794 WEED FLORA OF IOWA 



cleanings, etc., can be removed from any premises. Threshing ma- 

 chines must be thoroughly cleaned before being removed to another 

 place. 



WEED LEGISLATION. 



Various states have legislated in regard to certain weeds as 

 follows: Arizona on coekleburs and sunflowers; California on 

 Canada thistles and any and all weeds that are spread by the 

 wind; Connecticut on Canada thistle and wild carrot; Delaware, 

 Canada thistle; Illinois, Canada thistle on highways, coekleburs 

 and all weeds before maturity; Iowa, Canada thistle, cocklebur, 

 burdock, curled dock, smooth dock, wild parsnip, quack grass, vel- 

 vet weed, horse nettle, Russian thistle and shoo-fly ; Indiana, Can- 

 ada thistle ; Kansas, on highways, coekleburs. Rocky Mountain sand- 

 burs, burdocks, sunflower, and such other weeds as may be in- 

 jurious to the best interests of the farming community ; Kentucky, 

 Canada thistle; Maryland, Canada thistle; Michigan, to remove 

 noxious weeds on highways, Canada thistle, milkweed {Asclepias 

 syriaca) ; Minnesota, weeds in three groups: first group, wild mus- 

 tard, wild oats, cocklebur, burdock, tumble mustard, second group, 

 Canada thistle, ox-eye daisy and quack grass, third group, French 

 weed; a section prohibits the spread of weeds from empty freight 

 cars ; the following weeds must be destroyed on highways : Russian 

 thistle, Canada thistle or other thistles, burdock, ox-eye daisy, wild 

 mustard, snap dragon or toad flax, cocklebur, sow thistle, sour 

 dock, yellow dock and other noxious weeds; Missouri, Canada 

 thistle; Nebraska, Canada thistle; New Jersey, Canada thistle; 

 New Tork, Canada thistle and other noxious weeds along canals; 

 North Dakota, Canada thistle, cocklebur, mustard, wild oats, 

 French weed, Russian thistle; Ohio, brush briers, thistles or other 

 noxious weeds, Canada thistle, wild parsnip, sweet clover, wild 

 carrots, teasel, burdock, coekleburs; Oregon, dagger cocklebur, 

 Canada thistle; Pennsylvania, Canada thistle; South Dakota, 

 Russian thistle, Canada thistle, and cocklebur ; Vermont, all thistles 

 and noxious weeds ; Washington, Canada thistles ; in West Virginia, 

 the county court may offer reasonable bounties or rewards for birds 

 of prey or weeds; Wisconsin, Canada thistle, burdock, ox-eye 

 daisy, toad flax, cocklebur, sow thistle, sour dock, and yellow dock, 

 mustard, wild parsnip, sweet clover, and Russian thistle. 



Many states have passed supplementary legislation. Many other 

 countries besides those mentioned here have rather stringent laws 



