(First upload on January 1 2013. Last on January 26 2016) [ 日本語 | English ]

Aster subulatus Michx.

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

Aster L. (シオン)
Aster subulatus Michx. (ホウキギク, s.l.)
Houkigiku (ホウキギク, 箒菊), wild aster
Lifeform: annual/biennial forb
Distribution: native to the eastern North America (exotic to Japan)
Habitat: disturbed sites, including parking lots and gardens
var. subulatus (ホウキギク, s.s.)
Leaf: 0.5-1.0 cm wide

Symphyotrichum subulatum (Michx.) G.L.Nesom var. subulatum

var. elongatus Bosserdet ex A. G. Jones et Lowry (オオホウキギク)
Flower: > 1 cm in diameter
var. sandwicensis (A. Gray ex H. Mann) A. G. Jones (ヒロハホウキギク)
Leaf: 0.8-2.5 cm wide
A. subulatus Michx. var. sandwicensis (A.Gray et H.Mann) A.G.Jones × var. subulatus (ムラサキホウキギク)

Aster subulatus in Japan

var. subulatus (ホウキギク)

Aster1 Aster2
[1/2] near a ditch at a parking lot in front of the arrival gate of Kobe Airport on September 18 2012.

var. sandwicensis (ヒロハホウキギク)

Aster1 Aster2 Aster3
[1-3] on a paved road adjacent to Hama-rikyu Gardens, Tokyo, on November 13 2015.