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Research Article
Vatica najibiana (Dipterocarpaceae), a new species from limestone in Peninsular Malaysia
expand article infoAbdul Rahman Ummul-Nazrah, Mohd Amin Mohd Hairul, Imin Kamin, Ruth Kiew, Poh Teck Ong
‡ Forest Research Institute Malaysia, Kepong, Malaysia
Open Access

Abstract

Vatica najibiana Ummul-Nazrah (Dipterocarpaceae), from the Relai Forest Reserve, Gua Musang, Kelantan and Gua Tanggang, Merapoh, Pahang, is described and illustrated. This species is Endangered and known from small populations restricted to two isolated karst limestone hills. The type locality, Relai Forest Reserve limestone, is currently under threat from encroaching oil palm plantations and ongoing logging, which, if it continues, will threaten the Kelantan population with extinction. The morphology of V. najibiana and the similar V. odorata subsp. odorata and V. harmandiana is compared.

Keywords

Dipterocarpaceae, Vatica, Kelantan, Pahang, limestone hills, oil palm, logging

Introduction

In Peninsular Malaysia, Vatica L., known in Malay as resak, includes 32 species (Saw 2002; Ashton and Appanah 2004; El-Taguri and Latiff 2010, 2012; Tan et al. 2014; Chua et al. 2015). It is a genus of understorey and main canopy trees from lowland forest to hill dipterocarp forest but it also occurs in coastal peat swamp and other swampy areas with only V. harmandiana Pierre and V. kanthanensis Saw restricted to limestone habitats. In Ashton and Appanah (2004) and Chua et al. (2015), V. harmandiana was called V. cinerea King that Pooma et al. (2017, p. 670) argued was a synonym of V. harmandiana. The genus Vatica is distinctly different from other Malayan genera of Dipterocarpaceae. Most Vatica species are small or medium-sized trees, unbuttressed with smooth bark and leaves with reticulate tertiary venation. There are two sections in Vatica: sect. Vatica with equal fruit calyx lobes and sect. Sunaptea with unequal fruit calyx lobes. This new Vatica species belongs to sect. Sunaptea, which now includes ten species.

This new Vatica species was discovered on the summit of a karst limestone hill within the Relai Forest Reserve, Gua Musang District, Kelantan, during the biodiversity survey of the flora of five sizeable limestone hills scattered within the FELDA Chiku oil palm plantation (Kiew et al. in prep.). The impetus for the survey was the issuing of a licence to quarry the largest hills named FELDA Chiku 7 and FELDA Chiku 8 to supply limestone to a new cement factory reputed to be the largest in SE Asia (Utusan Online 2015). The aim of the survey was to document the flora of the two hills scheduled for quarrying, which were previously hardly known botanically and to test the assertion by the cement company that protecting another nearby hill, FELDA Chiku 4, would compensate for biodiversity lost from the two larger hills. None of the limestone hills within the FELDA Chiku plantation is legally protected and all are currently under threat from disturbance associated with the oil palm plantation (clearing and burning the limestone forest around the base of the hills, grazing by free ranging cattle, hunting of the protected serow, Capricornis sumatraensis, collecting orchids etc.). Due to these threats, one species, Impatiens chikuensis, that is a strict endemic known only from FELDA Chiku 5 and 8, faces extinction (Kiew 2016).

The limestone hill flora in Peninsular Malaysia is being exploited and disturbed by quarrying, clearing the surrounding forest for agricultural plantations or burning limestone vegetation during land clearing, disturbance associated with caves, the establishment of temples and resorts, as well as from recreational and tourism activities (Kiew 1997). Kiew et al. 2017 demonstrated that no single hill has more than a fraction of limestone flora and that 192 species are endangered being known from less than five localities limestone hills, for example Monophyllaea musangensis A. Weber (Weber 1998), Gymnostachyum kanthanense Kiew, Meiogyne kanthanensis Ummul-Nazrah & J.P.C.Tan and Vatica kanthanensis Saw (Tan et al. 2014), Impatiens glaricola Kiew and Impatiens vinosa Kiew (Kiew 2016). Therefore, limestone hills are one of the most threatened vegetation types in Peninsular Malaysia and are recognised nationally as Environmentally Sensitive Areas because of their high biodiversity and vulnerability (73 of the 445 hills are the sites of active or former quarries, Liew et al. 2016). In addition, many karsts are still incompletely known botanically meaning that new species await discovery. For example, during the botanical survey of the Chiku limestone (Kiew et al. in prep.), several rare and endangered species were discovered, including this new species.

