Quercus stenophylloides

Quercus stenophylloides, also called Arisan oak, is a species of evergreen, broad-leaf tree endemic to Taiwan.[2] It is placed in Quercus subgenus Cerris, section Cyclobalanopsis.[3]

Quercus stenophylloides
Acorns and leaves of Arisan oak from Taiwan
Scientific classification Edit this 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. stenophylloides
Binomial name
Quercus stenophylloides
Hayata
Synonyms
  • Cyclobalanopsis stenophylloides (Hayata) Kudô & Masam, 1930
  • Quercus salicina var. stenophylloides (Hayata) S.S. Ying, 1988
  • Quercus salicina var. asiatica C.F.Shen
  • Quercus salicina var. stenophylloides (Hayata) S.S.Ying

Description

Quercus stenophylloides can grow up to 15 m(49 ft) tall, with trunks up to 40 cm(16 in) wide. They have gray branchlets with lenticels.[4]

Leaf

Leaf shape can range from lanceolate to ovate-oblong, 6 - 14.5 cm(2.4 - 5.7 in) long, 1.2 - 4.2 cm(0.5 - 1.7 in) wide, acuminate at apex, and acute or obtuse at base.

They are green on the upside, grayish-white, glaucous or green and hairy beneath.

The texture is coriaceous. Echinate-serrate on the edge. Midribs are concave above, elevated beneath. Lateral veins 9 - 17 pairs. Petioles 1 - 2.3 cm(0.4 - 0.9 in) long.[4]

Flower

Blooming from May to June, the flowers are unisexual and are both small, hairy, growing on the same individual tree.

Both are arranged on a stem, only staminate flowers' are a lot longer. Also, staminate flowers are arranged spirally on a slim drooping stem — this is called catkins.

Staminate catkins are about 5 cm(2 in) long; Staminate flowers are about 3.5 mm(0.14 in) long; 4 - 6 perianths, lobed, hairy outside, glabrous inside; 4 - 9 stamens, filaments 2.5 mm(0.1 in) long, anthers 1 mm(0.04 in) long.

Pistillate flowers are 2 mm(0.08 in) long, and 3.5 mm(0.14 in) wide; 3 - 4 perianths, lobed, hairy, 3 - 4 styles, curved.[4]

Fruit

Fruits are maturing from October to November. They are first green, then brown and fall to the ground when mature. The cupules are 0.9 - 1.2 cm(0.4 - 0.5 in) long, 1.3 - 1.5 cm(0.5 - 0.6 in) across, scales in 8 - 9 concentric rings, tomentose, margins of rim dentate-serrate; nuts ellipsoid, 1.7 - 2.1 cm(0.7 - 0.8 in) long, 1.2–1.6 cm(0.5 - 0.6 in) across.[4]

Distribution

They are commonly seen in mountains at the altitude of 900 – 2600 m throughout the Taiwan island.[4]

References
  1. Carrero, C. 2020. Quercus stenophylloides. The IUCN Red List of Threatened Species 2020: e.T78976949A78976963. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T78976949A78976963.en. Accessed 4 March 2023.
  2. "Oldstyle id: 2ad67c76c29e4ee475d1070a9cad259b". Catalogue of Life. Species 2000: Leiden, the Netherlands.
  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. doi:10.6084/m9.figshare.5547622.v1. Retrieved 2023-02-24.
  4. "狹葉櫟 Cyclobalanopsis stenophylloides - Plants of TAIWAN 台灣植物資訊整合查詢系統". tai2.ntu.edu.tw. Retrieved 2019-03-24.
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