WEEDS 



in the spring and dies the same season. Familiar examples 

 are : dodder, pigweed, bindweed (wild morning glory), 

 wild mustard, ragweed, Russian thistle, shepherd's purse. 

 (6) Biennials in the first season produce only a short 

 stern, leaves, and a thick root. From this root, in the 

 second year, the plant shoots up, flowers, produces seeds, 

 and then dies. The common thistle, dandelion, moth 



mullein, teasel, carrot, 

 and wild parsnip are 

 biennials. 



c. Perennials live on 

 from year to year, the 

 underground part sur- 

 viving the winter. 

 " Live-forever," Canada 

 thistle, quack grass, 

 Johnson grass, plantain, 

 oxeye daisy, sorrel, and 

 toadflax are common per- 

 ennials. 



A few plants may be- 

 long to two classes, ac- 

 cording as the conditions 

 are favorable for their 

 growth. The dandelion, 

 for instance, may be 

 either a biennial or a 

 perennial. 



215. How to Get Rid of Weeds. Two points must be 

 borne in mind when one wishes to destroy a weed: First, 

 to which of the three classes does it belong, or how long 

 does it live ? Second, how does it reproduce and spread ? 

 Annuals need only to be prevented from flowering ;ind 

 going to seed. Nature will kill them at the end of the 



RAGWEED. 



