SHORE OF LAKE HURON 73 



Cirsium lanceolatum (L.) Hill. Common thistle. Roadsides and in 

 cultivated grounds. Not abundant or prominent anywhere. 



Cirsium pitcheri (Torr.) T. & G. Pitcher's thistle. On sandy beach 

 of Lake Huron from Arenac County to St. Ignace and on Mackinac 

 Island. Plentiful. 



Cirsium discolor (Muhl.) Spreng. Field thistle. In dryish open or 

 shaded ground. Occasional throughout. 



Cirsium muticum Michx. Swamp thistle. In swampy open or slightly 

 shaded ground throughout. Frequent. 



Cirsium arvense (L.) Scop. Canada thistle. Common in Bay County. 

 Occasional from Arenac County to Alcona County. Abundant from 

 Alpena to Mackinaw City and on Mackinac Island. 



Lapsana communis L. Nipple-wort. Mostly in shaded ground on 

 Mackinac Island. Abundant in spots. Not noticed elsewhere. 



Cichorium intybus L. Common chickory. Along roadsides and in 

 cultivated grounds, but seldom plentiful. Noticed throughout. 



Kriaia virginica (L.) Willd. Carolina dwarf dandelion. In sandy open 

 or slightly shaded ground in Arenac and Iosco counties, and noticed as 

 far as Alpena. Often abundant. 



Tragopogon porrifolius L. Salsify. In cities and villages and along 

 railroads throughout. Frequent. 



Tragopogon pratensis L. Goat's beard. In cities and villages and 

 along railroads. Seldom plentiful. 



Taraxacum officinale Weber. Common dandelion. Abundant in 

 Bay County. Infrequent in Arenac and Iosco counties. More abuni lant 

 from Alcona Comity to St. Ignace and on Mackinac Island. 



Sonchus arvensis L. Field sow thistle. In cities and villages especially 

 depot grounds. Frequent. Occasional in cultivated fields. 



Sonchus oleraceus L. Common sow thistle. Gardens and in waste 

 places of cities and villages throughout. Seldom plentiful. 



Sonchus asper (L.) Hill. Spiny-leaved sow thistle. About cities and 

 villages. Not noticed in uncultivated grounds. 



Lactuca scariola integrata Gren. & Godr. Prickly lettuce. Through- 

 out but apparently scarce. 



Lactuca canadensis L. Wild lettuce. In open or partially shaded 

 ground. Frequent throughout. 



Lactuca spicata (Lam.)'Hitchc. Tall blue lettuce. In rich open or 

 partially shaded ground. Frequent throughout. 



Prenanihes racemosa Michx. Glaucous white lettuce. Damp open 

 prairie-like ground near Cheboygan and St. Ignace. Apparently in- 

 frequent. 



Prenanihes alba L. White lettuce. Noticed in rich open or shaded 

 ground from Bay County to St. Ignace and Mackinac Island, Mackinac 

 County. Frequent throughout. 



