HOFFMANN: FLORA OF BERKSHIRE COUNTY. 233 



E. palustris (L.) R. &. S. — Marshes, muddy shores and shallow 

 water; common. 



E, tenuis (Willd.) Schultes. — Wet places; common. 



ERIOPHORUM. Cotton Gbass. 



E. callitrix Cham. Hake's Tail. — Peat bogs; occasional on the 

 plateau. Savoy; Becket; Washington; New Marlboro. 



E. gracile Roth.- — Marshes and peat bogs; occasional. Cheshire 

 (Cushman); Becket (Walters); Monterey. 



E. tenellum Nutt. — Bogs and marshes; frequent. 



E. virginicum L. — Wet meadows and bogs; frequent. 



var. album Gray. — Occasional on the plateau. Washington; Otis. 



E. viridi-carinatum (Engelm.) Fernald. — Wet meadows and 

 swamps; common. 



var. Fellowsii Fernald. — Larch swamp, Sheffield (Fernald). 



FIMBRISTYLIS. 



F. Frankii Steud. — Gravelly border of Richmond Lake, Richmond; 

 sandy border of Konkapot River, Sheffield. 



RYNCHOSPORA. Beak Rush. 



R. alba (L.) Vahl. — Bogs and marshes; frequent. 



var. macra Clarke. — Hayes Pond, Otis (Walters). 



R. capitellata (Michx.) Vahl. — {R. glomerata Man. ed. 7 and 111. 

 Fl. ed. 2; vid. Rhodora, 20: 26, 1918.) 



Wet, peaty meadows, ill-drained hillsides and gravelly shores, 

 occasional. Williamstown; Florida, flood-plain of the Deerfield 

 River; Tyringham; Sheffield. 



SCIRPUS. Bulrush. 



Key to Scirpus. 



a. Involucre none, bristles white, long, giving the head the aspect of Erio- 



pkorum S. hudsonianus. 



a'. Involucre foliaeeous. ' " 



b. Involuoral bract one (occasionally with a secondary, small involucel) 

 appearing to be a continuation of the culm, 

 c. Spikelets solitary; culms flaccid; plant aquatic . . . S. subterminalis 

 c'. Spikelets distinct, paniculate or glomerulate. 

 d. Spikelets sessile or in glomerules. 



