(First upload on August 26 2009. Last on September 21 2019) [ 日本語 | English ]

Rorippa sylvestris (L.) Besser

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

Rorippa L. (イヌガラシ)
Kireha-inugarashi (キレハイヌガラシ, 切葉犬辛子/芥子), creeping yellowcress
Yachiinugarashi (ヤチイヌガラシ, 谷地犬辛子)
Life form: creeping perennial forb < 60 cm high
Origin: native throughout Europe (extotic to Japan immigrated probably after 1950s, common in Hokkaido)
Habitat: baregrounds, roadsides, etc., as a weed

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: pinnatifid / Flower: yellow
Chromosome number: 2n = 48 (Howard 1946)
  • Howard HW. 1946. Chromosome number of Rorippa (Nasturtium) sylvestris Nature 158: 666
Radicula sylvestris (L.) Druce
Nasturtium sylvestre (L.)R. Br.

Rorippa sylvestris in Hokkaido

[1/2] on an waste site that was a planned construction site at East Ward (N24/E1) in the city of Sapporo. [1] on July 31 2009. [2] on July 2010. [3] at a park in N11/W2, North Ward, Sapporo, on July 7 2015. [4] flowers at a roadside, N16/W4, North Ward, Sapporo, on June 21 2013. [5] under a street tree in N24/E1, East Ward, Sapporo, on August 28 2019. Records: in a court used for a smoking area in GSEES, HU, on June 22 2020.