Matricaria is a genus of flowering plants in the chamomile tribe within the sunflower family. Some of the species have the common name of "mayweed", but this name also refers to plants not in this genus.

Anthemideae is a tribe of flowering plants in the family, Asteraceae, and the subfamily Asteroideae. They are distributed worldwide with concentrations in central Asia, the Mediterranean Basin, and southern Africa. Most species of plant known as chamomile belong to genera of this tribe.