Heynea trijuga Sims, in Curtis, Bot. Mag. 41 (1815)
Latin for 'three-yoked'.

Synonyms
Ailantopsis poilanei Gagnep., Azadirachta integerrima M.Roem., Heynea affinis A.Juss., Heynea connaroides (Wight & Arn.) Voigt, Heynea fruticosa Teijsm. & Binn., Heynea quinquejuga Roxb., Heynea sumatrana Miq., Heynea trijuga forma pubescens (Kurz) Craib, Heynea trijuga var. bijuga C.DC., Heynea trijuga var. microcarpa Pierre, Heynea trijuga var. multijuga C.DC., Heynea trijuga var. pilosula C.DC., Heynea trijuga var. velutina Gagnep., Melia integerrima Buch.-Ham., Picroderma laotica Gagnep., Scutinanthe engleri Elmer, Trichilia connaroides (Wight & Arn.) Bentv., Trichilia connaroides forma glabra Bentv., Trichilia connaroides var. microcarpa (Pierre) Bentv., Walsura intermedia Craib, Walsura pallida Craib, Walsura perrottetii C.DC., Walsura pubescens Kurz, Walsura punctata Suess., Walsura quinquejuga Kurz, Walsura sumatrana (Miq.) Harms ex Koord., Walsura tenuifolia Ridl., Walsura trijuga (Sims) Kurz, Walsura trijuga var. genuina Kurz, Walsura trijuga var. pubescens (Kurz) Kurz, Zanthoxylum connaroides Wight & Arn.

Description
Understorey tree up to 19 m tall and 25 cm dbh. Stipules absent. Leaves alternate, compound, leaflets penni-veined, glabrous, whitish below. Flowers ca. 4 mm diameter, white-yellowish, placed in panicles. Fruits ca. 15 mm diameter, pink-red, dehiscent capsules. Seeds with white aril.

Ecology
In open or lightly to severely disturbed sites in mixed dipterocarp and sub-montane forests up to 1700 m altitude. Often along roads but also in secondary regrowth on hillsides and ridges, but also on alluvial sites near or along rivers and streams. On sandy to clay soils.

Uses
Ornamental tree. The bark and leaves are of medicinal value. The seeds are poisonous.

Distribution
India to southern China to Peninsular Malaysia, Sumatra, Borneo (Sarawak, Brunei, Sabah, South- and East-Kalimantan), Philippines.

Local names in Borneo
Buah pasat.