110 MIDDLESEX FLOKA. 



J. articulatus, L. 



Groton and Lowell (Dr. C. W.Swan) ; Medford (Wm. Boott). 

 J. militaris, Bigel. BAYONET RUSH. 



Tewksbury (B. D. Greene); Dracut and Westford (Dr. C. W. 



Swan) ; Concord (Walter Deane) ; Bedford (C. W. Jenks). 

 J. acuminatus, Michx., var. debilis, Engelm. 



" Issue of Mystic river" (Wm. Boott; specimen in herb. of). 

 J. acuminatus, Michx., var. legitimus, Engelrn. 



Lowell (Dr. C. W. Swan) ; Medford and Somerville (C. E. Perkins) . 

 J. nodosus, L. 



Medford (Wm. Boott; specimen in herb. of). 

 J. scirpoides, Lam. 



Medford (Wm. Boott; specimen in herb. of). 

 J. scirpoides, Lam., var. polycephalus, Engelm. 



Tewksbury (B. D. Greene), specimen in herb. B. S. N. H. Un- 

 doubtedly adv. from farther South. 

 J. Canadensis, J. Gay, var. longicaudatus, Engelm. 



Generally distributed. 

 J. Canadensis, J. Gay, var. coarctatus, Engelm. 



Billerica and Marlboro (Dr. C. W. Swan); Somerville (C. E. 



Perkins). 



PONTEDERIACE^E. PICKEREL-WEED FAMILY. 



PONTEDERIA, L. 



P. cordata, L. PICKEREL-WEED. 

 Common. 



COMMELYNACEyE. SPIDERWORT FAMILY. 



TRADESCANTIA, L. SPIDERWORT. 



T. Virginica, L. 



Ashland (F. S. Collins), growing along the track of the B. & A. 

 R. R., remote from houses. Adv. from farther South. 



XYRIDACE>. YELLOW-EYED-GRASS FAMILY. 



XYRIS, L. 



X. flexuosa, Muhl. YELLOW-EYED-GRASS. 

 Nagog Pond, Acton, Aug., 1882 (W. H. Manning) ; Ashland (Rev. 

 Thos. Morong). 



