doob grass

from The Collaborative International Dictionary of English v.0.48

Doob grass \Doob" grass`\ [Hind. d?b.] (Bot.)
   A perennial, creeping grass ({Cynodon dactylon}), highly
   prized, in Hindostan, as food for cattle, and acclimated in
   the United States. [Written also {doub grass}.]
   [1913 Webster]