Both of the following herbs possess white rays and yellow centers, are members of the composite, or daisy, family, and are sold in their desiccated state:

Manzanilla, or chamomile, known scientifically as Matricaria chamomilla, is cherished by Mexicans as much as by Northerners as a nerve-soothing tea.

Santa María, or feverfew, is technically a kind of chrysanthemum, Chrysanthemum parthenium. The tea resulting from brewing Santa María isn't drunk for its taste, but rather for its medicinal value. Mexicans use it to encourage menstruation, help cramps, soothe the nerves, and as a tonic. The natural insecticide pyrethrum is derived from Chrysanthemum flowers.