Tabernaemontana pachysiphon,  is an evergreen tree or large shrub native to Tropical Africa - Ghana to Sudan, south Angola and Tanzania. Its lovely white pinwheel shaped flowers have a sweet fragrance that fills the air. 
This plant's wood is used locally for firewood and creating charcoal. The bark , leaves and fruit have medicinal properties. The latex it produces is applied to wounds to prevent infection. The bark is also used to make cloth.
More information on this plant is available on the Useful Tropical Plants Database website.

This plant lives in the Cool Temperate House.