(First upload on November 17 2010. Last on October 24 2015) [ 日本語 | English ]

Echinochloa crus-galli (L.) P. Beauv.

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

Echinochloa P. Beauv. (イヌビエ)
Inubie (イヌビエ, 犬稗, s.l.), cockspur (cockspur grass)
Lifeform: turfed, weedy annual grass
Distribution: Originally in tropical Asia and Africa (ancient exotic to Japan)
Habitat: disturbed areas, such as roadsides, ditches, and furrows of paddy fields
Chromosome number: 2n = 54
Synonyms (discarded):

Echinochloa crus-galli (L.) P.Beauv. var. caudata auct. non (Roshev.) Kitag.
Echinochloa crus-galli (L.) P.Beauv. var. austrojaponensis Ohwi

Varieties (diverse and confusing)
var. aristata Gray (ケイヌビエ)

f. kanashiroi Ohwi (ウスゲケイヌビエ)

var. crus-galli (イヌビエ, s.s.)
var. formosensis Ohwi (ヒメタイヌビエ), south to Kanto District
var. praticola Ohwi (ヒメイヌビエ)

Echinochloa crus-galli in Hokkaido

var. crus-galli

[1] at Shirogane Falls, Ofuyu Cape, on October 12 2010. [2/3] in front of the backgate of Hokkaido University of Education at Hakodate on September 20 2011. [4] at a roadside between Japanese archery training house and tennis courts, HU, on August 20 2015. [5/6] at a waste land, N20/W7, north Ward, Sapporo, on August 31 2012. Record: on a grassland in Fujimi Road Station, northern Hokkaido, on August 29 2018.; in a mesic waste land on N25/W3, North Ward, Sapporo, on August 31 2018. along a paved road in N12/W2, North Ward, Sapporo, on October 8 2020. On a sandbar along Kimonbetsu River close to JR Date-Monbetsu Station, Date City, southern Hokkaido, on October 8 2020. Fruiting near Faculty of Health Sciences, HU, on August 25 2022.

var. aristata

[1/2] at a garden by Sub-Ranger House, Toyotomi Town, on October 13 2010. Because this garden is frequently cut for keeping a lawn, the plants become shorter than usual.