The Collaborative International Dictionary of English v.0.48:

Weigela \Wei"gel*a\, Weigelia \Wei*ge"li*a\, n. [NL. So named
   after C. E. Weigel, a German naturalist.] (Bot.)
   A hardy garden shrub (Diervilla Japonica) belonging to the
   Honeysuckle family, with white or red flowers. It was
   introduced from China.
   [1913 Webster]

WordNet (r) 3.0 (2006):

weigela
    n 1: deciduous shrub widely cultivated for its white or pink or
         red flowers [syn: weigela, Weigela florida]