ケシ科クサノオウ属の一年草で、学名は Chelidonium majus var. asiaticum (syn. Chelidonium majus ssp. asiaticum)。英名はありません。
The "Kusa-no-oh" (Chelidonium majus var. asiaticum) belongs to Papaveraceae (the Poppy family). It is an annual herb that is native to Japan and the temperate area of Asia Esia. This herb grows in fields or forest edges and can reach 40-80 cm in height. The flowers are bright yellow and appear from May to July. The Japanese name comes from the yellow milky juice that is produced when the plant body is injured. It is also said to have medicinal properties to cure the skin disease "kusa" (eczema), hence the name "king of acne". In Chinese, it is called "白屈菜" (bai qu cai).