742 



WEED FLORA OF IOWA 



Plamtago major (common plantain) (As.). 

 Polygonum aviculare (dooryard knotweed) 

 Polygonum, hydropiper (smartweed). 

 Polygonum lapathifolium (smartweed). 

 Potentilla amserma (silvery cinquefoil). 

 Potentilla m^onspeliensis (five-finger) (As.). 



(As.). 



Fig. 559. 



Holy or Vanilla Grass (.Hierochloe borealis). Common In the nortliern 

 hemisphere, mountain regions. In northern Iowa. 

 (Lamson-Scribner, U. S. Dept. Agr.) 



Prunella vulgaris (self-heal). 

 Radicula palustris (marsh cress) (As.). 

 Banu/nculus cymbalaria (crowfoot). 

 Ranuncjdus pennsylvanicus (crowfoot) (As.). 

 Ranunculus repens (crowfoot). 

 Bhinanthus crista-galli (yellow rattle"). 



