A FLORA IN NORTHERN OREGON 325 



Horde um murinum L. Frequent on moist banks of the Uma- 

 tilla. 

 Hordeum jubatum L. Frequent along the Umatilla. 



Hordeum nodosum L. Scarce, in moist ground near the Uma- 

 tilla, 



Etymus condensatus Presl. Frequent in small patches in moist 

 places along the Umatilla, but seldom covering more than 

 a very limited area. 



Elymus sp., possibly arenarius. Infrequent, in loose sand. 



Etymus flavescens Scribn. and Sm. A curious grass, the downy 

 yellow spikes very conspicuous ; growing rather scantily on 

 drifting sand. 



Sitanion sp. Frequent in very dry ground. A form remarkable 

 for its dense, soft pubescence. 



Cy perns in flex us Muhl. Common in wet places along the Uma- 

 tilla. 

 Cyperus escidentus L. In moist ground; scarce. 



Scirpus occidentalis (Wats.) Chase. Scarce, along the Uma- 

 tilla. 



Scirpus amcricanus Pers. Very abundant on wet margins of the 

 Umatilla. 



Hemicarpha micrantha (Vahl.) Britt. One specimen, in wet 

 ground along the Umatilla. 



Eleocharis palustris (L.) E, and S. Very abundant along the 

 margins of the Umatilla. 



Eleocharis obtusa Schult. One specimen, near the Umatilla. 



Eleocharis acicularis (G.) R. and S. Common along the Uma- 

 tilla. 



Car ex douglasii Boott. A few plants in slightly moist ground 

 near the Columbia. 



Carer praegracUis Boott, Found plentifully in one place among 

 cat tails along the Umatilla. 



Carex athrostachya Oln. Frequent along the Umatilla. 



Lemna minor L. Very common along the Umatilla. 



Juncus balticus Willd. Plentiful in slightly moist ground along 

 the Columbia and less so near the Umatilla. 



