Luzon Twin-Seed is a shrub 1-2 m tall, erect, hairless
except for flowers. It is named for Luzon, the largest Philippine
island. Leaf-stalks are 0.6-2 cm; leaf blade oblong to broadly
elliptic, 9-16 x 3-7 cm, membranous, yellowish when dry, secondary
veins 7 or 8 on each side of midvein, base rounded, tip pointed to
blunt. Flowers are borne leaf-opposed, 1 or 2. Flowers are about 1.2
cm, flower-stalk about 6 mm. Sepals are rounded to ovate, outside
finely velvet-hairy. Petals are greenish; outer petals ovate, slightly
longer and about 2 times broader than inner petals; inner petals 8-9 x
4-5 mm. Stamens are many. Monocarp stipes are club-shaped; monocarps
2-3 x 0.5-0.7 cm, splitting on dorsal side, tip pointed. Seeds reddish
when young, shiny dark brown upon maturity, obovate, flat, 8-11 x 6-7
mm. Luzon Twin-Seed is found on densely forested slopes, at altitudes
of 500-700 m, in SE Asia, Andaman & Nicobar Islands and Sri Lanka.
Flowering: June-October.