WEED MIGRATION 



735 



of our plantains is of common occurrence. There is no morning- 

 glory. 



It may be of interest to compare the noxious weeds of Ger- 

 many with those of the United States. Dr. A. Thaer of the Uni- 

 versity of Giessen in 1881 published a small book on the agricul- 

 tural weeds of that country listing the following: (Those printed 

 in small capitals are also weedy in Iowa.) Com poppy (Papaver 

 rhoeas), mustard (Beassica abvensis), charlock (Raphantjs 

 eaphanisteum), Canada thistle (Ciesium abvense), corn cockle 

 (Ageostemma githago), chickweed (Stellabia media), sheep sorrel 

 {Bumex acetosella), vetch {Yida Mrswta), colt's-foot {Tussilago 

 farfara), com chamomile (Anthemis arvensis), com marigold 



Fig. 555. Cypress Spurge (.Euphorbia cyparissias) . Common in Europe and 

 waste places in Iowa. In many oases started in the vicinity of cemeteries. 

 (After Strasburger, Noll, Schenek and Karsten.) 



{Chryscmthem-um segetum), groundsel {Senecio vernalis), corn- 

 flower {Centaurea cyanus), sow thistle (Sonohus oleeacetjs), 

 small bindweed (Convolvulus aevensis), clover dodder (Cuscuta 

 bpithymum), broom rape {Oroianohe ramosa), garden orach 



