738 



WEED FLORA OF IOWA 



Fig. 556. Goldenrod iSolidago rigida). Common In Iowa. 

 (Photographed by Gardner.) 



Goldenrod (SoUdago serotina) Italy (Arcangeli), Germany 

 (Gareke). 



Mexican tea {Chenopodium ambrosioides) Germany (Gareke, 

 Alpers), Italy (Arcangeli).' 



Nightshade, buffalo bur {Solanum rostratum) Germany (Gareke, 

 Alpers) . 



Nightshade, buffalo bur {Solanum heterodoxum) Germany 

 (Gareke). 



Nightshade, Three-flowered {Solanum triflorum) Germany 

 (Gareke, Alpers). 



Pellitory {Parietaria pennsylvanica) Germany (Gareke). 



Peppergrass {Lepidium virginicuni) Germany (Gareke), France 

 (Tourlet). 



Phacelia, (P^aceZia tanacetifolia) Germany (Gareke). 



Pigweed, Tumbleweed {Amaranthus graecizans) Italy (Arcan- 

 geli), Germany (Bitter). 



Pigweed {Amaranthus retroflexus) Italy (Arcangeli), Germany 

 (Gareke, Alpers), France (Aeloque), Austria (Neilreich). 



