CONTEXTS 



Page 



I ntroduction 5 



Blue joint grass 7 



Nodding wild rye 7 



Hemp 9 



Common smartweed 9 



Swamp dock 13 



Maple-leaved goosefoot 13 



Ball mustard 15 



Indian mustard 15 



Tumbling mustard 19 



Canada milk vetch 21 



Indian mallow 21 



Water hemlock 21 



Common milkweed 23 



Hoary vervain 27 



Wood sage . • 27 



Dragonhead mint 27 



Wild bergamot 31 



Common plantain 31 



Bracted plantain 33 



Gumweed 33 



Beggar-tick 37 



Roadside thistle 37 



Black-eyed Susan 30 



Dandelion 39 



ILLUSTRATIONS 



Page 



Fig. 1. Minnesota weed seed case, scries 111 5 



Fig. 2. Blue joint grass 



Fig. 3. Nodding wild rye 8 



Fig. 4. Hemp 10 



Fig. 5. Common smartweed 11 



Fig. 6. Swamp dock 12 



Fig. 7. Maple-leaved goosefoot 14 



Fig. 8. Ball mustard 16 



Fig. 9. Indian mustard 17 



Fig. 10. Tumbling mustard 18 



Fig. 11. Canada milk vetch 20 



Fig i-\ Indian mallow 22 



Fig. 13- Water hemlock 24 



Fig. [4. ( lommon milkweed 25 



Fig. [5. Il'),u\ vervain 26 



Fig. 1'). Wood sage 28 



Fig. 17. Dragonhead mint 29 



1 x. Wild bergamot 30 



Fig. 10. ( 'ommon plantain 32 



Fig. 20. Bra< ted plantain 34 



Fig. 21. Gumweed 35 



Fig. 22. Beggar-tick 36 



Fig. 23. Roadside thistle 38 



Fig. 24. Black-eyed Susan 40 



Fig. 25. Dandelion 41 



