220 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



P. tsugetorum Nash. — Dry woods; frequent in the southern part 

 of the valley. 



P. Tuckermani Fernald.— (P. philadelphicum Man. ed. 7 and 111. 

 Fl. ed. 2 in part.) 



Ditches, sandy roadsides and shores; occasional. Pontoosue Lake, 

 Pittsfield; Becket; West Stockbridge; Egremont; Mt. Washington; 

 moist limestone outcrop, Sheffield. 



Pulvini hispid: 



Spikelets all or nearly all long-pedioelled, 2 to 3 mm. long; panicle tardily 



exserted, its lower branches mostly included during anthesis. . . .P. capillare. 



Spikelets subsessile or only short-pedicelled along the ultimate branchlets ; 



panicle exserted in anthesis P. capillare, var. occidentale. 



Pulvini glabrous or merely ciliate at tip. 



P- Tuckermani [vid. Rhodora, 21: 111, 1919). 



P. umbrosum LeConte. — (P. Ashei Man. ed. 7 and 111. Fl. ed. 2; 

 vid. Rhodora, 14: 173, 1912.) 



Rocky vi^oods and open sandy soil; occasional in the southern part 

 of the valley. Great Barrington; Sheffield. 



P. Werneri Scribn. — Dry open woods and fields, rocky summits; 

 common in the valley. 



P. xanthophysum Gray. — Dry open woods and clearings; occa- 

 sional in the western and southern parts of the valley; Hancock Mt., 

 Pittsfield; Monterey; Great Barrington; Sandisfield; Sheffield. 



PASPALTJM. 



P. Muhlenbergii Nash. — Sterile, sandy fields; common in the 

 southern part of the valley. 



PHALARIS. Canaby Grass. 



P. arundinacea L. Reed Canaby Grass. — Marshes and borders 

 of brooks; frequent. 



forma PICTA (L.), comb. nov. Ribbon Grass. — An occasional 

 escape from gardens; Williamstown; New Ashford; Stockbridge. 



PHLEITM. 



P. PRATENSE L. Herd's Grass; Timothy. — Grassland and wood 

 roads; common. 



