Rauwenhoffia siamensis (Rauwenhoffia)

A small tree closely related to Ylang Ylang, with smaller flowers, greenish in color and highly scented. Narrow leaves and drooping branches. This tree is a good container plant. Relatively problem-free, requires little care. Blooms from spring to fall. Even though the flowers are inconspicuous, a single flower fills the air around (feet away) with pleasant perfume, thus the plant has a high value and is often used in Asian gardens. Shade tolerant, but needs bright light for reliable blooming.

See Article about fragrant plants of Annonaceae.