In determining the identity of the specimens, we discovered that the species had in fact already been collected from Gua Tanggang (a.k.a. Tagang) in Merapoh, Pahang, a limestone hill about 40 km south of the Relai Forest Reserve limestone but that it had been incorrectly identified as Vatica cinerea King (now V. harmandiana), a species restricted to NW Malaysia (Chua et al. 2010).

Materials and methods

The new Vatica species was discovered on a limestone hill (5.024478 N, 102.114360 E, Ktn 50, numbering follows Price 2014) in the Relai Forest Reserve (Ktn 50), Gua Musang District, Kelantan. Herbarium specimens were collected and a photographic record was made. The population was in mature fruit but a few old dried flowers were obtained. The extensive collection of Dipterocarpaceae in the Kepong Herbarium (KEP) was used for comparison and for measurements of similar species and the other specimen of this new taxon (FRI 44774), previously collected from Gua Tanggang (a.k.a. Tagang), Merapoh, Pahang was examined in detail. The description of the new species was compared with similar species in standard texts (Saw 2002; Ashton and Appanah 2004; El-Taguri and Latiff 2010, 2012; Tan et al. 2014; Chua et al. 2015). The description is based on field observations and comparison by using KEP herbarium specimens. The provisional conservation assessment is based on the IUCN Red List Categories and Criteria Version 3.1 (IUCN 2012).

Taxonomy

Vatica najibiana Ummul-Nazrah, sp. nov.

Figures 1, 2

Diagnosis

Amongst the Vaticas with a half inferior ovary, it groups with Vatica harmandiana and V. odorata (Griff.) Symington subsp. odorata. Vatica harmandiana occurs on limestone hills and rocks but is different in having leaves that are elliptic-lanceolate, leaf base cuneate and nut diameter 7–10 mm as oppose to the obovate-elliptic leaf, leaf base cordate-subcordate and nut diameter of 5–6 mm in V. najibiana. Vatica odorata subsp. odorata is closely similar to the new species but can be separated by its elliptic-oblong leaf, leaf base obtuse, leaf apex acuminate, nut diameter 8–9 mm and occurrence in lowland and hill forest (Table 1).

Differences between Vatica najibiana, V. odorata subsp. odorata and V. harmandiana.

Character V. najibiana V. odorata subsp. odorata V. harmandiana
Habit Small tree to 5–7 m Tall tree to 24 m Tree, 15–24 m
Leaves
Petiole indumentum Dark brown Mid brown (reddish-brown) Pale brown
Lamina shape Obovate to elliptic Elliptic to oblong Elliptic to lanceolate
Lamina size (cm) (3–)5–10.2 × 1.5–5 8–16 × 2.7–6 5.2–12 × (1.8–)2–5
Lamina base Cordate to subcordate Obtuse Cuneate
Lamina margin Recurved Not recurved Not recurved
Lamina apex Acute Acuminate Blunt to acute
No. of lateral veins (pairs) (6–)7–10 9–15 7–8
Fruits
Calyx lobes length (cm) 2.3–3.3 × 0.5–0.8 4–5.5 × 1–1.5 2.6–7 × 1–1.8
Nut Diameter (mm) 5–6 8–9 7–10
Habitat Limestone only Lowland and hill forest Limestone only

Type

Peninsular Malaysia. Kelantan, Gua Musang District, Relai Forest Reserve (Ktn 50), 05°02'47.8"N, 102°11'43.6"E, 19 October 2016, Ummul-Nazrah et al. FRI 86369 (holotype KEP!; isotypes K!, SAN!, SING!).

