BLACK MUSTARD— F1VE-FIXGER 25 



are quite variable in shape and size. They are slightly flattened on 

 one side with a deep groove on the opposite side. The color of the 

 seed is reddish yellow. The seed of false flax is found most com- 

 monly in the seed of ordinary cultivated flax. 



Eradication. — If false flax is found thinly in grain or flax fields, 

 pull it out by hand. Where the land is badly infested, give surface 

 cultivation in the fall and spring. If an early crop can be removed, 

 fallowing for the balance of the season will give good results. Rota- 

 tions including grass crops will help in eradicating, if one or two 

 crops of hay can be cut. Sow clean seed. 



Black Mustard (Brassica nigra L. Koch) 



Other common names. — Brown mustard, grocer's mustard, cad- 

 lock, kerlock, and warlock. 



Description. — Black mustard, an annual weed, is a very close 

 relative to the ordinary wild mustard or charlock which is so com- 

 mon throughout the State, but is not so widely distributed as the latter. 

 The plant is different in many respects. The leaves and stem are 

 smoother, the foliage is darker than that of the other mustards 

 and the plant grows much taller, often reaching a height of seven 

 feet. The plant flowers from June to September, somewhat later 

 than the common mustard, and the seeds are ripe in August. The 

 seed pods are quite short and are more or less four-angled. There 

 are about six almost spherical, red or dark brown seeds in each pod. 

 They are often elongated, and the surface is slightly roughened. 



Eradication. — As in the case of other annuals, black mustard 

 should be prevented from seeding. Seed grain should be carefully 

 cleaned so that no mustard seed will be sown. Hand-pulling is effec- 

 tive for stray plants. Frequent cultivation when the plants are young 

 will destroy them in cultivated fields. The methods of eradication 

 advised in Bulletin 129 of this Station for common mustard give 

 good results in combating this weed. 



Five-Finger (Potentilla monspeliensis L.) 



Other common names. — Cinquefoil, Norwegian cinquefoil, up- 

 right cinquefoil, and barren strawberry. 



Description. — Five-finger belongs to the rose family and may be 

 either annual or biennial. It grows in both dry and moist soil and 

 is found commonly in meadows, cultivated fields, and waste places. 

 It is quite generally distributed throughout the State. It begins 



