Wahlenbergia
Wahlenbergia, a group of annual and perennial plants native mainly to Europe and Asia. They bear nodding, bell-shaped flowers, commonly one to a stalk. A number of perennial wahlenbergias, known as tufted bells, are grown in rock gardens. They reach one to eight inches (2.5 to 20 cm) in height.
Wahlenbergia is a genus of the bellflower family, Campanulaceae.