62 



Fig 22. 



Hound's Tongue, Dog Bur, or Burs. 



Cynoglosaiirii offi-cinale, (L.) 



A biennial weed, with erect hairy stem, of rank growth, and 

 much branched, one to three feet high. The lower leaves have 

 petioles ; the upper ones clasp the stem. They are 6-12 inches long 

 and covered with downy hair, and have a disagreeable odour resem- 

 bling that of mice. The flowers are small and lurid purple-red in 

 color. The fruit consists of a broad, rounded bur, |-inch long, with 

 one flat side and covered with short spines which enable it to adhere 

 to clothing or to animals (Fig. 22a). An average plant produces 

 about 600 seeds. 



Time of flowering, June-August. 



Time of seeding, July-September. 



Dispersal— chiefly by animals carrying the burs. 



Eradication. Spud or cut deep in fall and early spring; the 

 former to destroy the plant in its first year, and the latter to complete 

 the destruction by removing those that escape the first cutting. 



