Species in the genus Chelidonium:

Chelidonium dubium / Nagamihinageshi
Chelidonium japonicum / Yamabukisou
Chelidonium majus ssp. asiaticum / Kusanoou

Chelidonium majus ssp. asiaticum / Kusanoou クサノオウ

Chelidonium majus ssp. asiaticum, a biennial herb inhabiting sunny locations, such as roadsides, grasslands, forest edges, etc., grows 30-80cm tall. The whole is hairy throughout, which causes looking whitish. Leaves split once or twice like a feather, and yellow flowers come out in spring to mid-summer, measuring 3-4cm in diameter. Some individuals have notched petals. Bloom time: April-July.