matricaria(n = noun.plant) genus matricaria - chiefly Old World strong-smelling weedy herbs; comprises plants sometimes included in other genera: e.g. Tanacetum; Tripleurospermum;
A genus of chiefly Old World strong-smelling weedy herbs; it comprises plants sometimes included in other genera, such as Tanacetum and Tripleurospermum. [WordNet 1.5]