Webster's English Dictionary

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spirea

spi.rea or spi.raea \spi--'re--*\ n [NL Spiraea, genus name, fr. L, a 
   plant, fr. Gk speiraia] 1: any of a genus (Spiraea) of shrubs of the rose 
   family with small p erfect white or pink flowers in dense racemes, corymbs, 
   cymes, or panicles 2: any of several garden plants resembling spireas; esp 
   : a shrub ( Astilbe japonica) of the saxifrage family