iztacxihuitl.

an herb, also called tecacapan or chichihua xihuitl and, in Spanish, nun's kiss; said to cure eye trouble, provoke urine, and expel retained semen

The Mexican Treasury: The Writings of Dr. Francisco Hernández, ed. Simon Varey, transl. Rafael Chabrán, Cynthia L. Chamberlin, and Simon Varey (Stanford: Stanford University Press, 2000), 147–148.