334 IOWA ACADEMY OF SCIENCE 



Artemisia tridentata Nutt. Sagebrush is abundant but not 

 evenly distributed, being often nearly absent in large 

 areas. It is mostly low and dwarfed, reaching its best 

 development on the low strip along the Columbia, and 

 elsewhere in depressions where the moisture conditions are 

 .a little better than common. 



'GiMJcplialium palustre Nutt. Common along the Umatilla. 



Gnaphalium chilense Spreng. Scarce, in moderately dry places. 



Carduus lanceolatiis L. Common in moist ground. 



Carduus undulatus Nutt. Found in rather dry ground in only 

 a few places. 



Willamette University, 

 .Salem, Oregon. 



