Alstonia macrophylla Wall. ex G.Don., Gen. Syst. 4 (1837)
(Latin for 'large leaves')

Synonyms
Alstonia acuminata Miq.; Alstonia batino Blanco; Alstonia brassii Monach.; Alstonia costata Wall. ex Miq.; Alstonia glabriflora Markgr.; Alstonia macrophylla var. acuminata (Miq.) Monach.;  Alstonia macrophylla var. glabra DC; Alstonia macrophylla var. mollis Merr.; Alstonia oblongifolia Merr.; Alstonia pangkorensis King & Gamble; Alstonia paucinervia Merr.; Alstonia subsessilis Miq.

Description
Sub-canopy tree up to 30 m tall and 50 cm dbh. Stipules absent. Stem with white latex. Leaves in whorls, simple, penni-veined. Flowers ca. 7 mm in diameter, white, with narrow corolla tube, placed terminal on twigs. Fruits ca. 280 mm long, green, dehiscent follicles, which are placed in pairs and filled with many wind dispersed hairy seeds.

Ecology
In undisturbed and disturbed sites up to 500 m altitude. Quite often found near the coast, just behind mangrove forests, but also in mixed dipterocarp forests. Usually on ridges and hillsides with sandy to clayey soils. Also growing on ultrabasic and limestone soils.

Uses
Powdered bark mixed with water is used against skin diseases.

Distribution
Sri Lanka, Nicobar Islands, Thailand, Peninsular Malaysia, Borneo (Sabah and East-Kalimantan), the Philippines, Moluccas, and New Guinea.

Local names in Borneo
Bakau; Bundu-bundu; Mangalang; Pulai daun besar; Sarakad; Sayongan; Tunjang pipit.