Kopsia arborea Blume
Blume, C.L. von (1823) Catalogus : 13. Type: Mt Salak, Java, C. Blume s. n.
Grows as a small tree not exceeding 30 cm dbh, occasionally flowers and fruits as a shrub.
Petioles and twigs produce a milky exudate. Leaf blades about 10-20 x 5-8 cm, petioles about 1-1.5 cm long. Lateral veins about 10-15 on each side of the midrib. Numerous bristle-like hairs at the base of each petiole, between the petiole and the twig. A gland is usually visible on the underside of the leaf blade almost at the apex of the acuminate tip.
First pair of leaves elliptic, glabrous, margins smooth. At the tenth leaf stage: leaves elliptic to obovate, apex acuminate, base cuneate to attenuate, glabrous on the upper surface, midrib grooved on the upper surface. All plant parts produce a copious milky exudate when cut or damaged. Midrib raised on the upper surface of the leaf blade. Numerous brown or black glandular bristles visible between the base of the petiole and the stem. Seed germination time 10 to 18 days.
This species has horticultural potential as it produces decorative flowers which are faintly but pleasantly perfumed.