Quercus langbianensis

Quercus langbianensis is the accepted name of an uncommon oak tree species in the Asian sub-genus of Cyclobalanopsis in the family Fagaceae.[2] These differ from other Quercus subgenera 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)[3] and Vietnam.

Quercus langbianensis
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Fagaceae
Genus: Quercus
Subgenus: Quercus subg. Cyclobalanopsis
Species:
Q. langbianensis
Binomial name
Quercus langbianensis
Hickel & A.Camus 1921
Synonyms[1]

Cyclobalanopsis camusiae (Trel. ex Hickel & A.Camus) Y.C.Hsu & H.Wei Jen
Cyclobalanopsis faadoouensis Hu
Cyclobalanopsis pachyloma var. mubianensis Y.C.Hsu & H.Wei Jen
Quercus baniensis A.Camus
Quercus blaoensis A.Camus
Quercus cambodiensis Hickel & A.Camus
Quercus camusiae Trel. ex Hickel & A.Camus
Quercus dilacerata Hickel & A.Camus
Quercus donnaiensis A.Camus
Quercus geminata Hickel & A.Camus [Illegitimate]
Quercus langbianensis subsp. Cambodiensis (Hickel & A.Camus) Menitsky
Quercus pachyloma var. mubianensis (Y.C.Hsu & H.Wei Jen) C.C.Huang

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.[3]

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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References
  1. The Plant List: Quercus langbianensis Hickel & A.Camus (accessed 10/7/2017)
  2. "Quercus langbianensis". Tropicos.org. Missouri Botanical Garden. Retrieved 18 July 2014.
  3. 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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