Chisocheton lasiocarpus is a species of tree in the genus Chisocheton in the mahogany family Meliaceae. It is a sparsely branched, slightly buttressed, somewhat stout mesocaul or rather slender pachycaul tree of the western New Guinea rainforest rising to 33 m (108 ft) in height, and possibly the only such tree with a weeping habit, the huge terminal rosettes of pinnate leaves 1.5 m long with an 8–15 cm (3.1–5.9 in) petiole, on the lower branches facing down toward the earth. Like all Chisocheton species, C. lasiocarpus has indeterminate leaves with a tiny circinate bud at the tip of each leaf which produces a new pair of leaflets every few weeks or months over a period of several years, each leaf eventually reaching 1.5 m in length. There are 9 to 11 pairs of leaflets at a time. Each leaflet can be up to 45 cm (18 in) long by up to 23 cm (9.1 in) wide. The flowers are white or pink, tubular, about 1 cm (0.39 in) long with 4 or 5 petals and (3–)5–10(–18) stamens. The tree is myrmecophilous. C. lasiocarpus is a highly variable species.