May lily of the valley or common lily of the valley (Convallaria majalis) is a species of perennial herbaceous plants from temperate regions whose spring flowers, small and white, form clusters of very fragrant bells.

It is a very poisonous, even deadly plant. In the temperate European zone, in the forest, where its presence is natural, lily of the valley would be (along with periwinkle) a good bioindicator of the age and naturalness of the forest. Lily of the valley blooms in the spring.

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