Alstonia pneumatophora Backer ex Den Berger, Meded. Proefst. Thee 97 (1926)
(Latin for 'with breathing roots')

Synonyms
Alstonia pneumatophora var. petiolata Monach.

Description
Emergent tree up to 85 m tall and 205 cm dbh. Stem with white latex. Stipules absent. Leaves in whorls, simple, penni-veined. Flowers ca. 7 mm in diameter, yellow-white, with narrow corolla tube, placed in panicles. Fruits ca. 240 mm long, green, dehiscent follicle, placed in pairs, filled with many wind dispersed hairy seeds.

Ecology
In undistrurbed and disturbed forests up to 100 m altitude. Usually in swamps (freshwater- and peat-swamp) or alluvial sites.

Distribution
Peninsular Malaysia, Sumatra, Borneo (Sarawak, Brunei, Sabah, East-Kalimantan), and Celebes.

Local names in Borneo
Pulai lilin, Tambaelek.