Quercus stenophylloides

Quercus stenophylloides
	Acorns and leaves of Arisan oak from Taiwan
Conservation status
	; Least Concern (IUCN 3.1)
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. 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;

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]

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 mature 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

^ 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.
^ "Oldstyle id: 2ad67c76c29e4ee475d1070a9cad259b". Catalogue of Life. Species 2000: Leiden, the Netherlands.
^ 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.
^ ^a ^b ^c ^d ^e "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.

[iucn-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.

[:0-4] "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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