View photos of the medicinal plant Poliomintha incana (Frosted mint), profiled in Medicinal Plants of the American Southwest.

A passage from Medicinal Plants of the American Southwest:

Use Poliomintha like Pennyroyal (Mentha pulegium) and Western pennyroyal (Hedeoma spp.). Whole plant preparations have  predictable effects on a number of systems. Through its carminative influence, taken with or after meals, Poliomintha diminishes stomach distension and related gas and bloating.