There are at least 199 natural tea hybrid species identified in Yunnan Province alone. The indigenous Ye Sheng cha is an example known for its potent flavor and cha qi – or the energy the tea imparts to its drinker. " Mu Shu", “Lao Shu”, “Qiao Mu” or “Gu Shu”, also known as "Mother Tree", “Old Tree” “Old Arbor” or “Ancient Tree” teas are harvested from plants that can be 80-1000 years old. These ‘Hardened Warriors of the Forest” are thought to embody the spiritual qualities of strength, resilience, abundance and wisdom, having survived the ravages of time. "The older the tree, the deeper the root, the more flavor the tea."