Genus Spiraea and Spiraea

Genus Spiraea noun - A dicotyledonous genus of the family Rosaceae.

Spiraea and genus Spiraea are semantically related. In some cases you can use "Spiraea" instead a noun phrase "Genus Spiraea".

Spiraea 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.

Genus Spiraea and spiraea are semantically related. You can use "Genus Spiraea" instead a noun "Spiraea".