740 WEED FLORA OP IOWA 



Pigweed, winged (Cycloloma platyphyllum) Italy (Arcangeli). 



Plantain (Plantago aristata) Germany (Bitter). 



Ragweed, small (Ambrosia artemisiifolia) Germany (Garcke, 

 Laubert). 



Rice cut-grass (Lcersia oryzoides) Italy (Arcangeli), Germany 

 (Garcke, Buchenau), France (Acloque), Austria (Neilreich), 

 England (Hooker). 



Sida (Sida spinosa) Germany (Alpers). 



Spanish needle (Bidens bipinnata) Italy (Arcangeli), Germany 

 (Garcke, Boute), France (Acloque). 



Spanish needle (Bidens frondosa) Italy (Arcangeli). 



Spanish needle (Bidens leucanthus) Germany (Garcke). 



Speargrass (Eragrostis pilosa) Italy (Arcangeli), Germany 

 (Garcke), France (Acloque). 



Speedwell (Veronica percgrina) Italy (Arcangeli), Austria 

 (Neilreich). 



Sunflower, artichoke (HcliantJius tuberosus) Italy (Arcangeli), 

 Germany (Garcke). 



Sunflower, common (Helianthus awnuus) Germany (Garcke), 

 Austria (Neilreich). 



Tickle grass (Panicum capillare) Germany (Alpers, Garcke), 

 France, Italy (Arcangeli), Austria (Neilreich). 



Tickseed (Coreopsis tinctoria) Germany (Bitter). 



Waterweed (Elodea canadensis) Germany (Garcke, Scherer, 

 Weshoff, Bitter), England (Hooker), France (Acloque). 



INDIGENOUS WEEDS COMMON TO THE NORTHERN HEMISPHERE. 



In all probability a few of the weeds here listed have been intro- 

 duced, at any rate their origin is in doubt; some occur in Europe 

 and North America only; those found in Asia are marked (As.). 



Achillea millefolium (yarrow) (As.). 



Alopecurus geniculatus (marsh foxtail). 



Anagallis arvensis (pimpernel) (As.). 



Anaphalis margaritacea (everlasting). 



Atriplex patula var. hastata (orach). 



Barbarea vulgaris (yellow rocket). 



Bidens cernua (sticktight). 



Capsella bursa-pasloris (shepherd's purse). 



Cerastium arvense (mouse-ear chickweed). 



Convolvulus sepium (morning-glory) (As.). 



