Polyalthia rumphii (Bl.) Merr., Enum. Phil. Pl. 2 (1923)
(Named after G.E. Rumpf [1628-1702] a German/Dutch plant and animal collector)

Description
Sub-canopy tree up to 26 m tall and 45 cm dbh. Stipules absent. Leaves alternate, simple, penni-veined. Flowers with ca. 38 mm long petals, green-yellowish, placed on the branches. Fruitlets ca. 8 mm long, green-yellow-purple, placed in apocarp, fruitlets 1-seeded.

Ecology
In undisturbed forests up to 950 m altitude. More or less growing all over the forest, from alluvial sites to hillsides and ridges. Mostly on sandy-clay soils, but also found in limestone areas. Quite often found in disturbed forests, but usually as a pre-disturbance remnant.

Distribution
Peninsular Malaysia, Sumatra, Java, Borneo (Sarawak, Brunei, Sabah, West-, Central-, South- and East-Kalimantan), Philippines, Celebes, Moluccas, New Guinea and the Solomon islands.

Local names in Borneo
Karai, Kenanga, Mempening, Pisang-pisang, Porang-porang, Semukau, Semukau bangkit.