EXPERIMENT STATION BULLETINS. 



283 



Fig. 9 (9). 



'^ Sandbur.'* BurTGrass. 'Cenchrus tribuloi- 

 des L. Annual, with flattened spreading 

 branches, about 30 cm. high. Each usually 

 bearing 6-20, haid formidable burs inside of 

 which the grains are produced. 



The numerous, sharp diverging and minutely 

 barbed prickles enable the burs to adhere to 

 fleeces of animals and gain free transportation. 



Sandy fields, borders of streams and lakes, 

 widely distritmted in North America and South 

 America. ■■ 



Fig. 10 (10). 



Bermuda Grass. Scutch Grass. Dog's- 

 tooth Grass. Cynodon Dactylon (L.) Pers. 

 (Capriola Dactylon.) This grass-weed is a child 

 of tne sun and thrives all over hot countries, 

 but at the same time it is a very valuable 

 grass for pastures in the southern United 

 States and is the very best thing to hold the 

 fine soil on the artificial banks bordering the 

 Mississippi. , ... 



The stems creeping on the surface and below 

 are large, stout and wiry, making the land diffi- 

 cult to cultivate. In the southern states, 

 Bermuda grass is the worst weed cotton growers 

 have to contend with. In central Michigan 

 the plant is killed back to the ground with the 

 first hard frost, and during winter it is usually 

 killed several inches below the surface. The 

 succeeding year it starts with great deliberation, 

 scarcely showing itself before July. Its season 

 of about three months gives no promise of value 

 for pasture in Michigan. ..,_., 



When everything is considered, I think 

 quack-grass is one of the worst weeds that 

 vexes the farmers of the state. In a number 

 of places, I know Bermuda and quack grass 

 have come in contact and both have attempted 

 to occupy the same ground at the same time 

 with the result that very little quack grass is 

 left after Bermuda has once taken hold. 



