harebell; bluebell
Refers to the plant Adenophora triphylla var. japonica, a perennial herb native to Japan. Often called 'harebell' or 'bluebell' in English, though it is not the same as the European harebell.
The harebell blooms bell-shaped flowers in autumn.
Kanji form is rare; the plant is usually referred to in kana.
The Japanese name イトシャジン (糸沙参) literally means 'thread sand ginseng', likely referring to the thin, thread-like roots and its relation to the Adenophora genus (沙参). The exact derivation is uncertain.