Figure 1. 

Vatica najibiana. A Plant in its natural habitat B Bole C Inner bark D–E Leafy shoots with infructescences F Fruit. (Photographs by K. Imin & A.R. Ummul-Nazrah).

Figure 2. 

Vatica najibiana. A Leafy shoot with fruits B Calyx C Petal D–E Fruit F Long & short calyx lobes of fruit G Stellate hair H Fruit nut. (Drawn by N. Mohamad-Aidil from Ummul-Nazrah et al. FRI 86369).

Description

Small tree, 5–7 m tall; bole to 15–17 cm diameter, without buttresses. Bark smooth with faint horizontal rings, dark brown with white lichen patches; inner bark pale yellow, exuding clear sap when cut. Twigs robust, 3–5 mm diameter, covered with 6–15-armed stellate hairs, 94–169 µm diameter, glabrous when mature, older twigs terete. Leaves when young brown rusty beneath, glabrous when mature; petioles 0.8–1.5 cm long, 0.1–0.2 cm wide, densely covered with stellate hairs, caducous when mature, drying dark brown; lamina obovate to elliptic, (3–)5–10.2 × 1.5–5 cm, thickly chartaceous, bullate, green on both surfaces when fresh, base cordate to subcordate, margin entire and recurved, apex acute; midrib prominent on both surfaces; lateral veins (6–)7–10 pairs, prominent below, slightly raised and visible above, ascending to margin; intercostal veins reticulate-scalariform and slightly conspicuous on both surfaces. Flowers: (dry) pedicels with velvety brown stellate hairs; calyx 5-lobed, elliptic, 4–7 × ca. 1 mm, densely covered with stellate hairs on both surfaces, apex acute; petals narrowly elliptic, ca. 6 × 2 mm, glabrous outside, inside from base to tip completely covered with 6–10-armed stellate hairs, 77–120 µm diameter. Infructescence axillary, near apex of leafy shoot, ca. 4 cm long, densely covered with rusty stellate hairs, branching once or twice, densely covered with stellate hairs; first branches with 1–7 fruits along axis, nodes 4–5 mm apart. Fruits: stalks 1–2 mm long, ca. 1 mm thick at base, covered with caducous stellate hairs; in life mature calyx red-brown, chartaceous, lobes 5, 2–3 larger than rest, attached to half inferior ovary, above forming a cup, glabrous outside, inner part at base completely covered with stellate hairs, lobes elliptic, apex rounded with 5 longitudinal prominent veins on the adaxial surface, 2.3–3.3 × 0.5–0.8 cm; shorter lobes 0.8–1 × ca. 0.2 cm; nut ovoid, 5–6 mm diameter, with persistent stigma, densely covered with stellate hairs, half hidden within calyx.

Distribution

Endemic in Peninsular Malaysia, known only from Kelantan (Relai Forest Reserve, Gua Musang) and Pahang (Gua Tanggang, Merapoh).

Etymology

This species is named in honour of the Prime Minister of Malaysia, Dato’ Sri Mohd Najib bin Tun Abdul Razak, for his strong interest in nature conservation and protection of the environment.

Provisional conservation status

Endangered B2ab(iii). This species is known from the summit of two isolated karst limestone hills in Relai Forest Reserve, Gua Musang District, Kelantan and Gua Tanggang, Merapoh, Pahang, about 40 km apart (Liew et al. 2016). Together they have an area of occupancy of less than 10 km2 (Figure 3). The Relai Forest Reserve is classified as a permanent forest reserve but is currently threatened by encroachment by oil palm plantations that pose a high risk of burning to the limestone vegetation, as well as disturbance from ongoing logging in the Sungai Relai Forest Reserve. Gua Tanggang in Merapoh, on the other hand, is situated outside of Taman Negara which means that it is not in a protected area.

Habitat

It is an emergent tree on the rugged summit of karst limestone at 178–520 m altitude growing in rock fissures with a thick layer of leaf litter.

Phenology

Fruiting specimens were collected in Relai Forest Reserve in October and Gua Tanggang in early August; complete flowers not seen but in October, many calyces and a few petals were collected.

