Creeping yellowcress
Rorippa sylvestris (L.) Besser [Brassicaceae]
Kireha-inugarashi (キレハイヌガラシ, 切葉犬辛子)
Life form: perennial forb
Origin: native throughout Europe (extotic to Japan immigrated probably after 1950s, common in Hokkaido)
Habitat: ruderal weed
Rorippa sylvestris in Hokkaido
[Top/Left] A colony on July 31 2009. [Top/Right] Flowers in the evening of July 30 2009. [Bottom/Left] leaves on July 2010. [Bottom/Right] flowers on July 3 2010. On an waste site that was a planned construction site at East Ward (N24/E1) in the city of Sapporo.