i IX. j 



51 



198. Sagittate, (from sagitta, an arrow,) or arrow shaped 

 leaf; this is represented at a. Fig. 30; the Sagittaria, or Ar- 

 row-head, an aquatic plant, affords an example of this leaf. 



199. Acerose, or needle shaped ; this is represented at 6, Fig, 

 30. Leaves of this kind are mostly clustered together, as in 

 the pine ; they are subulate, or pointed like a shoemaker's awl ; 

 they are rigid, or stiff, and evergreen. 



200. Trees with acerose leaves, are usually natives of moun- 

 tainous or northern regions ; any other kind of leaves would in 

 these situations be overpowered by the weight of snow or the 

 violence of the tempests; but these admit the snow and wind 

 through their interstices ; their many points or edges, presented 

 even to a gentle breeze, produce a deep, solemn murmur in the 

 forest ; and when the storm is abroad, and the tempest high, 



" The loud wind through the forest wakes, 

 With sound like ocean's roaring, wild and deep, 

 And in yon gloomy pines strange music makes." 



198. What is a sagittate leaf 1 



199. What is an acerose leaf? 



200. What is observed of trees with acerose leaves 1 



