1916] Flora of the Boston District, XXII 89 



S. AQUATICA (L.) Scop. Beside railway track, Xewtonville (C. J. 

 Sprague, August, 1881; specimens in Gray Herb, and herb. Boston 

 Soc. Nat. Hist.). 



S. borealis Bigel., var. floribunda Femald. (See Rhodora xvi. 

 150-151, 1914). Waltham (F. S. Collins, June 17, 1886; specimen 

 in herb. N. E. Botanical Club). 



S. borealis Bigel., var. isophylla Femald. (See above.) Wet 

 woods and brooks in central portion of district, rare. 



S. graminea L. Moist fields, frequent. 



S. longifolia Muhl. Moist grassy places; Newburyport, Dan vers, 

 Andover, Lowell, Woburn, Brookline, Roxbury; Lynnfield and 

 Salem, according to Robinson, Fl. Essex Co. 38, 1880. 



S. media (L.) Cyrill. A very common garden weed in rich soil 

 throughout, blossoming at all seasons. 



S. uliginosa Murr. Wet places, occasional, but not reported 

 south of Hingham and Canton. 



PORTULACACEAE. 



PORTULACA. 



P. oleracea L. A common garden weed in our territory and the 

 least often collected. 



[Claytonia Virginica L. is reported rather vaguely in Robinson, 

 Fl. Essex Co. 40, 1880, but there are no specimens from Essex Co. in 

 the herbarium of the Peabody Academy of Science.] 



CERATOPHYLLACEAE. 



CERATOPHYLLUM. 



C. demersum L. Ponds and slow streams; occasional, but not 

 reported south of Boston. 



NYMPHAEACEAE. 



BRASENIA. 



B. Schreberi Gmel. Shallow ponds and slow streams, frequent. 



