Cratoxylum sumatranum (Jack) Blume, Mus. Bot. Lugd. Bat. 2 (1852)

Synonyms
Ancistrolobus floribundus Turcz.
Cratoxylum arboreum Elmer
Cratoxylum celebicum Blume
Cratoxylum clandestinum Blume
Cratoxylum floribundum (Turcz.) Fern.-Vill.
Cratoxylum hornschuchii Blume
Cratoxylum hypericinum Merr.
Cratoxylum hypericum (Blume) Merr.
Cratoxylum racemosum Blume
Elodea sumatrana Jack

Description
Emergent tree up to 51 m tall and 80 cm dbh. Stem with white to yellow latex. Leaves opposite, simple, penni-veined, glabrous, venation conspicuous. Flowers ca. 8 mm diameter, pink-red-purple, placed in panicles. Fruits ca. 8 mm long, yellow-brown-black, dehiscent capsules, filled with many small winged seeds.

Ecology
Often in disturbed open sites in mixed dipterocarp and scrub vegetations up to 500 m altitude. Most common on hillsides and ridges with clay to sandy soils, but also on limestone.

Uses
Wood used for indoor construction and firewood.

Distribution
Burma, Indo-China, Thailand, Peninsular Malaysia, Sumatra, Java, Lesser Sunda Islands, Borneo (throughout the island), Philippines, Celebes.

Local names
Borneo: Irat, Geronggang, Manding, Mentialing, Serungan, Serungan mampat.