View photos of the medicinal plant Mentha spicata (Spearmint), profiled in Medicinal Plants of the Western Mountain States and Herbal Medicine: Trends and Traditions.

A passage from Medicinal Plants of the Western Mountain States:

Prosaic in application, Spearmint should first be thought of as a gentle carminative, soothing to indigestion, gas pain, and nausea. The tea can be used liberally in these cases. Even for colicy babies a tablespoon or two of the tea will be found relieving.