Southern China, Burma, and northern Vietnam
It is a small to medium-sized deciduous growing to 20 m tall, with a spreading crown. The bark is smooth and thin, and bleeds latex if cut. The leaves are alternate, simple, heart-shaped or with three shallow, maple-like lobes, green above and below, red conspicuous glands at the base of the leaf. The flowers are 2.5–3.5 cm diameter, with five pale pink to purple petals with streaks of darker red or purple in the throat; it is monoecious with individual flowers either male or female, but produced together in the inflorescences. The flowers appear before or with the leaves in loose, terminal clusters. The fruit is a hard, woody pear-shaped berry, containing four or five large, oily seeds; it is green initially, becoming dull brown when ripe in autumn (Wikipedia).
Introduced to the US for oil production (Wikipedia).