Tree 20 m. Leaves chartaceous, oblong-lanceolate, 8-13.5 by 2.5-3.5 cm, base ± rounded to short-: Male and female flowers not seen, but perianth apparently 3-lobed as judged from the perianth scars on the fruits. Fruits ovoid-ellipsoid, 2.8-3.2 by 2.1-2.5 cm, glabrous, drying dark brown, not tubercled nor lenticellate;
From both the general habit of the specimens, and especially the leaves with! the nerves raised above, H. disticha belongs to the H. polyspherula group. Horsfieldia disticha differs from H. ridleyana of this group in its general habit, the raised nerves, the j longitudinally cracking of the bark on the twigs, and the much larger fruits with a con- j spicuously thick pericarp. The twigs have remarkedly conspicuous, pale, scattered lenticels, contrasting with the dark bark. The available male inflorescences are too immature to describe, but they possibly will not grow longer than 3 cm. They have ovate to elliptic bracts 4(-5) mm long which have, like the inflorescences, dense shaggy rusty-red hairs up to 0.5 mm long. The immature male buds including pedicels hardly reach 1 mm; they are 3-lobed, glabrous, and possibly will resemble those of, e.g., H. polyspherula.