The beverage we know as "tea" comes from the leaf of a species of camellia which is believed to have originated in Szechuan.
It may have been cultivated as early as 350 B.C. Tea is a shrub that grows wild underneath tall trees in the forest. All tea comes from the camellia sinensis, but it is treated differently in processing to make black or green tea. To make green tea, the freshly picked tea is steamed immediately to stop fermentation.