Dillenia suffruticosa
 Dillenia suffruticosa (Simpoh Ayer) is a species of Dillenia found in tropical South East Asia in secondary forest and swampy ground. It is a large evergreen shrub to 6 metres high. It flowers continuously with yellow flowers 10 to 12 cm wide.Dillenia suffruticosa is national flower of Brunei and can be found everywhere across the country. In Singapore the large oval-shaped leaves of this plant are commonly known as CB leaves.