Camellia is a genus of over 100 species, all native to Asia. Many are ornamental, but three of them (Camellia japonica, C. reticulata, and C. sasanqua) are the source of most Camellia cultivars available today. A wide range of flower colors and forms has been bred from these species. Camellias are generally easy but very slow-growing. Eventually they develop into attractive shrubs or small trees. Camellia sinensis, the tea bush, is the source of tea leaves for world markets.