noun. any rosaceous plant of the genus Spiraea; has sprays of small white or pink flowers.
noun. a dicotyledonous genus of the family Rosaceae.
noun. 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.
1. Noun, singular or mass Because of its extremely specific habitat requirements and poor vegetative reproduction, as well as changes in stream water and creek characteristics, the Appalachian spiraea has become severely endangered.