208 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
S. graminea Michx. — Lake shores; occasional in the valley. 
Onota Lake, Pittsfielcl, submersed; gravelly shore of Richmond Lake, 
Richmond, emcrsed; Stockbridge Bowl, Stockbridge. 
S. heterophylla Pursh, forma fluitans Blake. — Vid. Rhodora, 
15: L59 (1913). (S. rujida Til. Fl. ed. 2.) 
Leaves all linear, or phyllodial and bladeless. 
Shallow water of ponds; occasional. Stockbridge Bowl, Stock- 
bridge; Crane Pond, West Stockbridge; Guilder Pond, Mt. Washing- 
ton, altitude 2000 feet. 
S. latifolia Wllld. — Muddy shores and swamps; common. Five 
forms of this variable species occui in Berkshire County. The type 
form has been collected in Cheshire (Winslow) and North Adams 
(Fernald and Long). 
forma diversifolia (Engelm.) Robinson. — Borders of lakes; fre- 
quent. 
forma gracilis (Pursh) Robinson. — Shallow water, borders of lakes 
and streams; frequent. 
forma hastata (Pursh) Robinson. — Shallow water; common. 
forma obtusa (Muhl.) Robinson. — Swamps and riverbanks; fre- 
quent. 
HYDROCHARITACEAE. FROG'S BIT FAMILY. 
ELODEA. Water-weed. 
{Philotria 111. Fl. ed. 2.) 
E. canadensis Michx. Water-weed. — Shallow water in ponds 
and streams; common in the valley. 
VALLISNERIA, Eel Grass. 
V. americana Michx. Eel Grass. — ( V. spiralis Man. ed. 7; 
vid. Rhodora, 20: lOS, 1918.) 
Shallow water of ponds and in the Housatonic River; frequent. 
Onota Lake, Pittsfield, covering the sandy bottom densely over many 
acres, turning reddish in September and browning the surface of the 
water; Stockbridge Bowl, Stockbridge; Crane Pond, West Stock- 
bridge; shallow lagoons of the Housatonic Ri^'er from Stockbridge to 
Sheffield. 
