The Trees of Wyoming. 163 



closely related to the others. It is fairly plentiful through- 

 out the entire eastern part of the* state along the streams. 

 Its habit is always tree-like but it rarely attains a great 

 size 25 to 40 feet in height and a foot in diameter being 

 probably the maximum. It is hardy and may be readily 

 transplanted though in higher portions of the state it 

 makes slow growth and may need some protection. Its 

 fruits, its leaves and the slender, drooping clusters of 

 greenish flowers make it easily recognizable. 



Olive Family. 



This family contains about a score of genera only a 

 few of which belong to North America. Of these the 

 common Lilac (Syringa} and the Ash {Frojriums) are the 

 best known. Since the members of this family differ 

 greatly among themselves, our species only need be con- 

 sidered. 



11. ASH. 



(Frojnmms.) 



Of the dozen or more species in the United States, 

 one (possibly two) occurs in Wyoming. All are trees 

 and some of them attain a great size, furnishing timber of 

 much value. They are easily known by the compound 

 leaves and the winged fruits as shown in the figure below. 

 The fruits are borne in clusters and do not differ mater- 

 ially except in the relative size of the wing and the body 

 of the seed. 



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