34 



Sisjmibrium arvense. 

 Found by Eev. J. L. Russell, with other weeds, persisting for many 

 years, In Salem. (Adv. from Europe.) 



Brassica alba. (Whitb Mustard.) 



Found on the South Boston " dump " (C. E. Faxon) ; also reported 



as growing in Andover (Mrs. Downs). (Introduced from Europe.) 

 Brassica nigra. (Black Mustard.) 



In various parts of the county. (Adv. from Europe.) 

 Brassica campestris, ^. (Cabbage, etc.) 

 Var. Colsa. (Kapk.) 



Found in a street In Salem. 

 Var. 



A tall smooth form found in cultivated fields in Danvers (J. H. 



Sears). (Introduced.) 



Draba Caroliniana, Walt. 

 Salem 1824 (Dr. Chas. Pickering). The original locality still exists, 

 the plants being more or less abundant each year, usually appearing 

 in April. 



Draba verna, L. (Whitlow Grass.) 

 Danvers 1826 (Dr. Andrew Nichols). This species is only found at 

 the old locality, and some seasons but two or three plants are to be 

 seen, yet it has retained its place in our flora, now and then ap- 

 pearing in comparative abundance ; if a locality, the extent of which 

 is hardly more than ten feet in diameter, can be considered as en- 

 titled to that term. 



Alyssum maritimiun, L. (Swbbt Alyssum.) 

 Common in gardens often escaping in yards and streets. (Nat. 

 from Eu.) 



Camelina satlva, Orantz. (False Flax.) 

 On Derby Wharf, Salem, 1877. Introduced by the colonists con- 

 tinning a weed, observed (probably 1824) "at Salem" (Dr. Chas. 

 Pickering, Chron. Hist. PI. p. 353) ; Boxford (Miss Perley). 



Capsella Bursa-pastoris, Maench. (Shepherd's Purse.) 

 A most common weed. In flower from May to November. (Nat. 

 from Eu.) 



Thalaspi arvense, L. (Field Pennycress.) 

 North Salem, 1858 (Geo. P. Bradford, Proc. E. I., Vol. II, p. 237) ; 

 " Yard of Plummer Hall, 1859 " (memo. Rev. J. L. Russell). (Nat. 

 from Eu.) 



Lepidium Virginietun, L. (Wild Peppbrgrass.) 

 ' Common in fields and along roadsides. 



