Green alkanet blooms in spring and early summer. Its stamens are hidden inside narrow flower-tubes which end in a white eye in the centre of a blue flower.
绿朱草花期在春末夏初。花开时，雄蕊会藏于花房中，给紫色的花朵留出一个“白色眼睛”。
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Ginkgo wood vinegar was a kind of quite complicated compounds, which include water, organic acid, phenol compound, alkanet compound, alcohol compound and so on.