Herbs that Release the Exterior

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Which two herbs warm the Lung? For cough with copious sputum due to cold.

Qiang Huo (notopterygii rhizoma seu radix) and Gao Ben (ligustici rhizoma)
Bai Zhi (angelicae dahuricae radix) and Xin Yi Hua (magnoliae flos)
Ma Huang (ephedra herba) and Gui Zhi (cinnamomi ramulus)
Xi Xin (sari radix et rhizoma) and Sheng Jiang (zingiberis rhizoma recens)

Sheng Jiang is ginger, and Xi Xin is Chinese wild ginger. They both warm the Lung. This is especially useful when wind-cold obstructs the dissemination of Lung qi causing cough, or when cold causes the fluids to congeal into phlegm

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 28 [Q910]