WEEDS OF MONTANA. 



67 



SUBJECT INDEX. 



Figures Refer to Paires. 



Adaptations cf weeds. 5, 6, 9. 

 Alluvial weeds, 9. 



Animal transportation of seeds, 8, 9. 

 Annuals, 6, 7, 12. 13. 

 Biennials, 7. 12, 13. 

 Burs, 8. 



Characteristics of weeds, 5, 11. 

 Classification by situation, 13—17. 

 Crop-rotation. 17. 

 Cultivated ground, weeds of. 15. 

 Dissemination; Distribution, 7. 

 Eastward extension of weeds, 12. 

 Eradication, 17—22. 

 Fire weeds, ( .t. 

 Fleshy habit, 6. 

 Foreign origin of weeds. 12. 

 Gardens, weeds of, 5, 9, 15. 

 Grain fields, weeds of, 5, 9, 16, 17. 

 Head, 24. 

 Impure seed, 8, 9. 

 Indigenous weeds, 10, 11. 

 Introduced weeds, 10, 11. 

 Introduction, 3. 



Irrigation in weed dissemination, 7, 9. 

 Lawns, weeds of, 5, 9, 15. 

 Legislation needed, 21, 22. 

 List of the weeds of Montana, 24— fit). 

 Man as agent in weed dissemination, 

 9, 10. 



Meadows, weeds of, 5, 6, 15. 



Mud in weed dessemination, 14. 



Native weeds, see "Indigenous weeds." 



Origin of the weed flora, 9—13. 



Panicle, 24. 



Pasturage, 18. 



Pastures, weeds of, 5, G, 15. 



Perennials, 12, 13. 



Railways in weed dissemination, 8. 



Reproduction. P>. 



Root-system, 13. 



Rules for recognition of introduced 



weeds, 11. 

 Seeds of weeds in food, 5. 

 Special methods of eradication, 18—2 . 

 Spike, 24. 

 Subindigenes, 11. 

 Summer fallow, 18, 21. 

 Tumble-weeds, 7. 

 Vitality of weed seeds, 6, 21. 

 Waste places, weeds of, 5, 13, 14. 15. 

 Water in weed dissemination. 7. 9. 

 Waysides, weeds of. 5, 6, 13, 14, 15. 

 Weed Mora, origin of. 9, 12. 

 Weed law, 22, 23. 

 Westward extension of weeds, 12. 

 Wind in weed dissemination, 7, 9. 

 Wool industry, relation of weeds to, 8. 

 Yards, weeds of, 5, 13, 14, 15, 



GENERIC INDEX OF SCIENTIFIC NAMES. 



Achillea, 12, 15. 25. 

 Agrostemma, 25. 



Allionia. 12, 25. 



Amaraiuhus.7,11,12, 13,14, 15,25,26,60. 



Ambrosia, 13. 14, 26, 27. 



Anthemis, 14. 27, 4s. 

 Arctium, 14. 27. 

 Arenaria, 14, 28, 

 Artemisia. 12, 14, 16,28. 

 Atriplex, 14, 28. 



