DESCRIPTIVE MANUAL 



169 



FiQ. 94-B. Horseradish (.Radicula armoracia). Escaped from cultivation; a 



rather persistent weed. 



(Drawing: by Charlotte M. King.) 



Fig. 94-C. Distribution of Horseradish. 



two years, and in this way most of it was removed. Quack grass 

 near the horseradish received the same treatment and was killed in 

 a single season, the season being dry. Yery little progress in de- 

 stroying the plant would have been made in a wet season. 



