27 



No. 68. Cenchrus tribuloides Linn. Saud-bur. (Fig. 27.) 



A widely distributed grass growing in sandy soils along river bants, tie seasliore 

 and more or less scattered tbroughout tbe interior of tbe country in sandy dis- 

 tricts. It is one of tbe w orst of annual weeds wherever it becomes abundant. 

 The prostrate branching stems are 1 to 2 feet long ; tbe spikes are composed of 

 10 to 15 strongly spiny burs, which readily become detached and adhere to 

 passing objects. No pains should be spared in efforts to exterminate this grass 

 wherever it makes its appearance. 



No. 69. Chaetochloa glauca (Linn.) Scribn. Yellow Foxtail. (Fig. 28.) 

 An erect annual, 1 to 2 feet high, with flat leaves, and a bristly, cylindrical, s])ike- 

 like, densely flowered panicle 1 to 3 inches long. Tliis grass is widely distrib- 

 uted throughout the tropical and warmer temperate regions of the world, grow- 



FiG. 26. — Tooth ach(> - s v » s s 

 ( Oainpvloiiu>i arotnaticus). 



Fifi. 27.— Sand-bur {Cenehrus tribu- 

 loides). 



Fig. 28.— Yellow 

 Foxtail (Chceto- 

 chloa glauca). 



ing as a weed in cultivated grounds. It is especially common in the Southern 

 States, where it continues t<> bloom throughout the season, from June to Octo- 

 ber. It is distinguished from Seta^-ia viridis by its somewhat larger sjiikelets 

 and more widely spreading yellowish bristles. 



No. 70. Chaetochloa italica (Linn.) Scribn. Millet; Hungarian-grass. (Fig. 30.) 

 This grass, in some of its varieties, has been cultivated in the East for many centu- 

 ries, and in some parts of India and Trans-Caucasia it still forms an important 

 article of food. Its culture extends back to an early date in Egypt, and in the 

 lake dwellings of the stone age it is found in such quantities that it must be 

 regarded as tbe main bread supply of the prehistoric peoples (Hackel). In 

 Europe and in this country it is cultivated to some extent for fodder and for the 



