Tree 7-27 m. Twigs 5-8 mm diameter, with dense felty to woolly rusty or reddish brown hairs 1-1.5 mm, late glabrescent; bark coarsely striate, ± cracking and flaking; lenticels only in the older wood, large, not contrasting in colour. Leaves chartaceous, (elliptic-)oblong, (18-)24-36 by 8-14 cm, base rounded to attenuate, apex acute-acuminate; upper surface drying dull olivaceous to blackish brown, early glabrescent, lower surface with dense rusty or red-brown hairs 1-1.5 mm long; dots present; midrib slender, flat above, late glabrescent; nerves 18-23 pairs, slender, flat or sunken, lines of interarching not very distinct; venation lax, faint; petiole 15-25 by 5-7 mm, pubescent; leaf bud 25-30 by 7-9 mm, with hairs 1-1.5 mm long. Inflorescences behind the leaves, with dense ± shaggy hairs 0.5-1.5 mm long; in male: 5-8 by 5 cm, many-flowered, 3 or 4 times branched, peduncle 0.2-1 cm long; in female: a short, irregularly shaped, woody knob (as in some Knemas), 1 cm long; flowers (male) solitary or in loose clusters of up to 15, glabrous, perianth 3-(or 4-)lobed, pedicel not articulated; bracts ovate-oblong, acute, densely pubescent outside, 3-7 mm long, caducous. Male flowers: pedicel 1-1.5 mm long, slender; buds somewhat depressed-globose, 1 by 1.2—1.3(—1.4) mm, cleft c. 1/3 to nearly 1/2, lobes 0.2 mm thick; androecium depressed-globose, at apex with a 3-(or 4-)radiate crack, 0.5-0.6 by 0.8-1 mm (Plate 2: 51); thecae 24 or 26, closely pressed, completely sessile, the apical parts overarching the apical hollow; column broadly saucer-shaped, with a broad hollow to ± halfway; androphore narrow, 0.1-0.2(-0.3) mm long, largely hidden by the anthers. Female flowers (from remnants under fruits): 3 mm long, with sparse hairs 0.3 mm long, cleft nearly 1/2, lobes 0.3 mm thick; ovary pubescent. Fruits 1—3(—15) per infructescence, broadly ellipsoid to globose, 1.6-1.8 by 1.5-1.7 cm, with dense shaggy rusty hairs 2 mm long; pericarp ± woody, 1.5 mm thick; seeds broadly ellipsoid, 10 mm long; fruiting pedicel to 1 mm long; perianth not persistent.
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