also: ペンペングサ
shepherd's purse
A common weed with heart-shaped seed pods; the name mimics the sound of a shamisen (ぺんぺん) because the pods resemble the instrument's plectrum. Also known as なずな.
See also: ナズナ
In spring, a lot of shepherd's purse grows along the roadside.
The seed pods of shepherd's purse are said to resemble a shamisen plectrum.