MIDDLESEX FLOEA. 9 



Camelina, Crantz. 

 C. sativa, Crantz. False Flax. 

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

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



Capsella, Vent. 



C. BuESA-PASTORis, Moench. Shepherd's Purse. 

 Everywhere. Apr.-STov. Nat. from Eu. 



Thlaspi, Tourn. 



T. aj-vense, 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. fromEu. 



Lepidium, L. 



L. Virginicum, L. Wild Peppergbass. 

 Common. June-Sept. 



L. RUDERALE, L. 



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

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

 in the eastern section of the comity. 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. ColUns) ; Lowell, on the road-bed of the B. & M. E. E. (Dr. 

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



Senebiera, DC. 



iS. didyma, Pers. 



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

 farther south." Man. May-June. 



ISATIS, L. 



/. tinctoria, L. Woad. 

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

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



Cakile, Tourn. 



•C. Americana, Nutt. Sea-Eocket. 



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

 Mystic. July-Aug. 



