204 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
PICEA. Si-RucE. 
P. mariana (Mill) BSP. Bog Spruce; Black Spruce. — Peat 
bogs; occasional. Adams (Knowlton & Bean); Ward Pond, Becket; 
Wolf Swamp, Sandisfield. In the last two localities the Spruce is the 
host for Dwarf IVlistletoe {Arceuthohium). 
P. rubra (DuRoi) Dictr. Red Spruce.— (P. rubens 111. Fl. ed. 2.) 
Rocky summits on the plateau; occasional in the valley, (a few 
trees in a swamp in Stockhridge). Some fine timber still left on Grey- 
lock. 
forma virgata Rehder. — Williamstown (Walker). 
Differs from the type by the long and slender branches entirely 
destitute of branchlets (rid. Rhodora, 9: 110, 1907). 
PINUS. Pine. 
P. resinosa Ait. Red Pine; Norway Pine. — Rocky woods; 
rare. Summit of Tom Ball, Alford; Stockbridge. 
P. rigida IMill. Pitch Pine. — Sandy soil; frequent in Sheffield, 
occasional in Stockbridge, New Marlboro, Sandisfield, Great Barring- 
ton; summit of The Dome, Mt. Washington. 
P. Strobus L. White Pine. — In almost every soil and situation; 
common. Young pines grow up in the shelter of Hardback (Poten- 
tilla fruticosa) and gradually kill it out. 
P. SYLVESTRis L. ScoTCH PiNE. — An occasional escape from 
cultivation. Lanesboro (Walters). 
THUJA. Arbor Vitae. 
T. occiDENTALis L. Arbor Vitae ; White Cedar. — Commonly 
planted and occasionally spreading. Although Arbor Vitae has been 
found native in Connecticut and New York, in localities close to Berk- 
shire Co., no native trees have been discovered in the County. 
TSUGA. Hemlock. 
T. canadensis (L.) Carr. Hemlock. — Rocky woods; common. 
; TYPHACEAE. CAT-TAIL FAMILY. 
TYPHA. Cat-tail. 
r T. angustifolia L. — Borders of swamps; rare. Stockbridge; 
Sandisfield. 
