Table of Contents 



PAGE 



What is a Weed, Kinds of Weeds, Annual, Winter Annual 5 



Biennial, Perennial, How Weeds Spread, Vegetative Propagration. . . 6 



Seed Propagation, Dissemination or Scattering of Plants 7 



Water, Animals 8 



Explosive Properties, Seeds Burying Themselves 9 



Man as an Agent, Impure Seeds 10 



Iowa Pure Seed Law 11 



Threshing Machines, Cultivation, Packing Material, Plants, Culti- 

 vated for Ornamental Purposes, Iowa Weed Law 16 



Other Weeds, Treatment of Weeds 20 



Perennial Weeds 21 



Quack Grass, The Cover Method, Canada Thistle and Horse Nettle. . .22 



Morning Glory and Milk Weed 23 



Indian Mallow 24 



Sweet Clover, Greater Ragweed or Kinghead, Cocklebur 25 



Weeds of Special Crops, Small Grain, Corn 26 



Garden Weeds, Meadows, Pastures, Roadsides, Poisonous Weeds 27 



Grass Family, Yellow Foxtail 30 



Green Foxtail, Quack Grass 31 



Drop Seed Grass, Squirreltail Grass 33 



Crab Grass, Sedge Family, Dock and Smartweed 34 



Curled Dock 35 



Pale Dock, Sheep Sorrel 36 



Goosefoot Family, Pigweed Family, Pink Family 37 



Purslane Family 38 



Crowfoot Family, Mustard Family 40 



Mallow Family 41 



Velvet Weed, Parsley Family 42 



Parsnip, Carrot 43 



Oowbane 44 



Morning Glory, Dodder 45 



Mint Family 47 



Nightshade, Horse Nettle 48 



Plantain, Buckhorn, Composite, Bull Thistle 49 



Canada Thistle, Cockle Bur, Ragweed 50 



Burdock 51 



Suggestions for the Teacher 52 



Questions and Topics 53 



Bibliography 55 



