Bitter Leaf Tree (Gymnanthemum extensum)The best use for components of bitter leaf tree (Gymnanthemum extensum, syn. Vernonia amygdalina, Pim Pai Lin; zhan zhi ban jiu ju in Chinese; nan chao woe in Thai) will vary, depending on your ailment and who you ask. It has a number of folkloric uses that vary by different regions throughout the world, especially in parts of Asia and Africa. Leaves of bitter leaf tree can apparently be used for everything from a crispy substitute for salad greens,