coastal plants
Putat laut or Sea poison
Barringtonia asiatica

Family
Lecythidaceae
updated Jan 2013
Where seen? This tree with large waxy leaves, stunning pinkish pom-pom flowers and square fruits is now widely planted in our coastal parks. It is sometimes seen growing wild in our back mangroves. Elsewhere, it grows in a wide range of coastal habitats from coastal forest, shores, sandy to rocky coasts and occasionally in mangroves.

Features: A small to medium sized tree (7-30m tall). Bark pinkish grey, smooth becoming rough and thick in older trees. It may have buttressed roots.

Leaves oval (20-30cm long), waxy glossy somewhat fleshy, edge smooth (not toothed). Young leaves may be pinkish olive with pink veins. Older leaves wither yellow or pale orange.

Flowers very showy with four white petals and lots of fine, pink-tipped stamens forming a pom-pom shape (10-15cm). According to Corners "the buds beging to swell at noon, but the petals and stamens do not unfold until nearly sunset when the heavy perfume becomes noticeable". By sunrise the next day, the entire circle of stamens and petals fall off the tree. Corners says, "The ring of stamens floating downstream and the stale perfume of the night used to be a morning feature of Malayan rivers".

According to Tomlinson, the night-blooming flowers are pollinated by night-flying animals. According to Hugh Tan, they are pollinated by bats. According to Corners, the flowers are "evidently pollinated by moths, attracted by the scent and hovering in front of the flowers and probing into them with long tongues, they dust the pollen on their bodies".

Fruit large (8-10cm) squarish, fibrous and contains 1-2 seeds oblong (4-5cm long). The fruit floats and the softer outer layers rot in the water, so the fruit is stranded on a faraway shore as a fibrous basket surrounding the seed.

It is the food plant for moth larvae of Dasychira spp. and Thyas honesta.

Human uses: The tree contains a toxin called saponin, concentrated mainly in the seeds but also found in other parts. According to Burkill, the fruits are used as a fish poison. They are pulped and thrown into the river to stun fish. According to Wee, the heated leaves are used in the Philippines to treat stomache and rheumatism and the seeds used to get rid of tapeworms. According to Giesen, juice from the seeds are used to seal paper umbrellas and to kill lice and other external parasites.

Status and threats: This tree is listed as 'Critically Endangered' in the Red List of threatened plants of Singapore.


Heritage Tree: There is one Putat laut with Heritage Tree status. It is at the Singapore Botanic Gardens, Healing Garden and has a girth of 3m and is 10m tall.

Sungei Buloh Wetland Reserve, Jan 02


Young leaves pinkish.
Chek Jawa, Aug 07

Changi, Apr 09

Changi, Apr 09

Showy pom-pom shaped flower.
Sungei Buloh Wetland Reserve, Sep 03

Putat laut on Singapore shores

Photos of Putat laut for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Links

  • Barringtonia asiatica on the NParks Flora and Fauna website: photos and fact sheet.
  • Giesen, Wim and Stephan Wulffraat, Max Zieren and Liesbeth Scholten. 2006. Mangrove Guidebook for Southeast Asia (PDF online downloadable). RAP publication 2006/07 Food and Agriculture Organization of the United Nations Regional Office for Asia and the Pacific Bangkok.

References

  • Hsuan Keng, S.C. Chin and H. T. W. Tan. 1990, The Concise Flora of Singapore: Gymnosperms and Dicotyledons. Singapore University Press. 222 pp.
  • Tan, Hugh T.W. and T. Morgany. 2001. Growing the Native Plants of Singapore. BP Science Centre Guidebook. 168pp.
  • Corners, E. J. H., 1997. Wayside Trees of Malaya: in two volumes. Fourth edition, Malayan Nature Society, Kuala Lumpur. Volume 1: 1-476 pp, plates 1-38; volume 2: 477-861 pp., plates 139-236.
  • Tomlinson, P. B., 1986. The Botany of Mangroves Cambridge University Press. USA. 419 pp.
  • Davison, G.W. H. and P. K. L. Ng and Ho Hua Chew, 2008. The Singapore Red Data Book: Threatened plants and animals of Singapore. Nature Society (Singapore). 285 pp.
  • Wee Yeow Chin. 1992. A Guide to Medicinal Plants. The Singapore Science Centre. 160pp
  • Burkill, I. H., 1993. A Dictionary of the Economic Products of the Malay Peninsula. 3rd printing. Publication Unit, Ministry of Agriculture, Malaysia, Kuala Lumpur. Volume 1: 1-1240; volume 2: 1241-2444.
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