(First upload on August 28 2007. Last on October 18 2021) [ 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

Phragmies01 Phragmies02 Phragmies03
Phragmies04 Phragmies05 Phragmies06
Phragmies07 Phragmies08 Phragmies09
[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 higher than 1 m 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 reed 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). [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 (旧浜離宮庭園), Tokyo, on November 13 2015. [9] belowground organs in a post-mined peatland in Sarobetsu mire, northern Japan, on August 30 2021. Records: in Inokashira Park, Mitaka, Tokyo, on January 15 2015. 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. Flowering on Sosei River in N11, Sapporo, on September 7 2022.