Ceratostigma plumbaginoides is a flowering shrub native to China. It produces clusters of bright blue flowers in late summer and early fall. The foliage turns a deep red-purple in fall. It is a popular garden plant, valued for its attractive flowers and foliage.

Cephalotus follicularis, commonly known as the Albany pitcher plant, is a carnivorous plant native to southwestern Australia. It has a unique pitcher-shaped structure that traps and digests insects.

Cephalaria gigantea is a giant perennial flowering plant native to the Mediterranean region. It has tall stems with large yellow flowers and is often used as an ornamental plant.

Centranthus ruber, commonly known as red valerian, is a flowering plant native to the Mediterranean region. It is a popular garden plant, grown for its fragrant pink or white flowers.

Centranthus ruber var. coccineus is a species of flowering plant in the Valerian family. It is a perennial shrub with bright red flowers and is native to the Mediterranean region.

Centaurea montana, commonly known as mountain bluet, is a flowering plant native to Europe and Asia. It is a perennial herb with attractive blue flowers that bloom in summer.