Dysoxylum rugulosum King, J. As. Soc. Beng. 64, 2 (1895)
Latin for 'finely ribbed'.
Dysoxylum fulvum Airy Shaw
Dysoxylum undulatum Hend.
Understorey tree up to 20 m tall and 39 cm dbh. Stipules absent. Leaves
alternate, compound, leaflets penni-veined, glabrous. Flowers ca. 15 mm
diameter, yellowish, placed in racemes. Fruits ca. 24 mm diameter, orange-red,
fleshy, dehiscent capsule.
Small tree to 20 m, flowering when a sapling; hole to 39 cm diam. Bark smooth,
brown, to finely fissured and scaling; inner bark yellow-brown, mottled; sapwood
cream. Branches striate, cicatrose. Leafy twigs 4-6 mm diam., fulvous tomentellous
when young; apical hud stiletto-shaped. Leaves 20-40 cm, (1) 2-4 (5)-jugate, with
a temiinal pair of leallets with a scar between them or one leallet and a spike or its scar;
petiole 6-15 cm, +/- finely puberulous, flatened adaxially, conspicuously swollen at
base; rachis angled or weakly winged. Leaflets 10-27 by 2.5-8 cm, the most distal
the largest, oblong-lanceolate, chartaccous to subcoriaceous, rugulose, minutely black
gland-dotted, alternate to sub-opposite, bases acute, attenuate, apices abruptly acuminate,
costae 8-14 on each side, sometimes with domatia in axils, acute to obtuse, arcuate,
prominent abaxially, secondary venation obscure; petiolules 4-10 mm, swollen,
blackish in sicco. Thyrses 1-8 cm, spike-like, supra-axillary; rachis c. 2-3 mm diam.,
puberulous, bearing congested cymules of 3 or 4 sweetly scented flowers;
bracts c. 1 mm, triangular. Calyx c. 2 mm long, 5 mm diam., very shallowly cupular,
puberulous without, shortly 4-toothed. Petals 4, c. 8 by 3 mm, elliptic, puberulous
without, yellowish, valvate. Staminal tube +/- 4-angled, glabrous or sparsely puberulous
on angles without, margin crenate to (7-)8(-9)-toothed, the teeth emarginate; anthers
(7) 8 (9), c. 1 mm long, elliptic, included. Disk c. 2 mm long and in diam., fleshy,
glabrous or +/- pubescent within, margin crenate to c. 8-toothed. Ovary pubescent, 4-locular;
style puberulent in proximal half; stylehead discoid with basal annulus. Capsule solitary
or paired, 3-5 cm long. c. 2-2.5 cm diam., deeply 3- or 4-lobed, glabrous and
orange when mature, drying blackish, veined. Seeds black. [from Flora Malesiana]
In undisturbed mixed dipterocarp and sub-montane forests up to 2200 m
altitude. On hillsides and ridges, but also on alluvial sites near or along
rivers and streams. On sandy to ultramafic soils, but also on clay.
Peninsular Malaysia, Sumatra, Borneo.
Borneo: Segarah, Segera.