Where does our tea come from?

Ok. So I was doing some research on where tea comes from. And I thought that tea might come from lots of different types of plants due to the number of different kinds of teas in the world. Well I was wrong! All tea comes from the same plant! It's called Camellia Senesis. The only part that changes are the methods of harvesting. Often times tea is hand picked and only certain parts of the leaves and stems are used depending on the type of tea is being produced at the time. Silver Needle, for example, only uses the last bit of the stem on the tallest leaf of each plant. Only one is picked from each bush or plant to make silver needle. Whereas, oolong teas and others like it, the entire leaf is used and it doesn't matter how many are harvested from each plant as long as they are healthy and aren't damaged in any way.