Newsletter
Dipterocarpus costulatus Slooten
by Ms. Siti Fariezza Bt Khairi Thaw
Newsletter
Dipterocarpus costulatus Slooten
by Ms. Siti Fariezza Bt Khairi Thaw

Dipterocarpus costulatus is known by locals as keruing kipas. Keruing is the vernacular name for the genus Dipterocarpus while kipas is the Malay word for fan. The common name of this species is associated with its conspicuous ridged leaves which resemble the corrugated surface of a palm fan commonly used during grilling of satay or a traditional hand-held fan.

In Negeri Sembilan, D. costulatus is also known as keruing mara kluang and keruing pekat. However, both vernacular names are also shared by other Dipterocarpus species. For example, keruing mara keluang is also a vernacular name for D. costatus while keruing pekat also refers to D. grandiflorus, D. rigidus and D. verrucosus. The Malay word pekat means thick which refers to the viscosity or consistency of the oil produced from the wood of all of the above mentioned species (Symington et al., 2004). Thus, to avoid confusion keruing kipas has been chosen as the preferred vernacular name for D. costulatus.

This species is an emergent tree that can grow up to 1.2 m dbh and 50 m tall. It has a grey bole and patchily peeling bark that is covered with lenticels. The leaf is thick and has a leather-like texture. The leaf blade is broadly elliptic to ovate, measuring 12–20 X 7–14 cm. The stipules are greenish white and can measure up to 16 X 2 cm. The flowers are typical Dipterocarpus flowers, with 5 pinkish cream petals measuring about 3 X 5 cm. The fruits have 2 major calyx lobes of 20 X 4 cm and another 3 minor calyx lobes of 0.7 X 0.6 cm (Ashton et al., 2004).

Dipterocarpus costulatus is native to Sumatra, Peninsular Malaysia, Singapore, and Borneo. Ashton et al. (2004) stated that the species is common in the peninsula but infrequently found in Sabah while Julia et al. (2014) reported that this species is widely scattered throughout Sarawak’s southwest.

Its preferred habitat is lowland mixed dipterocarp forest that can sometimes be subjected to inundation. However, it can also be found on higher areas, as it has been recorded on a hill up to 600 m elevation in Bubu Forest Reserve in Perak (Symington et al., 2004).

Like other Dipterocarpus spp. such as D. crinitus and D. grandiflorus, the timber of D. costulatus locally known as keruing, is classified as medium hardwood, which has a high commercial value. The timber is used for heavy construction, boat building and flooring. In addition, after appropriate treatment, the timber can be used to build bridges, railway sleepers and power-line poles (Malaysian Timber Council, n.d.).

According to Symington (2004) the major threat for D. costulatus is forest conversion which can lead to habitat loss. In Malaysia, it is categorised as Near Threatened (NT); the populations are still well represented in Totally Protected Areas of Peninsular Malaysia and Sarawak (Chua et al., 2010; Julia et al., 2014). The global conservation status for this species is also Near Threatened (NT) as the areas where this species grows is considered as threatened habitats (Barstow, 2019).

A living collection of D. costulatus can be observed at the Dipterocarp Arboretum of the Forest Research Institute Malaysia at Kepong, Selangor.

References

  1. Ashton, P.S. (2004). Dipterocarpaceae. In Soepadmo, E., Saw, L.G. & Chung, R.C.K. (Eds.), Tree Flora of Sabah and Sarawak, volume 5. Sabah Forestry Department, Forest Research Institute Malaysia (FRIM), Sarawak Forestry Department. pp. 113-114.
  2. Barstow, M. (2019). Dipterocarpus costulatus. The IUCN Red List of Threatened Species 2019: e.T33073A68069977. https://dx.doi.org/10.2305/IUCN.UK.2019-2.RLTS.T33073A68069977.en. July 14, 2020, from
  3. Chua, L.S.L., Suhaida, M., Hamidah, M. & Saw, L.G. (2010). Malaysia Plant Red List: Peninsular Malaysian Dipterocarpaceae. Forest Research Institute Malaysia (FRIM) & Ministry of Natural Resources and Environment Malaysia, Malaysia. pp. 73, 146.
  4. Julia, S., Chong, L., Vilma, B., Esther, S. & Pearce, K.G. (2014). Sarawak Plant Red List Dipterocarpaceae: Series I: Dipterocarpus, Dryobalanops & Shorea. Sarawak Forestry Corporation Sdn. Bhd., Malaysia. pp. 193.
  5. Malaysian Timber Council (n.d). MTC Wood Wizard. Retrieved July 03, 2020, from http://mtc.com.my/wizards/mtc_tud/items/report(227).php
  6. Symington, C.F., Barlow, H.S., Ashton, P.S. & Appanah, S. (2004). Foresters' Manual of Dipterocarps. Forest Research Institute Malaysia (FRIM) and Malayan Nature Society, Malaysia. pp. 340, 373-374.
QR Code
Scan QR code for mobile experience

Other articles

Vatica odorata (Griff). Symington

Ms. Siti Fariezza Bt Khairi Thaw   •   20 Nov 2020   •   155 views

Dryobalanops aromatica C.F. Gaertn

Mrs. Syahida Emiza Suhaimi & Azrin Najua Md. Nor   •   10 Nov 2020   •   266 views

Shorea lamellata Foxw.

Mrs. Nur Hazwanie Binti Abd Halim   •   30 Oct 2020   •   88 views

Impatiens curtisii Hook. f. (Balsaminaceae)

Mrs. Sarah Nabila Binti Rosli   •   20 Oct 2020   •   291 views

Troides helena (Linnaeus, 1758)

Mrs. Aziemah Binti Kinan   •   10 Oct 2020   •   189 views
Today, there are less than 200 Malayan tigers left in our country.
#SaveOurMalayanTiger. Visit www.harimau.my
Malaysia Biodiversity Information System (MyBIS)
Copyright © 2020, Ministry of Energy and Natural Resources (KeTSA). All rights reserved. DISCLAIMER - The Malaysian Government, and Ministry of Energy and Natural Resources (KeTSA) shall not be liable for any loss or damage caused by the usage of any information obtained from this website. By entering this site, you acknowledge and agree that no portion of this site, including but not limited to names, logos, trademarks, patents, sound, graphics, charts, text, audio, video, information or images are either MyBIS property or the property permitted by third-party and shall not be used without prior written approval from the owner(s).
Best viewed using latest Mozila Firefox, Google Chrome and Internet Explorer 10 with Resolution 1024 x 768px or above. Version 2.0 / 2016