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withered completely. By July the prai- 

 rie grasses have turned to hay. The 

 summer and autumn bring forth few 

 plants except among the hills, where the 

 growing season is much later than on 

 the plains. 



Plants of roadsides and waste places. 

 The visitor to Colorado who may be 

 interested in plants is likely to be sur- 

 prised at the great number of familiar 

 weeds to be seen in vacant lots 

 and neglected places in cities and 

 towns. Everywhere east of the divide, 

 at altitudes not greater than 1,700 

 meters, many of the commonest plants 

 are identical with those of the states 

 farther east. One may see in early 

 spring the dandelion, shepherd's purse, 

 peppergrass and Lappula and later in 

 the season the round -leaved mallow, 

 sweet clover, barnyard grass, pigeon 

 grass, species of Poa, red clover, plan- 



