Adenanthera borneensis Brace ex Prain, in King, J. As. Soc. Beng. 66, 2 (1897)
Latin for 'from Borneo'.
Description
Tree to 39 m high, 100 cm girth. Branchlets glabrous. Stipules not seen. Leaves: - rachis 4-9.5 cm,
slightly laterally compressed, sulcate, glabrous; pinnae 1 or 2 pairs, 4-8 cm, angular, glabrous or
with a few scattered hairs; petiolule 2 mm, glabrous; leaflets 2 or 3 on each side of the pinna,
rigidly chartaceous, drying very glossy olive green above and chestnut brown beneath, ovate-elliptic to
broadly elliptic, 3-6 by 2-3.2 cm, base symmetrical, broadly rounded to subcordate, apex strongly
acuminate, acumen c. 0.6-0.7 cm long, both surfaces glabrous, upper with prominulous veins and
microscopic, reddish brown (when dry) pellucid dots, lower surface with c. 9 prominent, oblique,
parallel veins, connected with a lax reticulation of tertiary veins. Racemes not seen fully developed;
pedicel 1.2 mm, glabrous. Calyx broadly cupshaped, with inconspicuous teeth, minutely hairy
at the mouth. Petals lanceolate, acute, 2.5 mm long, puberulous towards the apex. Stamens c. 4
mm; anthers 0.5 mm long. Ovary 1.5 mm, glabrous; style c. 1.5 mm, tubular. Pod dark brownish,
contorted into a short spiral at dehiscence, to c. 25 cm long and 2 cm wide, slightly sinuate between
the seeds. Seeds up to 16, glossy red with a dark spot, suborbicular to broadly transversely elliptic,
7 by 8 by 5 mm, biconvex, dark spot c. 3 mm high; areole c. 6 by 7 mm, open towards the hilum.
[from Flora Malesiana]
Ecology
In undisturbed mixed dipterocarp forests up to 500 m altitude. Usually on
hillsides. In secondary forests usually present as a pre-disturbance remnant
tree.
Distribution
Borneo.
Local names
Borneo: Pamai.
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