The Trees of Wyoming. 101 



is, however, quite abundant among the hills in the lowest 

 portions of Crook County. In such situations it is usually 

 much reduced in size, but here in some places it is not 

 only well represented but many specimens becofne fine 

 trees 2 to 3 feet in diameter. It is one of the valuable 

 timber trees of that countv. 



Maple Family. 



(AceracecE) 



The Maple Family has three representatives, all of 

 them small, the Box Elder being the largest of the three. 

 The Silver, or Soft, Maple, so largely used as a shade 

 tree in the states lying to the east of this, does not occur 

 here and will not endure the climate of many parts of this 

 state. The species that do occur are all much hardier, 

 but are shrubby in habit and less well adapted for 

 transplanting. 



10. MAPLE. 



(Acer} 



This is the only genus in this family in North Amer- 

 ica. All its members are trees or shrubs with watery or 

 sweetish sap, the seed-like fruit in pairs and conspicuously 

 winged. Our species are as follows: 



(1) DWARF MAPLE. 



(Acer glabntm Torr.) 



Description. Leaves I to 2 inches long, smooth or 

 nearly so on both sides, lobed, the lobes acute and sharp- 

 ly toothed: the winged seeds about I inch long. 



This species is common in the foot- 

 hills and the more broken areas of the 

 state. It prefers canons and canon sides 



