great St. John's wort; giant St. John's wort
A flowering plant (Hypericum ascyron) native to East Asia. The name is usually written in katakana.
Great St. John's wort blooms yellow flowers in summer.
Usually written in katakana; the kanji form 巴草 is rare.
Kanji form; rarely used.
The name トモエソウ likely derives from the shape of the petals resembling a tomoe (巴) pattern, combined with 草 (sō, 'grass' or 'herb').