nanacace.

an "angular plant" or "plant with corners" -- this was an herb believed to have medicinal value; it grows in temperate places such as Xochimilco; used to cure fevers by provoking sweat, and to move the bowels, stop fluxes, and stop bleeding in the bowels
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), 142.