Warm Acrid Herbs that Release the Exterior

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Which of the following herbs warms the middle-jiao to treat vomiting due to cold?
Sheng Jiang is ginger. Even people who don't study Chinese medicine take ginger tea for upset stomach. But because you study Chinese medicine, you should remember that it's only for nausea and vomiting due to cold, not heat.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 31 [Q330]