits
completely enclosed by spiny cupule, ca. 4 cm, splitting irregularly, spines 10-23 mm long.
Tree, 5-32 m by 15-52 cm diameter; bark grey, smooth. Branchlets initially with some tomentum, soon
glabrescent, slender, smooth or finely fissured, rather glossy dark purplish brown, sparsely lenticellate;
terminal bud ovoid-globose 3-5 by 3 mm, scales ovate-acute, 3 by 2 mm. Stipules triangular,
5-6 by 2 mm, rarely persistent. Leaves 10-17 by 3.5-5.5 cm (index 2.3-3.4), widest about the
middle; base tapering to rarely rounded and abruptly acute, apex bluntly acute to 0.5-l cm
acuminate with sharp tip; surfaces green to brownish, above more or less glossy, glabrous, beneath
duller and mostly greyish with wax in which adpressed stellate scales are mostly discernible
(magnification 60!) with very sparse longer hairs mostly only on the nerves; midrib strongly prominent
beneath, slightly so above; nerves 11-14 pairs at an angle of 60-70 degrees, parallel, ascending,
arcuating towards the margin, slightly prominent beneath, flattish above; reticulation fine, dense,
scalariform; petiole 1-2.5 cm, adaxially flat. Male rachis 10-15 cm, 1-2 mm diameter, bracts ovate-acute,
1.5 by 1 mm, bracteoles 1 by 0.7 mm; male flowers in clusters of 3; perianth lobes 4-6, connate at the
base only, 1-1.5 by 0.7-1 mm, ovate-acute, densely hairy, stamens 10-12, filaments l.5-2.5 mm, anthers
0.2-0.25 mm, pistillode 1.5 mm diameter. Female rachis 5-10 cm, bracts ovate-acute, 1 by 1 mm; female
flowers solitary, perianth deeply 6-lobed, the lobes 1 by 0.7 mm, densely hairy; staminodes 12,
rudimentary, styles 3, recurved, conical, 1-2 mm long. Young infructescence c. 10 cm long, carrying
numerous solitary cupules. Young cupule ovoid, bearing short, simple spines on the rounded lateral sides,
and scales on the median sides. Ripe cupule 0.5 cm stalked, obovoid-ellipsoid, 4-4.5 by 3-3.5 cm;
wall 2-4 mm thick, inside brown tomentose, outside with some brownish puberulence, otherwise
glabrous, spines sparsely to densely set sparsely puberulous, sturdy and blackish to slender and
rather soft and brownish, in bundles, often branched in the basal part with the branches reflexed,
10-23 mm long in all; dehiscence none or irregular. Fruit solitary, ovoid, adaxially flat or depressed,
3-3.5 by 2-3 cm, wall 2-3 mm thick, woody, adnate to the cupule; cotyledons flat-convex.
In undisturbed mixed dipterocarp and coastal forests up to 500 m altitude.
Usually on hillsides and ridges with sandy soils, but also brown and clayey soils.
The timber is used for construction and furniture.
Borneo: Berangan, Berangan tambur, Buling, Katungging, Kumpat, Mempening, Pening-peningan.