Pennisetum typhoideum

from The Collaborative International Dictionary of English v.0.48

Cuscus \Cus"cus\, n. [The same word as {Couscous}, fr. F.
   couscous couscous, Ar. kuskus.] (Bot.)
   A soft grass ({Pennisetum typhoideum}) found in all tropical
   regions, used as food for men and cattle in Central Africa.
   [Webster 1913 Suppl.]