View photos of the medicinal plant Aloysia wrightii (Beebrush), profiled in Medicinal Plants of the American Southwest.

A passage from Medicinal Plants of the American Southwest:

The tincture or the tea taken before meals is a functional and aromatic bitter. Through reflex, in response to bitterness, digestive secretions (particularly pepsinogen and hydrochloric acid) are stimulated. Blood flow is shifted to the stomach walls by the dilating nature of the plant’s aromatics.