Quercus langbianensis

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Quercus langbianensis
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Fagaceae
Genus: Quercus
Subgenus: Quercus subg. Cerris
Section: Quercus sect. Cyclobalanopsis
Species:
Q. langbianensis
Binomial name
Quercus langbianensis
Hickel & A.Camus 1921

Quercus langbianensis is an uncommon oak tree species in the family Fagaceae. [2] It is placed in subgenus Cerris, section Cyclobalanopsis, the ring-cupped oaks. [3] These differ from other Quercus groups in that they have acorns with distinctive cups: usually with substantial rings, made-up of scales that have grown together. This species can be found in sub-tropical and tropical seasonal forests of Vietnam.

Synonymy

A number of species names, previously considered synonyms, [4] are now considered to be valid. [5] These very similar species are considered by some authors to be a species complex [6] and include: Quercus camusiae Trel. ex Hickel & A.Camus which is found in Vietnam and China (mostly Yunnan). [7]

Other species names listed were:

Description

Quercus langbianensis is an evergreen tree that reaches a height of up to 15 m. The leaves measure 70-140 (up to 170) x 25–40 mm, elliptical-lanceolate to oblanceolate, leathery and glabrous on both sides, with margins having numerous small teeth that are obtuse, wavy near the apex: which is acuminate to slightly caudate; petioles are 15–20 mm and hairless.

The acorns are sub-globose approximately 17–20 mm, covered with fine silky hair (sericeous), pale brown and ripening by September; scars are approximately 10 mm in diameter and convex. Their styles are persistent about 2 mm in diameter. Superficially, the cups are bowl-shaped, 8 x 20–25 mm approximately, enclosing 1/2 or 2/3 of the acorn. Outside and inside the reddish, tomentose acorn has a wall about 3 mm thick. The bracts are formed by 5 to 7 rings, with whole margins.

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Quercus blaoensis is the accepted name of a critically endangered oak tree species. It is estimated that there are fewer than 50 mature individuals. This species belongs the Asian sub-genus of Quercus within the family Fagaceae. It differs from other Quercus subgenera in that they have acorns with distinctive cups, characterised by growing rings of scaly protrusions and densely grouped acorns. This species is endemic to southeastern Vietnam where it inhabits evergreen seasonal tropical forests at altitudes of 200–1100 metres. It is named after 'Blao', the name used by the Chau Ma minority people for Bảo Lộc.

References

  1. ↑ Carrero, C.; Strijk, J.S. (2020). "Quercus langbianensis". IUCN Red List of Threatened Species . 2020: e.T78967883A173041636. doi: 10.2305/IUCN.UK.2020-3.RLTS.T78967883A173041636.en . Retrieved 13 November 2022.
  2. ↑ "Quercus langbianensis". Tropicos.org. Missouri Botanical Garden . Retrieved 18 July 2014.
  3. ↑ Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "Appendix 2.1: An updated infrageneric classification of the oaks" (xls). figshare. Retrieved 2023-02-24.
  4. ↑ The Plant List: Quercus langbianensis Hickel & A.Camus (accessed 10/7/2017)
  5. ↑ POWO: Quercus L. - 469 accepted species as of 18 April 2024
  6. ↑ Binh & Ngoc (2018) in Oaks of the World archived
  7. ↑ Flora of China, Cyclobalanopsis camusiae (Trelease ex Hickel & A. Camus) Y. C. Hsu & H. W. Jen, 1993. 法斗青冈 fa dou qing gang
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