DESCRIPTIONS OF SOME COMMON WEEDS 



241 



number; achenes obovate-oblong and slightly curved; 

 disk achenes one-nerved down the side. A viscid excre- 

 tion from this plant injures everything coming in contact 

 with it. Found on Californian coast. 



Fig. 153. Young plant beggar-ticks (Bidens frondosa). (Am. Steel 

 and Wire Co.) 



Sneezeweed (Plelenium antumnale, L.). A smooth or 

 pubescent perennial one to six feet high ; leaves toothed, 

 lanceolate to obovate, oblong, decurrent on the stem, 



