WEEDS. 251 



America ; two from Asia ; the remaining 48, natives 

 of the United States. 



In my opinion the following list comprises the 20 

 worst species of weeds growing in Indiana, and named 

 in the order of their injuriousness. Both common 

 and scientific names are given, together with the 

 original home of each species : 



1. Rag- weed, Ambrosia artemisiefolia L. United States. 



2. Foxtail, Setaria glaucu Beauv. Europe. 



3. Iron-weed, Vemonia fasciculata Michx. United States. 



4. Great Rag-weed, Ambrosia trifida L. United States. 



5. Pig-weed, Amarantm retroflexus L. Tropical America. 



6. Horse- weed, Erigeron canadense L. United States. 



7. Cocklebur, Xanthium canadense Mill. United States. 



8. White-top, Erigeron annuus L. United States. 



9. Lamb's-quarters, Chenopodium album L. Europe. 



10. Common Thistle, Cnieus lanceolatus Hoffm. Europe. 



11. Field Sorrel, Rumex acetosella L. Europe. 



12. Purslane, Poi-tulaca oteracea L. Europe. 



13. Bur-grass, Cenchrus tribuloides L. United States. 



14. Beggar's Ticks, Bidens frondosa L. United States. 



15. Prickly Lettuce, Lactuca seariola L. Europe. 



16. Crab-grass, Panicum sanguinale L. Europe. 



17. Jimson-weed, Datura stramonium L. Asia. 



18. Smart-weed, Polygonum persicaria L. Europe. 



19. Bracted Bindweed, Convolvulus sepium L. United States. 



20. Corn Cockle, Lychnis githago L. Europe. 



Of these it will be seen that nine are native ; nine 

 are from Europe; one from tropical America, and 

 one from Asia. The first, third and fourth are native, 

 so that all in all the American weeds have held their 

 own quite successfully in the Hoosier State. 



And now, we suppose, the question naturally arises : 

 "What is the best method of ridding ourselves of 

 these weeds now that they are here ? " In my opinion 



