Chaetocarpus castanocarpus (Roxb.) Thwaites, Enum. Pl. Zeyl. (1861)

Latin for 'with chestnut like fruits'.

Adelia castanicarpa Roxb.
Chaetocarpus castanocarpus var. genuina Mull.Arg.
Chaetocarpus pungens Thwaites
Gaedawakka castanocarpa (Roxb.) Kuntze
Regnaldia cluytioides Baill.
Regnaldia myrtioides Baill.

Upper canopy tree up to 47 m tall and 78 cm dbh. Stipules ca. 5 mm long, curved. Leaves alternate, simple, penni-veined, glabrous. Flowers ca. 3 mm diameter, yellow-white, placed in dense axillary clusters. Fruits ca. 10 mm long, green, spiny, dehiscent capsule, seeds black with small aril.

In undisturbed mixed dipterocarp and freshwater swamp forests up to 400 m altitude. Mostly on hillsides and ridges, but also alluvial. On clay soils. In secondary forests usually present as a pre-disturbance remnant tree.

Wood sometimes used for non-construction purposes. Young leaves can be eaten as vegetable.

Bangladesh, Sri Lanka, Andaman Islands, Indo-China, Birma, Thailand, Peninsular Malaysia, Sumatra, Borneo (Sarawak, Brunei, Sabah, West-, Central-, South- and East-Kalimantan).

Local names
Borneo: Bukir, Dengin bobok, Dusun bukit, Jamilas, Jentian, Kayu batu, Kayu dusun, Lawang, Masam, Ma-uhi, Medang serukan, Nampadu, Obah nasih, Perupuk batu, Pingas, R'teh-r'teh, Ubar bantan.