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Bakau
Bruguiera sp.
Family Rhizophoraceae
updated
Jan 2013
Where seen? While Bakau putih
(Bruguiera cylindrica) is one of the most commonly seen trees
in our mangroves, others are less common, and some are quite rare.
Features: A tree generally with
knee roots, sometimes without. Leaves eye-shaped, shiny green and
stiff, lacking the tiny black spots on the underside that is typical
of Rhizophora. Flowers
small, usually with cup-shaped calyx. Petals thin and fringed with
hairs. The stamens are enclosed in pairs in a 'pouched petal'. When
triggered, the pouch explodes, dousing the pollinator with pollen.
Propagule develops on the parent plant and may be long and thin or
thick and short depending on the species.
Human
uses: The timber and other parts of these trees have many
traditional applications. See the fact sheets for the individual species
for more details.
Status and threats: Lenggadai
(Bruguiera parviflora) is listed as 'Endangered' and Bakau
mata buaya (Bruguiera hainesii) and Tumu
berau (Bruguiera sexangula) are both listed as 'Critically
Endangered' in the Red List of threatened plants of Singapore. |
Tumu with buttress and knee roots
St. John's Island, Aug 09
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Typical pouched petals of Bruguiera.
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Open and closed pouched petals.
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Fallen petals.
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Small flowers
several on one stalk.
Calyx usually pale.
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Tassels on petal tips.
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Sepals on propagules
bend towards stalk.
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Medim-sized flowers,
each on one stalk.
Calyx usually pinkish or yellowish.
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Tassels on petal tips.
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Sepals held away from the propagule.
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Large flowers,
each on one stalk.
Calyx usually red, sometimes pale.
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Tassels on petal tips.
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Sepals bend towards the propagule.
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Large
flowers, each on one stalk.
Calyx usually yellow.
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No tassels on petal tips.
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Sepals extend away
from the propagule.
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Long narrow flowers,
several on one stalk.
Calyx very long and narrow, pale.
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Tassels on petal tips.
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Sepals clasp the propagule.
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Links
References
- Chiou-Rong
Sheue, Jean W. H. Yong and Yuen- Po Yang. 2005. The
Bruguiera (Rhizophoraceae) Species in the Mangroves of Singapore,
Especially on the New Record and the Rediscovery. Taiwania,
50(4): 251-260, 2005 (pdf on the Raffles Museum of Biodiversity
Research website).
- Hsuan Keng,
S.C. Chin and H. T. W. Tan. 1990, The
Concise Flora of Singapore: Gymnosperms and Dicotyledons.
Singapore University Press. 222 pp.
- 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.
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