Campanula n. : A large genus of plants bearing bell-shaped flowers, often of great beauty; -- also called bellflower.

Example:
Can you control root systems of "invasive" plants by planting in containers such as mint, Campanula, yarrow

Taxonomy
Campanula, species, unranked, free encyclopedia, genus Campanula, the leaves, bellflower, stem, sepals, appendage, Campanulas, alpine species, leaf margin, Campanula rotundifolia, Campanula medium, the United Kingdom, Campanula rapunculus, Wild Flowers of Britain and Northern Europe.

Defination from the web:
campanula is Latin for "little bell" ... Campanula species are used as food plants by the larvae of some Lepidoptera species including Common Pug (recorded on Harebell), Dot Moth, ...