Hopea rugifolia

Hopea rugifolia is a tree in the family Dipterocarpaceae, native to Borneo. The specific epithet rugifolia means 'wrinkled leaf', referring to the dried leaf.

Description
Hopea rugifolia grows up to 20 m tall, with a trunk diameter of up to 20 cm. It has buttresses and stilt roots. The bark is smooth. The papery leaves are lanceolate and measure up to 9 cm long. The inflorescences measure up to 4 cm long and bear up to six purple flowers. The nuts are egg-shaped and measure up to 1 cm long.

Distribution and habitat
Hopea rugifolia is endemic to Borneo. Its habitat is lowland dipterocarp forests, at elevations of 100–800 m.