738 



WEED FLORA OF IOWA 



Fig. 556. Goldenrod (Solidago rigida). Common in Iowa. 

 (Photographed by Gardner.) 



Goldenrod (Solidago serotina) Italy (Arcangeli), Germany 

 (Garcke). 



Mexican tea (Chenopodium ambrosioides) Germany (Garcke, 

 Alpers), Italy (Arcangeli). 



Nightshade, buffalo bur (Solanum rostratum) Germany (Garcke, 

 Alpers). 



Nightshade, buffalo bur (Solatium heterodoxum) Germany 

 (Garcke). 



Nightshade, Three-flowered (Solanum triflorum) Germany 

 (Garcke, Alpers). 



Pellitory (Parietaria pennsijlvanica) Germany (Garcke). 



Peppergrass (Lepidium virginicum) Germany (Garcke), France 

 (Tourlet). 



Phacelia (Phacelia tanacetifolia) Germany (Garcke). 



Pigweed, Tumbleweed (Amaranthus graecizans) Italy (Arcan- 

 geli), Germany (Bitter). 



Pigweed (Amaranthus retroflexus) Italy (Arcangeli), Germany 

 (Garcke, Alpers), France (Acloque), Austria (Neilreich). 



