conyza squarrosa

from The Collaborative International Dictionary of English v.0.48

Plowman \Plow"man\, Ploughman \Plough"man\, n.; pl. {-men}.
   1. One who plows, or who holds and guides a plow; hence, a
      husbandman. --Chaucer. Macaulay.
      [1913 Webster]

   2. A rustic; a countryman; a field laborer.
      [1913 Webster]

   {Plowman's spikenard} (Bot.), a European composite weed
      ({Conyza squarrosa}), having fragrant roots. --Dr. Prior.
      [1913 Webster] Plowpoint