Additional specimen examined

Peninsular Malaysia. Pahang, Lipis District, Merapoh, Gua Tanggang, 4.410000N, 102.055000E, 520 m alt., 6 August 1996, Saw et al. FRI 44774 (KEP!)

Figure 3. 

Distribution of Vatica najibiana in Peninsular Malaysia.

Acknowledgements

We wish to express our gratitude for the support and encouragement given by the Director-General of Forest Research Institute Malaysia (FRIM). The research was carried out as part of the Flora of Peninsular Malaysia Project at the Forest Research Institute Malaysia, funded by the Ministry of Natural Resources and Environment (NRE) of Malaysia under the 11th Malaysian Plan (SPPII No. P23085100018003); and “Towards conservation strategy/policy for limestone hills in Peninsular Malaysia: Understanding and documenting plant biodiversity focus on Kelantan and Perlis limestone hill (Phase 1)” under National Conservation Trust Fund for Natural Resources (NCTF). The authors thank Dr L.G. Saw and Dr R.C.K. Chung for their support and comments on the manuscript; the KEP field and herbarium team for their invaluable support, the local resident guide in FELDA and to N. Mohamad-Aidil for the botanical illustration. We would also like to thank the editor and two reviewers, Dr P.S. Ashton and Dr M.R. Cheek for their useful comments on the paper.

References

  • Ashton PS, Appanah S (2004) Foresters’ Manual of Dipterocarps. Malayan Forest Records No. 16 (2nd edn). Forest Research Institute Malaysia, Kepong, 519 pp.
  • Chua LSL, Suhaida M, Hamidah M, Saw LG (2010) Malaysia Plant Red List Peninsular Malaysian Dipterocarpaceae. Research Pamphlet No. 129. Forest Research Institute Malaysia, Kepong, 210 pp.
  • El-Taguri HMA, Latiff A (2010) Two new records of Vatica L. (Dipterocarpaceae) in Peninsular Malaysia and its taxonomic significance. Malaysian Forester 74(1): 111–122.
  • El-Taguri HMA, Latiff A (2012) Two new species and two new records of Vatica L. (Dipterocarpaceae) for Peninsular Malaysia. Malaysian Forester 75(2): 127–134.
  • IUCN (2012) IUCN Red List Categories and Criteria Version 3.1. Second edition. IUCN Species Survival Commission, IUCN, Gland, Switzerland and Cambridge, UK.
  • Kiew R (1997) The Malaysian highlands and limestone hills: threatened ecosystems. In: State of the Environment in Malaysia. Consumers Association of Penang, 66−73.
  • Kiew R (2016) Impatiens (Balsaminaceae) species from karst limestone in Kelantan, Malaysia, including three new species. Gardens’ Bulletin Singapore 68(02): 225–238. https://doi.org/10.3850/S2382581216000181
  • Kiew R, Rafidah AR, Ong PT, Ummul-Nazrah AR (2017) Limestone treasures, rare plants in Peninsular Malaysia-what they are, where they grow and how to conserve them. Malaysian Naturalist 71(1): 32–41.
  • Kiew R, Ummul-Nazrah AR, Ong PT, Imin K, Aliaa-Athirah AM, Rafidah AR (in prep.) Understanding the distribution of limestone plant species and its implications for conservation – lessons from the FELDA Chiku limestone flora, Kelantan, Malaysia.
  • Pooma R, Poopath M, Newman ME (2017) Dipterocarpaceae. Flora of Thailand 13(4): 557–685.
  • Price L (2014) Cave and karst of Peninsular Malaysia. A Register (2nd edn). Berliner Höhlenkundliche Berichte Volume 54, Berlin.
  • Saw LG (2002) A New Species of Vatica (Dipterocarpaceae) from Peninsular Malaysia. Gardens' Bulletin Singapore 54: 247–251.
  • Weber A (1998) New taxa of Monophyllaea (Gesneriaceae) from Peninsular Malaysia. Beiträge zur Biologie der Pflanzen 70 [1997]: 405–406.