Polyalthia sumatrana (Miq.) Kurz, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 43 (1874)

(Latin for 'of Sumatra')

Synonyms
Guatteria sumatrana Miq.
Maasia sumatrana (Miq.) Mols, Kessler & Rogstad
Monoon sumatranum (Miq.) Miq.
Polyalthia sumatrana (Miq.) King

Description
Sub-canopy tree up to 23 m tall and 25 cm dbh. Stipules absent. Leaves alternate, simple, penni-veined, glaucous below. Flowers with ca. 38 mm long petals, white-yellowish, placed on the twigs. Fruitlets ca. 19 mm long, pink-red-purple, placed in apocarp, fruitlets 1-seeded.

Ecology
In undisturbed forests up to 700 m altitude. Usually in mixed dipterocarp forests, but occasionally also in keranga forests. In alluvial sites, on hillsides and ridges, along rivers and on alluvial sites. Usually on clayey sand soils, but also found on ultrabasic soils. In secondary forests usually present as a pre-disturbance remnant.

Distribution
Thailand, Peninsular Malaysia, Sumatra, Java and Borneo (all over the island).

Local names
Borneo: Buah sasak; Dilah; Dilah saie; Dilasai; Pisang-pisang; Pisang-pisang putih; Selaut.