MIDDLESEX FLORA. 9 



CAMELINA, Crantz. 



C. sativa, Crantz. FALSE FLAX. 



Maiden (F. S. Collins) ; Westforcl, woollen-mill yard (Dr. C. W. 

 Swan) ; Medford (Wm. Boott). June-July. Adv. from Eu. 



CAPSELLA, Vent. 



C. BURSA-PASTORIS, Moench. SHEPHERD'S PURSE. 

 Everywhere. Apr.-Nov. Nat. from Eu. 



THLASPI, Tourn. 



T. arvense, L. MITHRIDATE MUSTARD. 



Somerville (C.E.Perkins); Lowell; Chelmsford, two localities, 

 one in a field which had been cultivated ; numerous plants in 

 another which had been dressed with wool-waste ; no evidence of 

 permanent residence (Dr. C. W. Swan). May. Adv. from Eu. 



LEPIDIUM, L. 



L. Virginicum, L. WILD PEPPERGRASS. 

 Common. June-Sept. 



L. RUDERALE, L. 



Lowell and Chelmsford (Dr. C. W. Swan) ; Somerville and Cam- 

 bridge (C. E. Perkins) ; Weston (F. S. Collins). Rather common 

 in the eastern section of the county. The rare form with petali- 

 f erous flowers has been found at Maiden. May-June. Nat. from Eu. 

 L. CAMPESTRE, R. Br. 



Newton (C. J. Sprague) ; Cambridge (T. W. Harris, Hovey's Mag. 

 Vol. VI, 1840) ; Maiden ; Melrose, not uncommon, 1884 and 1885, 

 (F. S. Collins) ; Lowell, on the road-bed of the B. & M. R. R. (Dr. 

 C. W. Swan). June. Nat. from Eu. 



SENEBIERA, DC. 

 S. didyma, Pers. 



Cambridge, in walks (L. H. Bailey, Jr.) "An immigrant from 

 farther south." Man. May-June. 



ISATIS, L. 



/. tinctoria, L. Wo AD. 



Newton (C. J. Sprague), fide specimen in herb. B. S. N. H. Adv. 

 from Eu. For description, see Wood's Bot. & Fl. 



CAKILE, Tourn. 



C. Americana, Nutt. SEA-ROCKET. 



Medford (C. E. Perkins); Maiden (F. S. Collins). . Along the 

 Mystic. July-Aug. 



