Centaurea nigra, L. (Knapweed.) 

 "OQe specimen on railroad roadbed Swampscott" (Tracy); Dan- 

 vers (Oakes) ; "Dark Lane, Salem" (memo. G. D. Phippen), now 

 extinct ; Marblehead (G. D. Phippen) ; Topsfleld. Not very com- 

 mon except in the last named locality. (Adv. from Eu.) 



Cirsium lanceolatum. Scop. , (Common Thistle.) 



Common. Koadsides, etc. (Nat. from Eu.) 

 Cirsium discolor, Spreng. 



"Bare in Lynn" (Tracy); near Salem or Wenham, 1824 (Dr. Chas. 



Pickering) ; Danvers, etc. Not a very common species. 

 Cirsium muticum, Miehx. (Swamp Thistle.) 



Wenham swamp, 1824-6 (Dr. Chas. Pickering) ; Danvers, Methuen, 



Amesbury, etc. Frequent in low grounds. 

 Cirsium pumilum, Spreng. (Pasture Thistle.) 



Fields, etc. Common. A fragrant and handsome flower. 

 Cirsium horridulum, Michx. (Yellow Thistle.) 



Cape Ann and about Salem, 1824 (Dr. Chas. Pickering) ;• Manchester 



(G. D. Phippen) ; Pigeon Cove; Plum Island. Eather scarce. 

 Cirsium arvense, Scop. (Canada Thistle.) 



A very troublesome weed. (Nat. from Eu.) 



Onopordon acanthium, L. (Cotton Thistle.) 

 Little Nahant, Lynn, Salem Neck. Generally near the shore but 

 seen in Boxford, perhaps introduced with rock-weed manure from 

 some beach. (Adv. from Eu.) 



Lappa officinalis, AlUoni. (Burdock.) 

 Common everywhere. (Nat. from Eu.) 



Lampsana communis, L. (Nipple-wort.) 

 Salem, 1857 (Rev. J. L. Russell); Norman St., Salem, 1877 (J. R.). 

 Rare. (Adv. from Eu.) 



Cichorium Intytaus, L. (Ciohory.) 

 "Fields in Cambridge," 1783 (Dr. Manasseh Cutler in Mem. Am. 

 Acad., Vol. I). This would seem to indicate that at this time it had 

 not reached Essex Co. Bigelow (1814) speaks of it as " everywhere 

 in the vicinity of Boston." Very abundant on the roadbed of the 

 Eastern railroad at Somerville and Lynn; Salem near March St., 

 etc. ; Gloucester (Mrs. Babson) ; Ipswich, Newburyport. Increas- 

 ing. (Nat. from Eu.) 



Krigia Virginica, Willd. (Dwakf Dandelion.) 

 Common on dry hills. Flowers a beautiful orange color, heads small. 



