The Narrow-leaf bittercress (Cardamine impatiens) belongs to Brassicaceae (the Mustard family). It is a biennial herb that is widely distributed in the temperate and warm-temperate regions of the Northern Hemisphere, including various parts of Japan. This herb grows in the shade of mountains and in moist places, and can reach 20-40 cm in height. The leaves are odd pinnate compound, and the leaflets are further split into medium to deep shards. From March to June, small cruciform flowers bloom on the racemes at the tips of the stems.