From 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]
From 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]