ILLUSTRATED GUIDE. 79 



Platanus Ocxidentalis — Button-wood. 



In rich, alluvial soils, and on river-banks, this tree does 

 well. Eighty feet is its usual height. The seed ripens in 

 autumn, and keeps well in a dry state. Spring is the 

 proper season for sowing it, and the covering of earth 

 should be slight. A pound of the seed contains 

 about three hundred thousand pickles, of which about 

 twenty per cent, grow. When young, the plants 

 require protection, but they may be set out in the 

 nursery at the end of a year ; and three years 

 from sowing may occupy the place of their per- 



6i. — Leaf and nut of butternut. 



manent abode. The button-wood is said to grow as 

 fast as the poplar, and is equally suited to the system 

 of propagation by cuttings. Its wood is, in quality, 

 &c., equal to that of the maple ; and as an ornamental 

 tree, it is very beautiful. Engraving No. 68, p, 83 

 displays the leaf and seed-ball of the button-wood, 

 and No. 69, p. 84, the seed-ball with a seed. 



Populus Grandidentata — Large-toothed Aspen. 



This poplar raiely exceeds a height of forty feet by 

 fifteen inches in diameter. The details of its treatment 

 will be found in the chapter devoted to a summary of 

 the species common to all the provinces. 



