228 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



C. Oederi Retz, var. pumila (Cosson & Germain) Fernald. — 

 Margins of ponds and roadside ditches ; frequent in the ^'alley. 



C. oligocarpa Schkuhr. — Rich woods; rare. Stockbridge; New 

 Marlboro. 



C. pallescena L. — Meadows and open woods; common. 



C. pauciflora Lightf. — Peat bogs; local. Ward and Lost Ponds, 

 Becket; Wolf Swamp, Sandisfield. 



C. paupercula Michx. — Sandisfield (Walters). 



var. irrigua (Wahlenb.) Fernald. — Sphagnum swamps; local. 

 Pittsfield; Becket. 



var. pallens Fernald. — Shaded sphagnum .swamps; local. Wash- 

 ington (Boott); Pittsfield; New Marlboro. 



C. pedunculata Muhl. — Open woods; common, particularly in 

 rocky woods. 



C. pennsylvanica Lam. — Dry open woods and clearings; com- 

 mon. 



var. lucorum (Willd.) Fernald. — Occasional. Dry woods. New 

 Marlboro; rocky woods. West Stockbridge; dry woods, Mt. Washing- 

 ton (Knowlton); dry woods, Sheffield (Bean and Fernald). 



C. plantaginea Lam. — Rich woods; frequent in the valley and on 

 the lower slopes of the mountains. 



Culms 6.5 cm. high, Stockbridge. 



C. platyphylla Carey. — Rich woods; common in the valley. 



C. polygama Schkuhr.— (C. Buxhcmmii 111. Fl. ed. 2.) 



Joyner's Marsh, Egremont. 



C. prasina Wahlenb. — Wet spots in woods; frequent in the valley 

 and on the lower slopes of the mountains. 



C. projecta Mackenzie. — (C. tribuloidcs, var. reduda Man. ed. 7; 

 vid. Bull. Torr. Bot. Club, 35: 264, 1908.) 



Borders of swamps and wet woods; frequent in the valley, common 

 on the plateau. 



C. Pseudo-Cyperus L. — Border of Spectacle Pond, Sandisfield; 

 Sheffield (Walters). 



C. pubescens Muhl. — Rich woods, in damp glades and alluvial 

 thickets; frequent. 



C. retrorsa Schwein. — Borders of ponds and streams, wet spots 

 in meadows; common in the valley. 



var. Hartii (Dewey) Gray. — River alluvium, Sheffield (Churchill). 



var. Robinsonii Fernald. — Shore of Richmond Lake, Richmond. 



