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Triodm has been restored; and while the species embraced in this 

 genus are variable in habit and in floral character, the author does not 

 deem it practicable to segregate any of them into distinct genera. 



Ajra has been restored and Deschampsia relegated to synonomy un- 

 der it. 



Aspris is used for three annual economically unimportant species 

 heretofore carried under Aira. 



Agrostis palnstris is the name given for A. alba — cultivated redtop. 

 Agrostis capillaris replaces what has been considered a variety of 

 cultivated redtop — A. alba vulgaris. 



The synonomy is complete for generic names based on American 

 species. 



The lifelike sketches of representative species by Mrs. Gill and the 

 detailed taxonomic drawings by Assistant Agrostologist, Mrs. Agnes 

 Chase, practically all of which are new, are exceedingly helpful in the 

 recognition of the species typifying each genus. 

 \ Arthur W. Sampson. 



