zazanaca.

a plant whose roots are downy and good for fueling a fire; the roots also have a medicinal value believed to alleviate flatulence, expel worms, and cure diarrhea

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), 138.