Macaranga petanostyla Airy Shaw

Small trees up to ca. 18 m tall and 15 cm dbh, reproductive from 3 m tall and 3 cm dbh. Twigs hollow, ant inhabited, glabrous to hairy (short and long simple hairs), with small ant openings (ca. 1 mm diameter). Stipules broadly ovate, usually semi-persistent, recurved, (almost) surrounding the twigs completely, 6-11 mm long by 9-15 mm wide. Petioles glabrous to hairy, up to ca. 30 cm long. Leaves alternate, peltate, 3-lobed, 28-44 cm long by 22-42 cm wide, length/width-ratio 1.03-1.5; secondary veins 11-15, ending in the margin; central lobes 11-20 cm long by 12.5-26 cm wide, lateral lobes 4-10 cm long; leaf base broadly rounded, peltate margin length 4.8-10.5 cm; leaf margin with glands; leaf upper surface glabrous; leaf lower surface glabrous to hairy, not or only sparsely gland dotted. Staminate inflorescences branched; flowers clustered per bracteole, bracteole not enclosing the flowers completely; bracteoles with entire margin. Pistillate inflorescences branched; fruits 10-13 mm wide, 4-5-locular, one glandular patch on each carpel wall, developing into long horn-like appendages.

Ecology: Collected between ca. 800 and 1400 m altitude. An early successional tree species found in disturbed sites in primary forest, and in secondary forests.

Distribution: Endemic for Borneo, where it has so far been collected in Sabah and Sarawak only.