34 
Sisymbrium arvense. 
Found by Rev. J. L. Russell, with other weeds, persisting for many 
years, in Salem. (Adv. from Europe.) 
Brassica alba. (WHITE MusTarRD.) * 
Found on the South Boston *‘ dump” (C. E. Faxon); also reported 
as growing in Andover (Mrs. Downs). (Introduced from Europe.) 
Brassica nigra. (BLack MustTarD.) 
In various parts of the county. (Adv. from Europe.) 
Brassica campestris, Z. (CABBAGE, ETC.) 
Var. Colsa. (RaPE.) 
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, LZ. (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; ifa locality, the extent of which 
is hardly more than ten feet in diameter, can be considered as en- 
titled to that term. 
Alyssum maritimum, LZ. (Swrrer ALyssum.) 
Common in gardens often escaping in yards and streets. (Nat. 
from Eu.) 
Camelina sativa, Crantz. (FALSE FLax.) 
On Derby Wharf, Salem, 1877. Introduced by the colonists con- 
tinuing a weed, observed (probably 1824) ‘‘at Salem” (Dr. Chas. 
Pickering, Chron. Hist. Pl. p. 853); Boxford (Miss Perley). 
Capsella Bursa-pastoris, Mench. (SHEPHERD’S PURSE.) 
A most common weed. In flower from May to November. (Nat. 
from Eu.) 
Thalaspi arvense, LZ. (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 Virginicum, Z. (WILD PEPPERGRASS.) 
Common in fields and along roadsides. 
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