Biology:Quercus langbianensis
| 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 Hickel & A.Camus 1921
| |
| Synonyms[2] | |
|
Cyclobalanopsis camusiae (Trel. ex Hickel & A.Camus) Y.C.Hsu & H.Wei Jen | |
Quercus langbianensis is an uncommon oak tree species in the family Fagaceae.[3] It is placed in subgenus Cerris, section Cyclobalanopsis, the ring-cupped oaks.[4] 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 Cambodia, China (mostly Yunnan)[5] and Vietnam.
Description
Quercus langbianensis is an evergreen tree that reaches a height of up to 15 m. The bark is rough, with spots. The branches are brown and tomentose when young, less hairy with age.[5]
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
- ↑ 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. https://www.iucnredlist.org/species/78967883/173041636. Retrieved 13 November 2022.
- ↑ The Plant List: Quercus langbianensis Hickel & A.Camus (accessed 10/7/2017)
- ↑ "Quercus langbianensis". Tropicos.org. Missouri Botanical Garden. http://www.tropicos.org/Name/50279104.
- ↑ 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). https://figshare.com/articles/dataset/Appendix_2_1_________An_updated_infrageneric_classification_of_the_oaks/5547622/1.
- ↑ 5.0 5.1 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
Wikidata ☰ Q15338425 entry
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