(First upload on March 28 2010. Last on December 28 2020) [ 日本語 | English ]

Brassica napus L.

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

Brassica L. (アブラナ)
Seiyou-abrana (セイヨウアブラナ, 西洋油菜), rapeseed
Nanohana (ナノハナ, 菜ノ花)
Natane (ナタネ, 菜種)

Lifeform: biennial forb
Distribution: Native to north Europe and Sibera (exotic to Japan)
Habitat: ruderal

Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト)
HUSTEP: Plants and Plant communities in Japan (flora list)

Leaf: pale green due to bloom ↔ B. rapa: green
Chromosome number: 2n = 38
Use: vegetable
Varieties (Cultivars):
var. napobrassica (L.) Peterm. (スウェーデンカブ), rutabaga

Brassica napus in Japan

S1 S2 S3
S4 S5 S6
S7 S8 S9
[1] at a roadside, N24/E1, East Ward, Sapporo, on October 28 2009. [2] at Hibiya Park, Tokyo, on December 27 2014. [3] at a small garden in front of the Usujiri Fisheries Station of Hokkaido University, southern Hokkaido, on May 2 2017. [4] under a street tree near Jr Ikebukuro Station, Tokyo, on March 14 2017. [5/6] near the Suruga Ohashi Bridge (駿河大橋), Shizuoka City, central Japan, on March 6 2013. [7] in Wakakusa Park, N25/W7, North Ward, Sapporo, on November 6 2020. [8/9] at a house side, probably used for a house garden, along a street on N16/W4, North Ward, Sapporo, on July 15 2016. The yellow flowers in Photo #9 is Xanthophthalmum coronarium. Records: on a bank along Sophia Street, Chiyoda Ward, Tokyo, on May 24 2019.