spirea

Any of various shrubs of the genus Spiraea of the rose family, having clusters of small white or pink flowers and including bridal wreath, hardhack, and meadowsweet.

Any of many flowering shrubs, of the genus Spiraea, that have clusters of white or pink flowers

The unrelated astilbe

any rosaceous plant of the genus Spiraea; has sprays of small white or pink flowers

a Japanese shrub that resembles members of the genus Spiraea; widely cultivated in many varieties for its dense panicles of flowers in many colors; often forced by florists for Easter blooming