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Camellia is a genus of flowering plants in the family Theaceae. They are found in eastern and southern Asia, from the Himalayas east to Japan and Indonesia. There are 100–250 described species, with some controversy over the exact number. The genus was named by Linnaeus after the Jesuit botanist Georg Joseph Kamel, who worked in the Philippines, though he never described a camellia. This genus is famous throughout East Asia.  Source

Camellia sinensis is the species of plant whose leaves and leaf buds are used to produce the popular beverage tea. It is a genus of flowering plants in the family Theaceae. White tea, yellow tea, green tea, oolong, pu-erh tea and black tea are all harvested from this species, but are processed differently to attain different levels of oxidation. Kukicha (twig tea) is also harvested from Camellia sinensis, but uses twigs and stems rather than leaves. Common names include tea plant, tea shrub, and tea tree (not to be confused with Melaleuca alternifolia, the source of tea tree. There are two major varieties used for tea: Chinese tea, Camellia sinensis var. sinensis, and Assam tea, Camellia sinensis var. assamica.  Source