Hydnocarpus anomala (Merr.) Sleumer, Bot. Jahrb. 69 (1926)

Synonyms
Hydnocarpus lasionema Airy Shaw
Taraktogenos anomala Merr.

Diagnostics
Upper-canopy tree up to 45 m tall and 82 cm dbh. Stipules dropped early. Leaves alternate, simple, penni-veined, glabrous to hairy below. Flowers ca. 13 mm diameter, white-yellow, placed in cymes. Fruits ca. 68 mm diameter, brownish, berry/capsule.

Description
Buttressed tree (10-)20-25(-50) m; bark smooth, scaling-off in small irregular pieces; branchlets densely rusty-stellate-pubescent. Leaves oblong or elliptic-oblong (rarely oblanceolate), shortly (1-1.5 cm) cuspidate, +/- rounded to cuneate, rarely subcordate at the base, mostly slightly inequilateral, entire, chartaceous to subcoriaceous, +/- shining and dark-brown when dry, glabrous above, densely to sparsely covered with fine, fascicled or mostly stellate, ferrugineous hairs beneath, specially on midrib and lateral nerves, (10-)15-22(-25) by 5-9 cm; midrib and nerves flat above, very prominent beneath, nerves 5-7(-8) suberect, excurrent at the leaf-margin, veins +/- transverse, slightly prominent above, more so beneath, rather laxly reticulate with venules; petiole +/- densely rusty-stellate-pubescent, 2-3 cm. Male cymes mostly few-flowered, minutely rusty-stellate-puberulous; rhachis stoutish, 1-4 cm long. Pedicels rather slender, l-2.5(-3) cm long, articulated at the base with the very short peduncle. Sepals (4-)5-6(-7), broad-ovate, chartaceous, light-green, outer 2-3 concave, c. 1-1.5 cm diam., glabrous inside, inner ones membranous, smaller, glabrous on both sides but the innermost 1-2 sometimes with a pubescent longitudinal stripe on their back and subpetaloid, always without scales. Petals white, outer ones obovate, 1-1.5 by 0.8 cm, inner ones gradually smaller, 10 by 3-2 mm, all densely covered with appressed, golden sericeous hairs outside, glabrous inside and with a basal, +/- obovate, thick, golden-haired scale 3-5 mm. Stamens 35-50; filaments 6-9 mm, subulate, incrassate at the base and with longish, golden hairs in the lower part, glabrescent towards the apex; anthers oblong-elliptic, 3-4 mm. Female Flowers not yet known. Fruit globose, green, glabrous, 8.5-10 cm diam.; peduncle 2.5 cm long, 1 cm thick; pericarp fibrose. [from Flora Malesiana]

Ecology
In undisturbed mixed dipterocarp forests up to 500 m altitude. Often on hillsides and ridges, but also common along rivers. On sandy to clayey soil.

Uses
Locally used for house construction.

Distribution
Borneo.

Local names
Indonesia: Jangan, Jaui (Kayan), Karpus, Kayu ulan, Oparan bukit, Pajang balaan, Tetek.