KINDS OF WEEDS AS TO DURATION 9 



Canada thistle, morning-glory, and horse nettle, a small 

 part of the underground portion is stem, the rest being 



Fig. 3. Pigeon grass, a type of annual plant. (U. S. Dept. Agrl.) 



true root. On these roots buds are produced which send 

 up new shoots each year. 



Some plants, like wild onion, produce bulblets. In 

 others, as crab grass, the stem above the ground may 



