Xylopia stenopetala Oliver, Hook. Icon. Pl. 21 t. 1563 (1887)

Description
Mid-canopy tree up to 39 m tall and 81 cm dbh. Stipules absent. Leaves alternate, simple, penni-veined. Flowers with ca. 22 mm long, very narrow petals, yellow, fragrant, placed on twigs. Fruitlets ca. 70 mm long, bean-shaped, red, dehiscent, placed in apocarp.

Ecology
In undisturbed forests up to 980 m altitude, but also quite often in secondary forests along road sides. Mostly in mixed dipterocarp forests, but occasionally found in swamp forest. On sandy to clayey soils, sometimes on limestone. Usually on hillsides and ridges, less frequent on alluvial sites.

Distribution
Sumatra and Borneo (Sarawak, Sabah, West-, East- and South-Kalimantan).

Local names
Borneo: Ako, Sankajang.