34 



BOTANY OF LA SALLE COUNTY. 



met every day on most plants. In many cases, 

 especially in the asters and golden rods the root and 

 stem leaves being- very different, so different in some 

 cases that it would not seem that they belong 1 to the 

 same plant did we not find them there. If there are 

 leaves near the ground be sure to examine them as 

 they must be reg-arded as the true leaves, the upper 

 ones as modified forms of these. 



Abreviations and Explanations, The follow- 

 ing- abreviations are used throughout this flora: 



Quantity of Seed Produced by Plants. But 



few of those who observe and cultivate plants have 

 any idea of the quantity of seed they produce. 



An apple tree may produce several thousand apples, 

 .say 2,500, and each of these may contain 10 seeds, and 

 will probably averag-e 8, so that this tree in a sing-le 

 year produces 20,000 seeds, and if half of these g-erm- 

 inate, it would g-ive orig-in to 10,000 trees each year, 

 enough to plant 250 acres. 



