Dysoxylum pachyrhache Merr., Univ. Calif. Publ. Bot. 15 (1929)
Latin for 'thick stalk or rachis'.
Epicharis pachyrhachis (Merr.) Harms
Mid-canopy tree up to 32 m tall and 62 cm dbh. Stipules absent. Leaves
alternate, compound, leaflets penni-veined, usually densely hairy below. Flowers
ca. 12 mm diameter, white-yellow, placed in racemes. Fruits ca. 100 mm diameter,
Tree to 32 m with clear bole to 10 m, 62 cm diam., sometimes with short buttresses.
Bark smooth with large corky lenticels, chocolate brown, to superficially fissured and
finely cracking; inner bark bright orange, granular; sapwood pale brown; heartwood
brown. Crown with sparse branching, open. Twigs stout, angled with cicatrices, greyish
brown with bright brown lenticels, densely tomentose when young. Leafy twigs
c. 10-15 mm diam.; buds stileto-like. Leaves to 1 m long in terminal spirals; 2-4-jugate
with terminal spike or its scar, petiole 10-16 cm, terete to flattened adaxially,
+/- densely brown tomentose, weakly swollen at base, leaflets +/- alternate, 12-25 by
7-12 cm, elliptic, +/- coriaceous, glabrous except on midrib adaxially, softly pubescent
abaxially, bases somewhat asymmetric, acute to rounded, costae 15-18 on each side,
spreading, inarched but not looped at margin; petiolules 5-11 mm. drying dark brown,
weakly swollen. Thyrses to 8 cm long, usually much less, subspiciform, with congested
branchlets of subsessile weakly scented flowers, axillary, supra-axillary in axils of
leaves or cicatrices; axis 4-6 mm diam., densely pubescent. Calyx 3-4 mm long. 5-6
mm diam., shallowly cupular, densely pubescent without, pale brown, margin irregularly
4-lobed. Petals 4, 8-9 by 3 mm, densely pubescent without, creamish. Staminal
tube glabrous, margin +/- crenate; anthers 8, c. 1.5 mm long, narrowly oblong, inserted
within the tube. Disk c. 2-3 mm tall, glabrous, margin obscurely crenulate. Ovary
4-locular, densely adpressed pubescent; style adpressed pubescent at base; stylehead
subcapitate c. 1 mm diam., with a basal annulus and impressions of stamens. Capsule
solitary or in groups of 2 or 3, 5-8 cm long. c. 5-8 cm diam., subpyriform, glabrous
when ripe, orange-red, stipe 1-1.5 cm, pericarp pale along sutures, to 1.5 cm thick,
ochreous within. Seeds c. 2.5 cm long, orange-segment-shaped with creamy laticiferous
(?) sarcotesta. [from Flora Malesiana]
In undisturbed mixed dipterocarp and sub-montane forests up to 1600 m
altitude. On hillsides and ridges with sandy to clay soils.
Borneo: Injualang, Lantupak, Peleh manuk, Segera.