Quercus helferiana

Quercus helferiana is a species of tree in the family Fagaceae and the "ring-cupped oak" sub-genus. It is native to Vietnam, Thailand, Laos, Myanmar, India (northeast), and southern China (Yunnan, Guangdong, Guangxi, Guizhou).[2]

Quercus helferiana
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Fagaceae
Genus: Quercus
Subgenus: Quercus subg. Cyclobalanopsis
Species:
Q. helferiana
Binomial name
Quercus helferiana
A.DC. 1864
Synonyms[1]
  • Cyclobalanopsis helferiana (A.DC.) Oerst.
  • Quercus ilex Lour.
  • Quercus prainiana H.Lév. 1913 not Trel. 1924

Description

Quercus helferiana is a tree up to 20 m. tall, with a trunk up to 0.3 m in diameter. Leaves oblong-elliptic, to elliptic-lanceolate, 120-150 (up to 220) × 40-80 (up to 95) mm, with wavy edges but no teeth or lobes.[2] The acorn is oblate, 10-16 × 15–22 mm, grey, with a depressed apex and often covered with shaggy hairs; the scar is 12–14 mm in diameter, flat to concave at maturity. Flowering is in March–April, acorns found from October–November.

References
  1. The Plant List, Quercus helferiana A.DC.
  2. Flora of China, Cyclobalanopsis helferiana (A. de Candolle) Oersted, 1867, 毛枝青冈 mao zhi qing gang


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