122 BOTANY OF MICHIGAN 



Artemisia biennis WiM. Biennial wormwood. As a weed in damp 

 ground about cities and villages and along railroads. An immigrant 

 from the west. Frequent. 



Artemisia absinthium L. Common wormwood. On roadsides and 

 about cities and villages as an escape from cultivation. 



Petasites palmatus (Ait.) Gray. Palmate-leaved sweet colt's-foot. 

 Damp open or shaded ground throughout. Frequent. W. T. S. Cornell. 



Erechtites hieracifolia (L.) Raf. Fire-weed. Moist open or shaded 

 ground. Often plentiful on burned over areas. 



Senccio aureus L. Golden ragwort. In damp mostly shaded places 

 throughout . Plentiful . 



Senecio balsamitae Muhl. (S. pauperculus Michx.). Balsam ground- 

 sel. In dry open or partially shaded ground and along sandy beaches. 

 Frequent. 



Arctium, minus Bernh. Common burdock. Waste places, roadsides, 

 fields and open woods. Frequent. 



Cirsium lanceolatum (L.) Hill. Common thistle. Roadsides, pastures 

 and fields. Frequent. 



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

 Lake Michigan and Lake Superior. Frequent. Seldom abundant. 



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

 ground throughout. Frequent. 



Cirsium muticum Michx. Swamp thistle. In swampy places and 

 damp woods. Frequent. 



Cirsium. arvense (L.) Scop. Canada thistle. Roadsides, pastures and 

 cultivated grounds. Becoming common. 



Cichorium intybus L. Chicory. Occasional about cities and villages 

 and in cultivated grounds. Frequent. 



Tragopogon porrifolius L. Oyster plant. Escaping from cultivation 

 to roadsides and along railroads. Frequent. 



Tragopogon pratensis L. Yellow goat's-beard. Waste places in cities 

 and villages, Often plentiful. 



Taraxacum officinale Weber. (Leontodon taraxacum L.). Common 

 dandelion. Common everywhere. Abundant in fields and pastures. 



Sonchus arvensis L. Corn sow-thistle. Along railroads, in depot 

 grounds of cities and villages and becoming a weed on roadsides and in 

 fields. Frequent. 



Sonchus oleraceus L. Common sow-thistle. A weed in waste places, 

 gardens and fields. Plentiful. 



Sonchus asper (L.) Hill. Spiny-leaved sow-thistle. A weed in waste 

 places, gardens and fields. Frequent. 



Lactuca scariola integrata Gren. & Godr. Prickly lettuce. A weed in 

 waste grounds of cities and villages and becoming frequent. 



