Dillenia suffruticosa, also known as simpoh air, simpor, or CB leaf, is a species of Dillenia found in tropical South East Asia in secondary forest and swampy ground. It is a highly invasive weed in Sri Lanka.

The simpor is the national flower of Brunei, and can be found everywhere across the country. Claire Waight Keller included the plant to represent the country in Meghan Markle's wedding veil, which included the distinctive flora of each Commonwealth country.

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