332 
Perennials are those which live on indefinitely year after year, repro- 
ducing from seed, or, in addition, from buds near the crown of the plant, 
as in buckhorn, or from buds here and there along running underground 
parts as in Canada thistle. Many perennials are persistent and particularly 
Twitch or Couch Grass. 
noxious. Here belong horse nettle or sand brier, twitch or couch grass, 
sour dock, sheep sorrel, field bindweed or wild morning glory, ox-eye 
daisy, yarrow, wild barley, black-seeded plantain and others. Farmers and 
other property owners are urged to acquaint themselves with the common 
weeds, their names and characteristics, for on these latter in a large meas- 
