(First upload on August 28 2007. Last on November 26 2015) [ 日本語 | English ]

Phragmites australis (Cavanilles) Trinius ex Steudel

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

Phragmites Adans. (ヨシ)
Yoshi (ヨシ, 葦), reed
Ashi (アシ)
Lifeform: perennial grass
Distribution: common in the northen hemisphere
Habitat: wet sites, represented by reed swamp. Many crater lakes on Mount Usu are now dominated by P. australis (Tsuyuzaki, S.1997)
Shoot: producing belowground stoloniferous shoots only ↔ P. japonica

Phragmites communis Trinius

ssp. americanus Saltonstall, Peterson et Soreng (native to North America)
ssp. australis (native to Eurasia)

Phragmies australis in Japan

Phragmies1 Phragmies2
[1] in Hotoke Bog, Aomori Prefecture, on July 1 2007, by H. Kimura. Here, a wildfire occurred in early April (Kimura, H. & Tsuyuzaki, S.2011). Reeds usually grew more than 1 m in height by late summer in Japan. Even in the early stage of succession, this species could be dominant and created wetland on Mount Usu where the ground surface was covered with sufficient water. [2] A typical reee swamp in Makunbetsu wetland, Sapporo, on April 24 2010. This species does not develop seedbank (埋土種子) in various wetlands (Egawa et al. 2009).

Phragmies3 Phragmies4 Phragmies5
Phragmies6 Phragmies7 Phragmies8
[4] an rehabilitated area where Solidago canadensis and other exotics invaded. [3-6] the rehabilitation of P. australis fen was conducted at Yodogawa Riverside Park on October 29 2011. [7] near Akanuma (Red Bog) in Kushiro Mire, eastern Hokkaido, on August 30 2014. [8] in Hama-rikyu Gardens, Tokyo, on November 13 2015. Discard: in Inokashira Park, Mitaka, Tokyo, on January 15 2015. Record: on a small hill in an area for establishing a thermal power plant on the Okotsu District (興津) of Kushiro City, western Hokkaido, on September 26 2017.