agrostis scabra

from The Collaborative International Dictionary of English v.0.48
Flyaway grass \Flyaway grass\ (Bot.)
   The hair grass ({Agrostis scabra}). So called from its light
   panicle, which is blown to great distances by the wind.
   [Webster 1913 Suppl.]
    
from The Collaborative International Dictionary of English v.0.48
Hair grass \Hair" grass`\ (gr[.a]s`). (Bot.)
   A grass with very slender leaves or branches; as the
   {Agrostis scabra}, and several species of {Aira} or
   {Deschampsia}.
   [1913 Webster]
    

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