Chamaemelum nobile and cvs.
A hardy perennial, chamomile has aromatic, threadlike leaves that fill the air with a pleasing apple-pineapple scent. White, daisylike blooms appear in summer. The cultivar 'Treneague' is valued because it does not flower, making an attractive lawn. 'Flore Pleno' has double flowers showier than those of the species.