Hydnocarpus polypetala (Sloot.) Sleum., Bot. Jahrb. 69 (1938)

Latin for 'many petals'.

Taraktogenos grandiflora Merr.
Taraktogenos polypetala Sloot.

Mid-canopy tree up to 31 m tall and 42 cm dbh. Stipules ca. 9 mm long. Leaves alternate, simple, penni-veined, lower surface covered with red-brown hairs. Flowers ca. 14 mm diameter, white-yellow, placed in cymes. Fruits ca. 56 mm diameter, browninsh, berries/capsules covered by curved, spiny appendages.

Tree 7-20(-30) m; bark pale brown, cracked; young branches, inflorescences and leaves beneath on midrib and nerves +/- densely ferrugineous-pubescent, otherwise glabrous or nearly so. Leaves oblong to elliptic-oblong, rarely lanceolate-oblong, abruptly (1-2 cm) acuminate at the apex, subrounded at the base, slightly inequilateral, subcoriaceous, entire, red-brown and mostly dull when dry, 16-35 by 6.5-11 cm; midrib and nerves little distinct above, very prominent beneath, nerves in 9-12 pairs, curved-anastomosing, veins subparallel, reticulations prominent; petiole 5-8 mm. Stipules oblong-lanceolate, subpersistent, 6-11 by 3 mm. Cymes compact, sometimes 3-4 fasciculate, few-flowered, +/- densely ferrugineous pubescent; peduncle stout, 1 cm. Pedicels 1.3-1.5(-2.5) cm. Male flowers: Sepals 8-10, yellow green, orbicular, very unequal, the 2 outer ones 1.5 cm diam., 2 subsequent ones 2 cm diam., inner ones gradually smaller, all glabrous. Petals white or greenish, 8-12, +/- obovate, unequal, outer ones +/- oblong, c. 1 by 0.8 cm, inner ones orbicular to ovate, nearly glabrous, gradually decreasing in size, 9-7 by 8-5 mm, all fimbriate; scales thick, sulcate, +/- densely brownish-pubescent, 3-4 by 1 x 1.5-3 mm. Filaments slender, glabrous, 1 cm; anthers elliptic, 3-4 mm. Rudiment of ovary pilose, 2 mm. Female flowers as male ones, but staminodes numerous; anthers sterile and slightly smaller in size. Ovary ovoid, ferrugineous-velvety; stigmas 5, radiate, flat, dilated and irregularly bilobed at the apex, blackish. Fruit globose, c. 9 cm diam., densely covered with numerous, irregular appendages, these flat, elongate-triangular and obtuse, softly ferrugineous-tomentose, c. 5-10 mm long, coherent at their bases and forming +/- longitudinal crests. Seeds c. 20, c. 2 by 1 cm. [from Flora Malesiana]

Undisturbed mixed dipterocarp forests up to 600 m altitude. Often on hillsides and ridges, but also on alluvial sites and along rivers. On clay soils, but also on limestone.

Oil is extracted from the seeds.

Sumatra, Borneo.

Local names
Indonesia: Baliutod, Kelapa bout, Merore, Namih, Pagalasong, Senumpel landak, Sigi-baning.