Shunan Teng’s job can be precarious, since she spends a lot of her time hiking the rocky slopes of southern China. On one hike, she gingerly hoists herself into the branches of a camellia sinensis tree in order to inspect the baby leaves. But it’s all in a day’s work for Teng, an avid tea sommelier and entrepreneur. Teng is on a mission to curate a collection of China’s oldest and most historically acclaimed teas. While the densely packed brush surrounding her looks like a forest, it’s actually a centuries-old…