100 FLORA OF WORCESTER COUNTY. 



Tussilago (Tourn.) L. Coltsfoot. 

 Farfara L. 

 Fitchburg. Mr. E. A. Hartwell. 



Erechtites Raf. Fireweed. 



hieracifolia (L.) Raf. In burned clearings. 



Senecio (Tourn.) L. Squaw-weed, 

 aureus L. Golden Ragwort. 



In swamps and wet meadows. 



Arctium L. Burdock. 



minus (Hill.) Bernh. Common Burdock. 



In waste places, common. 



Carduus (Tourn.) L. Plumeless Thistle, 

 crispus L. 



Worcester. Mr. L. White. 



Oirsium (Tourn.) Hill. Common Thistle. 



lanceolatum (L.) Hill. Common Thistle. 



In fields and waste places, common. 

 spinosissimum (Walt.) Scop. Yellow Thistle. 



Southbridge. Mr. L. E. Ammidown. 

 discolor Spreng. In fields and along roadsides. 



muticum Michx. Swamp Thistle. In swamps. 



pumilum (Nutt.) Spreng. Pasture Thistle. 



Southbridge. Mr. L. E. Ammidown. 

 arvense (L.) Scop. Canada Thistle. 



In fields and waste places, common. 



Oentaurea L. Star Thistle, 

 nigra L. Knapweed. 



Hardwick. Mr. R. M. Harper, 

 maculosa Lam. 

 West Auburn, recently introduced. 



