The Collaborative International Dictionary of English v.0.48:

Matricaria \Matricaria\ prop. n.
   A genus of chiefly Old World strong-smelling weedy herbs; it
   comprises plants sometimes included in other genera, such as
   Tanacetum and Tripleurospermum.

   Syn: genus Matricaria.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Matricaria
    n 1: chiefly Old World strong-smelling weedy herbs; comprises
         plants sometimes included in other genera: e.g. Tanacetum;
         Tripleurospermum [syn: Matricaria, genus Matricaria]