84 Rhodora [May 
reported from northwestern portion of district, but apparently fre- 
quent elsewhere. 
S. cyperinus (L.) Kunth, var. Andrewsii Fernald. Glacialis, 
Cambridge (M. L. Fernald, Oct. 16, 1905). 
S. cyperinus (L.) Kunth, var. condensatus Fernald. Swamp east 
of Glacialis Pond, Cambridge (H. H. Bartlett, Oct. 17, 1905); railway 
near Hammond’s Pond marshes, Newton (Wm. Boott, Aug. 23, 1884); 
burned place, low ground, Cliff Road, Wellesley (K. M. Wiegand, 
July 27, 1908); swamp, Hingham (C. H. Knowlton, Sept. 18, 1910). 
S. cyperinus (L.) Kunth, var. pelius Fernald. Swamps, marshes 
and pond borders. Reported from several well-distributed stations, 
and probably common throughout. 
S. debilis Pursh. Swamps and sandy shores of ponds. Frequent 
in central and northeastern portions of district. 
S. debilis Pursh, var. Williamsii l'ernald. Massapoag Pond, 
Sharon (G. G. Kennedy, Aug. 31, 1892; E. F. Williams & M. L. 
Fernald, Sept. 7, 1901; other collections since. This is the type sta- 
tion, and the plant has never been collected elsewhere. Published 
in Ruopona III, 252, 1901. 
S. fluviatilis (Torr.) Gray. Ipswich River (J. Robinson, Aug. 
22-23, 1876); Lawrence (J. Robinson, Sept. 26, 1877); Brighton (C. 
E. Perkins, June 30, 1879); in deep water, Heard's Pond, Wayland 
(G. G. Kennedy, Aug. 22, 1910). 
S. georgianus Harper. Moist soil; frequent in northern and cen- 
tral portions, doubtless common throughout. 
S. Hallii Gray. Sandy shore, Winter Pond, Winchester (Wm. 
Boott, Sept. 10, 1876. Numerous other collectors since). The 
only known station northeast of Georgia and east of Illinois. 
S. heterochaetus Chase. Banks of Charles River at Cow Bay, 
Dedham (F. F. Forbes, Aug. 7, 1907). 
S. hudsonianus (Michx.) Fernald. Wet meadows and peat-bogs, 
occasional in Essex and Middlesex counties. A northern plant, rare 
in our district. 
S. Longii Fernald. Boston (C. E. Faxon, no date); swamp, 
Chamberlain lot, Dedham (F . F. Forbes, June 3, 1900); damp ground, 
Charles River meadows, Dedham (F. F. Forbes, June 26, 1908). A 
new segregate, to be looked for elsewhere in the district. See RHo- 
DORA XIII, 4, 1911. 
S. nanus Spreng. Salt marshes and shores of tidal streams. Re- 
