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(First upload on August 23 2009. Last on June 7 2019) [ 日本語 | English ]

Cirsium vulgare (Savi) Tenore






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

Cirsium Mill. (アザミ)
Amerika-oni-azami (アメリカオニアザミ, 亜米利加鬼薊), spear thistle / bull thistle
(セイヨウオニアザミ/西洋鬼薊, ヒレオニアザミ, アメリカヒレアザミ)
Life form: annual-biennial forb, forming rosettes
Origin: native throughout Europe and norhtern Africa, and extotic to Japan (Shikoku, Honshu, and Hokkaido)

So, Japanese common name is a little bit strange, becauase 'Amerika' means America
Category A2 in Hokkaido Blue List 2010, firstly reported from Hokkaido in 1960s

Habitat: ruderal

Now we can see this species in various barelands, e.g., volcanoes and over-grazed fields, in Hokkaido) Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト)
→ reproducing conspicuously near the 2000 craters of Mount Usu and Nakajima Island

Seed: 5 mm long, with a pappus → wind dispersal
Chromosome number: 2n = 68, or 102
Synonyms:

C. lanceolatum (L.) Scop., non Hill

索引

Cirsium vulgare in Hokkaido


ST1 ST2 ST3
ST4 ST5 ST6
[1] at a parking lot along a radoside at East Ward (N24/E1) in the city of Sapporo on July 19 2009. [2/3] in a grassland on Nakajima Island on July 21 2005. This species became dominant, owing to the low palatability of deer. Also, it becomes common around the 2000 craters of Mount Usu (Tsuyuzaki & Takahashi 2007). [4] by a parking lot in N16/W4, North Ward, Sapporo, on April 15 2019. [5] along Sakushukotoni River in the experimental farm of Hokkaido University, Sapporo, on July 28 2017. [6] in front of JR Yotsuya Station, Tokyo, on May 26 2017. Records: a rosette at a roadside, N11/W5, North Ward, Sapporo, on April 1 2015.

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