(First upload on September 5 2013. Last on June 26 2014) [ 日本語 | English ]

Zelkova serrata (Thunb.) Makino

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Zelkova Spach (ケヤキ)
Six species in the world (1 species in Japan)
Zelkova serrata (Thunb.) Makino
Keyaki (ケヤキ, 欅), Japanese zelkova
Lifeform: deciduous tree < 30 m high
Distribution: Russia - China - Taiwan - Korea - Japan (except Hokkaido) - Kuril
Habitat: forests
Utilization: street tree (common in Kanto District), and high-quality wood

Zelkova serrata (Thunb.) Makino var. formosana (Hayata) Hatus.

f. stipulacea (Makino) K. Ito (メゲヤキ)
Mount Takao

The representative tree of Musashino (and Japan)
The leaf has two functions:

  1. photosynthesis
  2. disseminule: leaves attached with seeds assist seed dispersal for long distance like maple seeds

Leaf flushing: mid-April
Autumn color: October (from green to pale brown through yellow)

Zelkova serrata in Japan



[1] at a trail to go Yakuo-in Shrine on Mount Takao (599 m elevation), Tokyo, on October 21 2013 → Mount Takao forest for recreational use (高尾山自然休養林). [2] a giant tree (巨木) at Inuzuka (Osaka Path), Otsu City, western Japan, on March 19 2012. [3-5] at Yushima Temple (seido), Tokyo, on May 30 2014.. [3] a bark (樹皮). Discard: a bark close to the Red Gate (Bldg-2) at the University of Tokyo on May 11 2013