Xanthophyllum longum

{{Speciesbox

| image =

| image_caption =

| status = CR

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Tanggaraju, S. |author2=Hor, C.S. |author3=Sugau, J. |author4=Nilus, R. |author5=Maycock, C.R. |author6=Matusin, Dg Ku Rozianah, M. |author7=Khoo, E. |author8=Damit, A. |author9=Mohd Yusof, Nur Adillah, M.Y. |author10=Tsen, S. |author11=Pereira, J.T. |year=2021 |title=Xanthophyllum longum |volume=2021 |page=e.T162025212A162033764 |doi=10.2305/IUCN.UK.2021-1.RLTS.T162025212A162033764.en |access-date=5 April 2023}}

| genus = Xanthophyllum

| species = longum

| authority = W.J.de Wilde & Duyfjes

| synonyms =

}}

Xanthophyllum longum is a tree in the family Polygalaceae. The specific epithet {{lang|la|longum}} is from the Latin meaning 'long', referring to the petioles.

Description

Xanthophyllum longum grows up to {{convert|5|m|-1}} tall with a trunk diameter of up to {{convert|10|cm|0}}. The bark is pale greenish or blackish. The brownish fruits are round and measure up to {{convert|1.7|cm|in|0|abbr=on}} in diameter.

Range and habitat

Xanthophyllum longum is endemic to Borneo and known only from Sabah, where it is known only from Sg Pinangah Forest Reserve. The species' current estimated extent of occurrence (EOO) and area of occupancy (AOO) are 4 km². It grows in lowland rain forests along streams and on hillsides on undulating land between 350 and 500 metres elevation.

Conservation

Urbanization and habitat loss have reduced its area of occupancy by 67%, and its extent of occurrence (EOO) by over 90%. The species' remaining population is within a commercial forest reserve, which is open to logging. Its conservation status is assessed as critically endangered.

References

{{Reflist | refs =

{{Cite web | title = Xanthophyllum longum W.J.de Wilde & Duyfjes | url = http://www.theplantlist.org/tpl1.1/record/kew-2467490 | work = The Plant List | access-date = 25 March 2014}}

{{Cite book | last1 = De Wilde | first1 = W. J. J. O. | last2 = Duyfjes | first2 = Brigitta E. E. | date = March 2007 | contribution = Xanthophyllum longum W.J.de Wilde & Duyfjes | contribution-url= http://www.chm.frim.gov.my/backup/TFSS.vol4_5_6.pdf | editor1-last = Soepadmo | editor1-first = E. | editor2-last = Saw | editor2-first = L. G. | editor3-last = Chung | editor3-first = R. C. K. | editor4-last = Kiew | editor4-first = Ruth | title = Tree Flora of Sabah and Sarawak | volume = 6 | pages = 261 | publisher = Forest Research Institute Malaysia | isbn = 978-983-2181-89-7 | url = http://www.chm.frim.gov.my/Resources/Publications/Books/Floras/Tree-Flora-of-Sabah-and-Sarawak.aspx | version = (free online from the publisher, lesser resolution scan PDF versions) | access-date = 25 March 2014 }}

}}

longum

Category:Endemic flora of Borneo

Category:Trees of Borneo

Category:Flora of Sabah

Category:Flora of the Borneo lowland rain forests

Category:Plants described in 2005