THE BARBERRY IN IOWA 



225 



pasture aiul near it were red cedars (Junipcrus virgi)iiaiia). llie 

 black walnuts had evidently been planted there many years ago. 

 Other trees noted in the pasture were bur oak (Qitcrcus macrocar- 

 pa), American elm (UIiiiiis Americana) , slippery elm (U. fulva), 

 red haw, white ash, black cherry, and across the road were basswood 

 (Tilia Americana), swamp white oak (Quercus platanoidcs), and 



Fig. 75. — Old (escaped) Barberry roots, Montpelier. 

 Colburn, 1918. 



Photographed by F. E. 



honey locust (Glcditsia triacanflws). Of the shrubs I observed the 



^Missouri gooseberry (Ribcs gracile), wild grape (Vitis vulpina), 



sumach (Rhus glabra), dogwood (Cornus asperifolia), blackberry 



(Rhiibiis nigrobaccus) and black currant (Ribes floridnm). The 



herbaceous plants observed were sweet William (Phlox divaricata), 



blue grass (Poa pratensis), P. compressa, timothy, Phleum pratense. 



The timothy was common near the barberry bushes. ' On every one of the 

 clumps of wild barberry secial infection was observed on May 19, 1919, but 

 there were no cups. It would appear that the infection might have come 

 from timothy. The writer observed in Muscatine and Louisa counties 

 Hordeum pusilluvi, Bromus tectorum, Secale cereale heading out. Winter 

 wheat and squirrel tail grass also were observed, but in no case did the 

 writer observe uredo stage on these grasses. In this connection attention 

 may be called to stations established in Manchester in the fall of 1918 con- 

 taining an abundant infection of Puccinia graminis on Hordeum jubatum. 

 Agrostis alba, Agropyron repens, Phleum pratense and Dactylis glomerata 

 and rye. In no case did the writer find any indication of P. graminis on 



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