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Quercus stenophylloides

Species of plant

Species of plant

  • 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. It is placed in Quercus subgenus Cerris, section Cyclobalanopsis.

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.

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. There are 9–17 pairs of lateral veins. Petioles are 1–2.3 cm (0.4–0.9 in) long.

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.

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.

Distribution

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

References

References

  1. Carrero, C. 2020. [https://www.iucnredlist.org/species/78976949/78976963 ''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. {{Catalogue of Life. 2ad67c76c29e4ee475d1070a9cad259b
  3. (2017). "Appendix 2.1: An updated infrageneric classification of the oaks".
  4. "狹葉櫟 Cyclobalanopsis stenophylloides - Plants of TAIWAN 台灣植物資訊整合查詢系統".
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