Dillenia reticulata King, J. As. Soc. Beng. 58, 2 (1889)

Synonyms
Dillenia rhizophora Boerl. & Koord.
Wormia mollissima Boerl.

Diagnostics
Emergent trees up to 63 m tall and 123 cm dbh. Often with stilt roots. Stipules absent. Leaves alternate, simple, penni-veined, secondary veins placed close together, petioles and lower surface densely hairy, margin toothed. Flowers ca. 80 mm in diameter, yellow, placed in composed racemes. Fruits ca. 35 mm long, green-yellowish, indehiscent fleshy capsule, seeds with aril.

Description
Deciduous tree, up to 63 m high, 123 cm diam., with conspicuous stilt-roots. Leaves elliptic or elliptic- oblong to obovate, ca 25-35-nerved, 15-30 by 10-20 cm, with rounded to slightly emarginate apex, obtuse to rounded or cordate base, and entire to slightly undulate-dentate margin. Petiole 4-10 cm long. Inflorescence a (3-)5-10(-15)-flowered composed raceme, forming a loose cluster. Flowers appearing with the leaves, ca 8 cm diam. Sepals 5, broadly elliptic, ca 20-25 by 16-20 mm. Petals yellow, ca 35 by 16 mm. Stamens c? 400-440, all straight in bud, those of the outer whorl ca 11 mm long, those immediately within this whorl 5 mm long, the size gradually increasing towards the centre of the flower to 9 mm in the innermost ones. Carpels 9-10, ca 6 by 1.5 mm, with 5-6 mm long styles, each with 50-70 ovules. Fruit indehiscent, greenish yellow, slightly flattened-globular, ca 35 mm diam, 30 mm high including the enclosing sepals, which are up to 45 by 42 mm, at the base 6 mm thick. Carpels 16 by 8.5 mm, 1-3-seeded. Seeds 3.5 by 2.5 mm, with a rudimentary, ca 0.2 mm long aril. [from Flora Malesiana]

Ecology
Undisturbed forests, including keranga forest, up to 700 m altitude. Growing on alluvial sites with sandy to clayey soils.

Distribution
Peninsular Malaysia, Sumatra, Borneo, Philippines.

Local names
Borneo: Beringin, Simpoh, Simpur, Tempuran.