@EvoRulz actually there are only two main types of tea plant for green tea and black tea. The difference in flavours and type mainly come from where these are grown, the conditions of growth, and the following way the leaves are treated and prepared.
So, green teas and black teas are real teas. Herbal, fruit, and root teas are actually infusions, like mint tea (although some mint teas are a blend of mint leaf and black tea leaf so are effectively real teas), camomile, apple, liquorice. It's not really that important whether something is a tea of not as long as you enjoy it (although in Narnia one is judged by ones beverage choices).