Description from Flora of China
Uvaria amuyon Blanco, Fl. Filip. 463. 1837; Polyalthia sasakii Yamamoto.
Shrubs or small trees, 2-5 m tall. Petiole 6-8 mm, sparsely pubescent; leaf blade oblong-elliptic to elliptic, 8-16 × 3-5.5 cm, papery, glabrous, abaxially with brown specks, secondary veins 8-11 on each side of midvein and adaxially slightly prominent, base broadly cuneate, apex obtuse. Inflorescences axillary. Pedicel ca. 6 mm. Sepals ovate-triangular, outside pubescent. Outer petals lanceolate, ca. 3.5 × 0.7 cm, thick, outside pubescent; inner petals ovate, smaller than outer petals. Stamens many; connectives broadly 3-angular. Carpels cylindric; ovules 1-3 per carpel; styles linear, ca. 3.5 mm. Fruiting carpels ovoid to ellipsoid, 1-1.8 × 0.6-0.9 cm. Seeds 1 or 2 per monocarp. Fl. May-Jul, fr. Jul-Oct.
Mixed woods; 300-500 m. S Taiwan [Philippines].