480 . ANNUAL REPORT 



Taraxacum officinale Web. Dandelion. 

 Common everywhere, along roadsides, in pastures, etc. 

 Sonchus aleraceus, L. Common Sow Thistle. 

 Common in gardens and about dwellings. 



ASCLEPIADEAE. 



Asclepias cornuti, Decaisne, Common Milkweed or Silkweed. 



Common in this section and often troublesome. A most perni- 

 cious weed in The Traverse Bay region, Michigan, and according 

 to Prof. Beal (3) in many other portions of Michigan, especially 

 in light soil. It is more commonly found in rich, rather loose, 

 black sandy soil. It strikes root very deeply, and is difficult to 

 exterminate on that account. 



Asclepias tuberosa, L. Butterfly- weed. 



Common on sandy soil and occasionally "weedy." 



BORAGINEAE. 



Cynoglossum officinale, L. Hound's Tongue. 



Common along roadsides. La Crescent, Minn., and in dry 

 pastures. 



Echniosxjerinum lappula, Lehm. Stickseed. 



In gravelly soil, along roadsides, common. A troublesome 

 weed in Southern Eussia (Koppen), the burs fastening them- 

 selves to the fleece of sheep. 



Echinospernium virginianum, DC. Beggar's Lice. 



In woods, and borders of woods and along fences. 



CONVOLVULACEAE. 



Convolvulus sepium, L, Common Morning-glory. 



The weed is troublesome in grain and corn fields, using the 

 growing grain as a support, often pulling it to the ground. The 

 weed is one of the most difficult to exterminate. 



SOLANACEAE. 



Solanum migrum, L. Common Nightshade. 

 In shady and waste ground, common. 



Datura stramonium, L. Jamestown Weed. Locally it is known 

 as Jimson weed, a corruption of Jamestown. 



