666 



GEOGRAPHICAL DISTRIBUTION OF 



Ninety genera are represented by species in both hemispheres. 

 In comparing some of the genera of Europe with some of those, 

 of North America, we find that 



Europe has 40 species of A vena ; North America has 11 species. 

 " " 28 " " Festuca; " " " 4G 



" 12 '' " Kceleria; " *' " 1 " 



" <' 9 " " PMeum; " '' " 1 " 



North America has 171 species of Panicum ; Europe has 6 species. 



One species each of four small though conspicuous European 

 genera are cultivated in North America, viz. : Anthoxantlium ,, 

 Arrhenatherum, Dactylis, Lolmm. 



In comparing some of the genera of Australia with some of 

 those of North America, we find that Australia has no large genus 

 of grasses not represented in North America, though that country 

 has a few genera of medium size and many of a small size not rep- 

 resented in this country. 



North America has 76 Sp. of Mnhlenhergia ; Australia has Sp.. 



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