EXPERIMENT STATION BULLETINS. 



333 



Fig. 88 (80). 



Hoary Alyssum. Berteroa incana (L.) DC. 

 a pale green, diffuse annual, 30-60 cm. liign, 

 tiirifty, prolific and aggressive: leaves lanceo- 

 late or oblong; petals white, divided, pod ob- 

 long, plump, 2.5-.3.5 mm. long. 



Introduced from Europe, very recently found 

 in Michigan, where it should be looked after 

 without delay. 



Fig. 89 (81). 



Charlock. Brassica arvensis (L.) B. S. P. 

 (B. Sinapistrum Boiss.) An erect, branching, 

 hispid annual, 30-90 cm. high; lower lea\es 

 with petioles pinnatifld; flowers yellow, pod 

 4 cm. long, tipped with a flattened, elongated- 

 conic beak, sometimes one-seeded. Difficult 

 to identify; one mustard is about as bad as 

 another; compare the apex of the pod and the 

 seeds. Introduced from Europe. 



