Hydnocarpus sumatrana (Miq.) Koord., Exk. Fl. Java 2 (1912)
Latin for 'from Sumatra'.
Bergsmia sumatrana Miq.
Hydnocarpus curtisii var. sumatrana Bak.f.
Hydnocarpus hutchinsonii Merr.
Hydnocarpus pentagyna Sloot.
Ryparosa sumatrana Warb.
Upper canopy tree up to 48 m tall and 63 cm dbh. Stipules dropped early.
Leaves alternate, simple, penni-veined, glabrous, base asymmetrical. Flowers ca.
15 mm diameter, green-white, placed in cymes. Fruits ca. 60 mm diameter,
Tree (7-)15-25(-50) m ; tips of branches ferrugineous-sericeous. Leaves oblong or subovate oblong,
rarely lanceolate-oblong, +/- abrupt-acuminate, distinctly inequilateral at base, coriaceous to
subcoriaceous, entire, shining, reddish-brown when dry, glabrous (sometimes very laxly pilose on
midrib and nerves beneath), (13-)15-25(-33) by 5-9(-12) cm; midrib prominent on both sides,
nerves little prominent or slightly impressed above, distinct beneath, veins densely reticulate
and rather prominent on both sides; petiole 1-1.5(-2) cm. Stipules not seen, apparently very
early caducous. Male flowers in 2-4-flowered cymes; peduncles 0.8-1.4 cm, rusty-pubescent.
Pedicels rather slender, 1.5-2 cm, somewhat thickened at the apex, rusty velvety.
Sepals greenish-white, ovate-oblong, ferrugineous-tomentose on both sides, 8-11 by
4-6 mm. Petals oblong, glabrous, 11-13 by 4-5 mm, involute, probably white in vivo, but intensively
red-coloured when dry; scales linear-oblong, fleshy, ciliate, 7-10 by 1.1.5 mm. Filaments
subulate, glabrous, 3-5 mm; anthers oblong, 4 mm. Rudiment of ovary pilose. Female flowers
1-2, c. 1.5-2.5 cm peduncled. Sepals slightly larger than in the 6 flowers, up to 16 by 6 mm,
but petals similar to those in the d flowers. Filaments elongate-deltoid, obtuse, 2 mm, appressed
to the ovary. Ovary ovoid, contracted at the apex, densely fulvous-pilose, distinctly sulcate
lengthwise. Fruit subglobose to ovoid-globose, slightly attenuate and sulcate at the apex
or apiculate, densely fulvous-tomentulose and provided with fine tubercles, 4-6(-8) cm across;
pericarp thin, fragile. Seeds (10-)20-30(-45), irregularly compressed, 2 by 1.5 cm.
[from Flora Malesiana]
In undisturbed mixed dipterocarp and sub-montane forests up to 1200 m
altitude. Mostly on hillsides and ridges with sandy to clay soils, but also on
Sumatra, Java, Borneo, Philippines, Celebes.
Borneo: Lemonuh, Ingleoh, Madansat, Nangka-nangka, Andara.
Indonesia: Kapayang, Mangkulang, Mentada, Tambau.
Java: Limus buntu.
Philippines: Bagarbas, Kamupang, Mangasaluka, Mansaloka, Mangabo, mangasalokag, Tioto, Sugalingayau.
Sumatra: Buntut kaju.