WEED MIGRATION 



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Fig. 537. Caster Oil plant. Cultivated as an ornamental plant in Iowa, but a 



troublesome weed in South Africa. 



(After Faguet.) 



temulcntum), plantain (Plantago major), ribgrass (Plantago 

 lanceolata) , sheep sorrel (Bumex acetosella) , curled dock (Rumex 

 crispus), black nightshade (Solatium nigrum), dandelion (Taraxa- 

 cum officinale), cow-herb (Saponaria vaccaria), vetch (Vicia sa~ 

 tiva). III. Common; spiny amaranth (Amaranthus spinosus), 

 goosefoot (Chenopodium album), hemp (Cannabis indica), nut 

 grass (Cyperus esculentus), shoo-ny (Hibiscus trionum), lady's 

 sorrel (Oxalis corniculata) , purslane (Portulaca oleracea), castor- 

 oil bean (Bicinus communis), and caltrop (Tribulus terrestris). 

 IV. Abundant; (the most common species) purple amaranth 

 (Amaranthus paniadatus) , sticktight (Bidens pilosa), jimson weed 

 (Datura stramonium), purple thorn apple (Datura tatula), wire 



