220 riiOCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
P. tsugetorum Nash. — Dry woods; frequent in the southern part 
of the valley. 
P. Tuckermani Fernald. — (P. yhUadeljMcum Man. ed. 7 and 111. 
Fl. ed. 2 in part.) 
Ditches, sandy roadsides and shores; occasional. Pontoosuc Lake, 
Pittsfield; Bceket; West Stockhridge; Egreniont; Mt. Washington; 
moist limestone outcrop, Sheffield. 
I'ulvini hispi<l: 
Spikelets all or nearly all long-pedicelled, 2 to 3 mm. long; panicle tardily 
exserted, its lower branches mostly included during anthesis. . . P. capillnre. 
Spikelets subsessile or only short-pedicelled along the ultimate branchlets; 
panicle exserted in anthesis P. cajnllare, var. orxideTdale. 
Pulvini glabrous or merely ciliate at tip. 
P. Tuckermani {vUl. Rhodora, 21: 111, 1919). 
P. umbrosum LeConte. — {P. Ashei Man. ed. 7 and 111. Fl. ed. 2; 
vid. Rhodora, 14: 173, 1912.) 
Rocky woods 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. 
PASPALUM. 
P. Muhlenbergii Nash. — Sterile, sandy fields; common in the 
southern part of the valley. 
PHALARIS. Canary Grass. 
P. arundinacea L. Reed Canary Grass. — Marshes and borders 
of brooks; frecpient. 
forma picta (L.), comb. nov. Ribbon Grass. — An occasional 
escape from gardens; Williamstown; New Ashford; Stockbridge. 
PHLEUM. 
P. PRATENSE L. Herd's Grass; Timothy. — Grassland and wood 
roads; common. 
