It says that it is used to make pulque.....which somehow sounds worse (or better) than tequila....says that tequila is only made from the "blue agave"....not sure what that is.
Pulque is a milk-colored, somewhat viscous liquid that produces a light foam. It is made by fermenting the sap of certain types of maguey (agave) plants. In contrast, mescal is made from the cooked heart of certain agave plants, and tequila, a variety of mescal, is made all or mostly from the blue agave. There are about six varieties of maguey that are best used for the production of pulque. The name “pulque” is derived from Nahuatl. The original name of the drink was “iztac octli” (white wine), the term pulque was probably mistakenly derived by the Spanish from the “octli poliuhqui” which meant "spoiled wine".