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.
| Quercus langbianensis | |
|---|---|
Scientific classification 
| |
| 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 | |
A number of species names, previously considered synonyms,[4] are now considered to be valid.[5] These very similar species are considered by Binh, Ngoc et al. (2018)[6] to be a species complex; more information is available in Oaks of the World.[7]
Other species names previously listed here were:
- Quercus baniensis A.Camus - Vietnam
- Quercus blaoensis A.Camus - Vietnam
- Quercus cambodiensis Hickel & A.Camus [synonyms Q. langbianensis subsp. Cambodiensis (Hickel & A.Camus) Menitsky, Q. auricoma A.Camus] - Cambodia
- Quercus camusiae Trel. ex Hickel & A.Camus - Vietnam and China (mostly Yunnan).[8]
- Quercus dilacerata Hickel & A.Camus - Vietnam
- Quercus donnaiensis A.Camus - Vietnam
- Quercus pachyloma Seemen [synonym Cyclobalanopsis pachyloma var. mubianensis (Y.C.Hsu & H.Wei Jen) C.C.Huang] - native to S. China and Taiwan.
Description
editQuercus 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.
References
edit- ^ 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.
- ^ "Quercus langbianensis". Tropicos.org. Missouri Botanical Garden. Retrieved 18 July 2014.
- ^ 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.
- ^ The Plant List: Quercus langbianensis Hickel & A.Camus (accessed 10/7/2017)
- ^ POWO: Quercus L. - 469 accepted species as of 18 April 2024
- ^ Binh HT, Ngoc NV, Tagane S, Toyama H, Mase K, Mitsuyuki C, Strijk JS, Suyama Y, Yahara T (2018). A taxonomic study of Quercus langbianensis complex based on morphology and DNA barcodes of classic and next generation sequences. PhytoKeys 95: 37-70.
- ^ Oaks of the World archive retrieved 16 April 2024
- ^ 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
External links
edit
Data related to Quercus langbianensis at Wikispecies- Line drawings, Flora of China Illustrations vol. 4, fig. 378, drawing 5-11 at lower left
Media related to Quercus at Wikimedia Commons
