164 BOTANY OF MICHIGAN 



Artemisia biennis Willd. Biennial wormwood. Along roads and in 

 villages as a weed. Not common. 



Artemisia absinthium L. Common wormwood. Occasional through- 

 out. Abundant at Gatesville covering large areas of ground. 



Petasites palmatatus (Ait.) Gray. Palmate-leaf sweet coltsfoot. Wet 

 open or shaded ground throughout. Frequent. 



Senecio aureus L. Golden ragwort. Wet open or shaded ground 

 throughout. Often abundant. 



Senecio balsamitae Muhl. Balsam groundsel. Dry open ground 

 throughout. Not common. 



Cirsium lanceolatum (L.) Hill. Common thistle. Occasional through- 

 out, as a weed. 



Cirsium pitcheri (Torr.) T. & G. Pitcher's thistle. Sandy beach of 

 Lake Superior, but not abundant. 



Cirsium discolor (Muhl.) Spreng. Field thistle. Rich open or slightly 

 shaded ground throughout. Frequent. 



Cirsium muticum Michx. Swamp thistle. Wet swampy places 

 throughout. Frequent. 



Cirsium arvense (L.) Scop. Canada thistle. Gradually spreading as 

 a weed in cultivated grounds. 



Taraxacum officinale Weber. Dandelion. Throughout but nowhere 

 noticed as abundant. 



Sonchus oleraceus L. Common saw thistle. As a weed in cultivated 

 grounds, but not common. 



Sonchus asper (L.) Hill. Spiny-leaved saw thistle. A weed in culti- 

 vated grounds. Infrequent. 



Lactuca scariola inter grata Gren. & Godr. Entire-leaved prickly let- 

 tuce. A weed in cultivated grounds, but infrequent. 



Lactuca canadensis L. Wild lettuce. Rich damp open or slightly 

 shaded ground throughout. Frequent. 



Lactuca spicata (Lam.) Hitchc. Tall blue lettuce. Low open or 

 slightly shaded ground throughout. Common. 



Hieracium venosum L. Rattlesnake weed. Dry open or slightly 

 shaded places throughout. Frequent. 



Hieracium scabrum Michx. Rough hawkweed. Dry open or slightly 

 shaded ground throughout. Common. 



Hieracium canadense Michx. Canada hawkweed. Dry open or 

 slightly shaded ground throughout. 



