Pittosporum peridoticola (Pittosporaceae), a new ultramafic obligate species restricted to Kinabalu Park (Sabah, Malaysia)

Sugau, John and van der Ent, Antony (2016) Pittosporum peridoticola (Pittosporaceae), a new ultramafic obligate species restricted to Kinabalu Park (Sabah, Malaysia). Botanical Studies, 57 4.1-4.7. doi:10.1186/s40529-016-0119-9


Author Sugau, John
van der Ent, Antony
Title Pittosporum peridoticola (Pittosporaceae), a new ultramafic obligate species restricted to Kinabalu Park (Sabah, Malaysia)
Formatted title
Pittosporum peridoticola (Pittosporaceae), a new ultramafic obligate species restricted to Kinabalu Park (Sabah, Malaysia)
Journal name Botanical Studies   Check publisher's open access policy
ISSN 1999-3110
Publication date 2016-02-01
Sub-type Article (original research)
DOI 10.1186/s40529-016-0119-9
Open Access Status DOI
Volume 57
Start page 4.1
End page 4.7
Total pages 7
Place of publication Heidelberg, Germany
Publisher SpringerOpen
Collection year 2017
Language eng
Formatted abstract
Background: Kinabalu Park, in Sabah (Malaysia) on Borneo Island, is renowned for the exceptionally high plant diversity it protects, with at least 5000 plant species enumerated to date. Discoveries of plant novelties continue to be made in Sabah, especially on isolated ultramafic outcrops, including in the genus Pittosporum (Pittosporaceae) with P. linearifolium from Bukit Hampuan on the southern border of the Park, and P. silamense from Bukit Silam in Eastern Sabah, both narrow endemics restricted to ultramafic soils.

Results: A distinctive new species of Pittosporum (P. peridoticola J.B.Sugau and Ent, sp. nov.) was discovered on Mount Tambuyukon in the north of Kinabalu Park during ecological fieldwork. The diagnostic morphological characters of this taxon are discussed and information about the habitat in which it grows is provided. The soil chemistry in the rooting zone of P. peridoticola has high magnesium to calcium quotients, high extractable nickel and manganese concentrations, but low potassium and phosphorus concentrations, as is typical for ultramafic soils. Analysis of foliar samples of various Pittosporum-species originating from ultramafic and non-ultramafic soils showed a comparable foliar elemental stoichiometry that is suggestive of ‘Excluder-type’ ecophysiology.

Conclusion: Pittosporum peridoticola is an ultramafic obligate species restricted to Kinabalu Park with only two known populations within the boundaries of the protected area. It is vulnerable to any future stochastic landscape disturbance events, such as forest fires or severe droughts, and therefore its conservation status is ‘Near Threatened’.
Keyword Hyper-endemic
Mount Tambuyukon
Soil chemistry
Ultramafic obligate
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
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Created: Tue, 02 Feb 2016, 13:53:19 EST by Mr Antony Van Der Ent on behalf of Centre For Mined Land Rehabilitation