KMY-FBDITS 



271 



in each locule. 

 Figs. 262 and 



Pia. 262. 



Key of 

 sugar maple. 



Mature fruits of maples are seen in 



263. Each lobe has grown into a 



long, winged body, with only 



one seed, and the twin fruit 



suggests a pair of saddle-bags. 



Dry indehiscent winged fruits are 



known under the general name 



of key -fruit or samara. 



Fig. 263. 

 Black maple. 



319a. The pupil should deter- 

 mine if the wings of the maple 

 fruit serve any purpose in dis- 

 tributing and planting the seed. 

 How do the fruits behave when 

 torn from the tree by wind ? In what position 

 do the fruits strike the ground ? If the pupil has 

 access to a large sugar maple tree which produced 

 a good crop of fruit, let him examine the ground 

 about the tree very early in the spring, in the 

 endeavor to find the seeds. If the ground is loose or cultivated, 

 the planting operations will be more conspicuous and interesting. 



3196. The pupil can train his eye in the attempt to distin- 

 guish the different kinds of maples by means of their fruits. The 

 fruits of two kinds are shown in the pictures ; and a raceme of 

 the forming fruits of negundo or box- elder f which is very closely 

 allied to the maples) is shown in Fig, 264. Is the inflorescence 

 of the negundo terminal or co-terminal (55) ? 



320, Another type of samara is that of the 

 hop-tree or shrub-trefoil (Fig. 265), a large bush 

 or very small tree, with trifoliolate leaves, which 

 is widely distributed over the country In this 

 case, the fruit is also 2-loculed, but it is winged 



