1911] Flora of the Boston District,— X 85 
ported from Gloucester to Watertown; also by fresh water at Spot 
Pond, Stoneham (L. H. Bailey, Aug. 1, 1883). 
S. occidentalis (Wats.) Chase. In water near pond margins; 
Pleasant Pond, Wenham (J. A. Lowell, July, 1847); “Essex Co.” 
(Wm. Oakes, no date); Revere (H. A. Young, September, 1878); 
Fresh Pond, Cambridge (Wm. Boott, July 9, 1853); Heard’s Pond, 
Wayland (G. G. Kennedy, Aug. 22, 1910). 
S. Olneyi Gray. Ditches in salt marsh, Kent’s Island, Newbury 
(A. A. Eaton, Aug. 12, 1897). 
S. pedicellatus Fernald. “Merrimac Valley” (J. Robinson, June 
22, 1879). A northern species, rare in this district. 
S. pedicellatus Fernald, var. pullus Fernald. Pleasant Valley, 
Amesbury (A. A. Eaton, Aug. 28, 1897); swampy shore, Coy’s Pond, 
Wenham (C. H. Knowlton, Sept. 20, 1908). 
S. planifolius Muhl. Dry open woods and rocky hillsides. Not 
reported from northwest or southeast, abundant elsewhere. 
S. robustus Pursh. Salt marshes; Newbury (E. F. Williams, 
July 31, 1898); Dorchester (J. R. Churchill, Sept. 13, 1903). 
S. rubrotinctus Fernald. Wet places, common throughout. 
S. Smithii Gray. Muddy shores; Shawsheen River near pond, 
North Andover (J. Blake, September, 1883); Heard's Pond, Wayland 
(M. L. Fernald, Sept. 10, 1909; M. L. Fernald & A. J. Eames, Sept. 
18, 1909. See RHopona XI, 220, 1909); Westwood (W. P. Rich, 
Oct. 6, 1901). 
S. subterminalis Torr. Ponds and slow streams, mostly sub- 
merged. Not reported in southern section, but frequent elsewhere. 
S. sylvaticus L. Wet places; Lawrence, Andover, Revere, Woburn, 
Winchester, Sudbury. 
S. Torreyi Olney. Inshallow water and mud; Lawrence, Medford, 
Concord, Dedham, Ponkapaug Pond (Canton or Randolph), Wellesley; 
Groton, Westford, Stoneham, Littleton (according to Dame & Collins, 
Fl. Middlesex Co. 113, 1888). 
S. validus, Vahl. In water of ponds and brooks, common. 
C. H. KNOWLTON 
J. A. CUSHMAN 
WALTER DEANE 
A. K. Harrison 
Committee on 
Local Flora. 
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