DESCRIPTIVE MANUAL 149 



Distribution. — Said to be common in northeastern United States 

 and becoming frequent in other Atlantic states ; found in Mississippi 

 and adjacent states; found not infrequently in Iowa; reported from 

 Ida county in 1912, and said to have been introduced with clover 

 seed. 



Extermination. — Sow clean clover and alfalfa seed. Succumbs 

 readily to cultivation. 



False Flax {Camelina sativa Crantz.). 



Description. — ^An erect annual with single or sparingly branched 

 stem, 1% ft. long, smooth or slightly pubescent stellate hairs ; leaves 

 erect, lanceolate or arrow-shaped, entire or nearly so ; flowers small, 

 yellow, pedicels in fruit spreading ; pod obovoid 4-6 in. long, smooth, 

 reticulated, margined from beak down along placental side with 

 smaller ribs between them ; seeds light brown, 1 line long, minutely 

 pitted, caulicle prominent, running lengthwise with a prominent 

 groove between it and the cotyledons which are incumbent ; on the 

 addition of water seeds become mucilaginous. 



Distribution. — This weed is particularly common in the grain 

 growing sections of the north, as Dakota, Manitoba and Saskatche- 

 wan. In recent years it has become more common in Iowa, par- 

 ticularly in the northern counties. 



Extermination. — Clark and Fletcher recommend the following 

 treatment: "When a crop of winter wheat is infested with false 

 flax, harrowing in the spring kills the young plants without injur- 

 ing the wheaA. A thorough summer-fallow, with cultivation the pre- 

 vious fall and continuous cultivation throughout the summer, is 

 recommended for fields badly infested with this weed. ' ' 



