324 IOWA ACADEMY OF SCIENCE 



Sporobolus crypto nclrus (Torr.) Gray. Common in dry sandy 

 places near the Columbia and Umatilla. 



Sporobolus asperifolius (Nees and Mey.) Thurb. Found in 

 abundance in a moist, slightly alkaline depression along the 

 Umatilla. 



Agrostis alba L. Common along the Umatilla and in irrigated 

 ground. 



Agrostis exerata Trin. Occasional on the margin of the Uma- 

 tilla. 



Deschampsia calycina Presl. Abundant along the Umatilla. 



Deschampsia elongata (Hock.) Munro. Frequent along the Uma- 

 tilla. 



Eragrostis hypnoides (Gam.) B. S. P. Infrequent along the. 

 Umatilla. 



Poa annua L. Common in damp places. 



Poa compressa L. Common, with the preceding. 



Poa campestris L. Common, with the preceding. 



Distichlis spicata (L.) Greene. Found plentifully in severa\ 

 moist, more or less alkaline places. 



Festuca octoflora Walt. This is one of the very abundant spe- 

 cies over the dry elevated sections. It is very short lived 

 and dwarfed. 



Festuca megalura Nutt. Found sparingly in sandy ground near 

 the Columbia. 



Festuca elatior L. Found occasionally near the Umatilla and 

 along irrigating ditches. 



Bromus sp. An apparently native perennial in damp ground ; 

 scarce. 



Bromus tectorum L. The most plentiful grass, distributed in 

 enormous abundance over almost the entire area studied, 

 without regard to soil or moisture conditions. 



Agropyron smithii mollis (Scrib. and Sm.) Jones. In dry 

 ground ; scarce. 



Agropyron subvillosum (Hook.) Piper. In dry ground: infre- 

 quent. ' 



