The Simpor (Dillenia Suffruticosa) tree has large bright yellow petals and large leaves. When fully in bloom, the petals spreading out like an umbrella. The image of the Simpor flower is found on the Brunei one-dollar bank note. It is also widely used in Brunei in art design for traditional handicrafts. The Simpor is commonly found along the rivers in Brunei, especially the Temburong River, and also at swamp or white sand areas. Most parts of the tree have multiple uses, for instance, the treatment of wounds.
More about Simpor here.