sisal grass

from The Collaborative International Dictionary of English v.0.48

Sisal grass \Si*sal" grass`\, Sisal hemp \Si*sal" hemp`\,
   The prepared fiber of the {Agave Americana}, or American
   aloe, used for cordage; -- so called from Sisal, a port in
   Yucatan. See {Sisal hemp}, under {Hemp}.
   [1913 Webster]