i6 



WEEDS OF THE FARM AND GARDEN 



B. Common carriers, Russian Thistle. 



C. Nursery stock and flowers, Canada Thistle. 



D. Hay and wool, Buffalo Bur. 



E. Plants grown for ornamental purposes, and as food plants, 



Ox-eye Daisy, Chicory. 



Wind. Many of our weeds are scattered by the wind. 

 The squirrel-tail grass, which is permitted to grow in an 

 unobstructed manner in pastures and on roadsides, is car- 

 ried to adjacent fields 

 where it did not occur. 

 Tumbleweed and Russian 

 thistle have the rolling 

 habit, and when growing 

 along the roadsides or the 

 railway they get into adja- 

 cent fields. In prairie coun- 

 tries the tumble habit is 

 common for many weeds, 

 as shown many years ago 

 Fig. 7. Bull thistle "seed" scat- by Dr. Bessey. The seeds of 

 tered by the wind. milkweed with a light fluffy 



coma are carried for some distance. The "seeds" of dan- 

 delion with cylindrical body and a tuft of capillary bris- 

 tles are carried for long distances from roadsides to fields 

 and meadows. The bull thistle "seed" with hairy ap- 

 pendage is, carried from the roadside to fields and 

 pastures. 



Wind and Snow. Many seeds glide over the frozen 

 snow and become deposited in the field. Greater ragweed 

 is frequently carried in this way. So, too, are the foxtails. 

 Prof. H. L. Bolley states that January 20, he found in the 

 contents of a snow drift of 28 square feet, 2 seeds of pig- 

 eon grass, 5 of French weed, 2 of biennial wormwood, 

 and 10 of barnyard grass. He also reports having dis- 

 tributed, on January 31, a peck of mixed seeds 30 rods 

 distant from a drift of snow 4 rods long. In 10 min- 

 utes this had caught a large number of millet, IQI 



