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Rhizophora apiculata Blume

Rhizophora apiculata Blume

Family

Rhizophoraceae

Synonyms

Rhizophora candelaria DC., Rhizophora conjugata Arnott, non L.

Vernacular Names

Malaysia

Bakau minyak, bakau tandok, bakau akik.

Brunei           

Bakau minyak, bakau.

Indonesia

Bakau minyak (general), bako (Javanese), babakoan laut (Sundanese).

Papua New Guinea

Abia (Gulf Province), bahkweh (Northern Province), pan a (Central Province).

Philippines

Bakauan (lalaki), uakatan (Tagalog), bakhau (Samar).

Singapore

Bakau minyak, red­tree.

Myanmar

Pyoo.

Cambodia

Kaông ka:ng nhi:.

Thailand

Kongkang-bailek, kongkang.

Vietnam

C[aa]y d[uw][ows]c.

Geographical Distributions

Rhizophora api­culata is commonly found in most mangrove swamps in tropical Asia, from the delta of the In­dus in Pakistan to Vietnam and Hainan. It occurs throughout the Malesian region and southwards to the Tropic of Capricorn in Queens­land, and eastwards as far as New Caledonia and Ponape (Micronesia).

Description

Rhizophora api­culata is an evergreen tree, that can grow up to over 30 m tall and with trunk up to 50 cm in diameter. It is gen­erally much smaller in exploited forests. Its bole is 10-12 m. The stem is supported by numerous, lateral, much branched stilt roots. The aerial roots sometimes develop from the lower branches. The taproot is usually abortive. Its branching primarily is sympodial. The bark is grey, almost smooth or with vertical fissures. The branchlets are swollen at the nodes. They are solid and pithy.

The leaves are arranged decussate and rosette-like at the end of twigs. The stipules are 4-8 cm long, lance-shaped , conspicuous and ca­ducous. The reddish petiole is 1.5-3 cm long. The blade is en­tire, elliptical-oblong to sublanceolate, measuring 7-18 cm x 3-8 cm, leathery, green and shiny. The apex is acute to apiculate, with wedge-shaped base, distinct above veins, ob­scure beneath, hairless with minute and scattered black corky warts on the lower surface. It is visible on the older or dried leaves.

The inflorescence is axillary (leaf scar below the leaf rosette) and 2-flowered. The peduncle is  0.5-1.5 cm long and thick. The bracteoles at the base of flower are cup-shaped. They are fleshy and slightly crenate. The yellow flowers are bi­sexual and sessile. The sepal is deeply 4-lobed, coria­ceous, accrescent and reflexed in fruit. The lobes are ovate, measuring 10-14 mm x 6-8 mm, concave, acute, brown-yel­low to reddish and persistent. The receptacle is with a disk. There are 4 free petals which are lance-shaped, measuring 8-11 mm x 1.5-2 mm, membranous, hairless and early caducous. There are at most 12 stamens which are sessile, with anthers 6-7.5 mm long, acute, multi-loculate and open with a large ventral valve. The ovary is 1.5-3.5 mm long, semi-inferior, and 2-celled where the superior part is en­closed by the disk and bluntly conical. The style is 0.5-1 mm long and 2-lobed.

The brown fruit is an ovoid or inversely pear-shaped berry, measures 2-3.5 cm long and rather rough. The hypocotyl is cylindrical to club-shaped, measures up to 40 cm x 1.2 cm, often slightly curved, more or less blunt, smooth and shining. It is green tinged with red.

Ecology / Cultivation

Rhizophora apiculata is the most common man­grove species. It grows gregariously in swamps flooded by normal high tide, on deep soft mud of estuaries, often consolidated and sheltered from surf and currents by pioneer species of Avicennia L. and Sonneratia L.f. R. apiculata avoids hard soils and develops well in perhumid regions where it can form almost pure stands, sometimes in association with Bruguiera spp. or R. mucrona­ta. It does not occur in fresh water swamps. It is killed by frost and by extended periods of near-freezing temperatures.

Line Drawing / Photograph

Rhizophora_apiculata

References

  1. Plant Resources of South-East Asia No.11: Auxiliary plants.

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