7? WEST-AMERICAN , 



Old World and Australia, with four genera in the 

 United States, comprising ten species, nine of them in 

 Northwest America. The wood of all these trees is 

 more or lesfe fragrant and pungent; the leaves, small 

 and scale-like; the cones small, with scales valvate or 

 peltate. They are represented in America by two 

 pairs of closely-allied genera: 



First Pair, The Arbor-Vitae 



Spire-shaped trees, with cones oblong and scales flat, 

 convex, or thickened; branchlets with sprays of foli- 

 age flattened horizontally, and decurrent leaves of 

 two forms. Two genera: 



Eighth Genus, THUYA-Linn. 



TRUE ARBOR VrLffi. 



Fertile scales 6, unequal in size, thin; seeds 12. 

 Two species in America (called Cedars), one in the 

 Eastern States, the other in the Northwest. Heart- 

 wood reddish. 



No. i Pacific Red Cedar 



Tli. plicata, Lambert, 1803. 

 Th. giganlea, Nuttall. 



Noble trees, with headquarters of greatest devel- 

 opment around Puget Sound. Apt to taper rapidly 



