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]