Herbs that Release the Exterior

Besides releasing the exterior, which herb also spreads Liver qi and relieves constraint?

Chai Hu is acrid and dispersing, so it can move and disperse Liver qi stagnation. It is commonly used in formulas for Liver qi stagnation.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 73. [Q922]