Dillenia suffruticosa
Large yellow-flowered shrub and national flower of Brunei
Dillenia suffruticosa is a tall evergreen shrub native to tropical Southeast Asia, known for its large yellow flowers that bloom before sunrise. It grows in swamps, riversides, and secondary forests, and is the national flower of Brunei. Its leaves are used for wrapping food and in traditional medicine.
- National flower of Brunei
- Large yellow flowers bloom before sunrise
- Leaves used to wrap food and in traditional medicine
- Invasive weed in Sri Lanka
- Fruits eaten by birds and monkeys
What does Dillenia suffruticosa look like?
Dillenia suffruticosa is a large evergreen shrub or small tree, reaching 6 to 10 metres tall. Its trunk is thick and it often forms dense thickets. The leaves are simple, large, and arranged alternately, with young leaves fuzzy underneath. The flowers are bright yellow, 8–13 cm wide, and hang down on long stalks. They have no scent and lack nectar. After pollination, the flowers turn upwards to form pink, star-shaped fruits with scarlet pulp and seeds covered in bright red arils.
Where does Dillenia suffruticosa come from?
This plant is native to tropical Southeast Asia, including Peninsular Malaysia, Sumatra, Java, Borneo, Singapore, and Sri Lanka. It grows wild in secondary forests, swamps, mangroves, riversides, and sometimes on hillsides up to 700 metres altitude. It prefers undisturbed, clayey to sandy soils. In Hawaii, it is an introduced species. The simpor is widespread in Brunei, where it is a national symbol.
When and how Dillenia suffruticosa blooms
Dillenia suffruticosa begins to flower after three to four years. Its yellow blooms open daily around 3 am, fully opening before sunrise. The flowers are pollinated by bees, beetles, and flies. After pollination, the flowers turn upwards and develop into fruit over about five weeks. The plant is often grown as an ornamental shrub and can be propagated from seeds.
How Dillenia suffruticosa is used
The simpor is planted as an ornamental and used to attract birds in urban gardens. Its large leaves are traditionally used to wrap food like tempeh or shaped into cones to hold dishes such as rojak. In local medicine, the leaves and roots are used for inflammation, itch, stomach ache, and postnatal recovery. The fruit is eaten by birds and monkeys.
Kinds of Dillenia suffruticosa
There are no notable cultivated varieties mentioned, but the plant is known by several local names such as simpoh air and simpor. It is considered highly invasive in Sri Lanka, where it spreads aggressively in suitable habitats.
What Dillenia suffruticosa means
Dillenia suffruticosa is the national flower of Brunei and appears widely across the country. It was chosen to represent Brunei in the wedding veil of Meghan Markle, symbolizing the country's identity. In Sri Lanka, it is considered a problematic invasive species. The plant is also valued for its practical uses in daily life and traditional medicine.
Questions people ask about Dillenia suffruticosa
Where does Dillenia suffruticosa come from?
Dillenia suffruticosa is native to tropical Southeast Asia, including Malaysia, Singapore, Sumatra, Java, Borneo, and Sri Lanka. It is also found in Hawaii as an introduced species.
What does the flower of Dillenia suffruticosa look like?
The flower is bright yellow, 8–13 cm wide, and hangs down on a long stalk. It has no scent or nectar and blooms before sunrise.
What is Dillenia suffruticosa used for?
Its leaves are used to wrap food and make cones for serving dishes. In traditional medicine, leaves and roots are used for inflammation, itch, stomach ache, and recovery after childbirth. The plant is also grown as an ornamental shrub.
Why is Dillenia suffruticosa important in Brunei?
It is the national flower of Brunei and is found throughout the country. It represents Brunei in cultural symbols and was featured in Meghan Markle's wedding veil.
Is Dillenia suffruticosa invasive anywhere?
Yes, in Sri Lanka it is considered a highly invasive weed, spreading rapidly in suitable habitats.
Good reading and sources
- USDA Plants DatabaseUS Department of Agriculture, Article
- Plants of the World OnlineRoyal Botanic Gardens, Kew, Plant database
- Where it has been recordedGBIF, Plant database
- Sightings and photos by naturalistsiNaturalist, Plant database
- Dillenia suffruticosa on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Dillenia suffruticosa", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). Phool rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes. It is not medical or foraging advice: many flowers are poisonous, and traditional uses are reported, not recommended. If something is wrong, tell us. Last refreshed 2026-10-03.