284 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Ill-drained fields and borders of swamps; common. Occasionally 
on dry caleiireous hills. Less common on the plateau. 
P. monspeliensis L. — Damp places and cultivated ground; com- 
mon. 
P. palustris (L.) Scop. Marsh Cinquefoil. — {Comarum palus- 
trc 111. Fl. ed. 2.) 
Borders of ponds, slow streams and pools in swamps; frequent. 
forma subsericea (Becker) \\o\L— {Vid. Rhodora, 15: 165, 
1913.) 
Occasional. Shaw Pond, Otis; Lake Duel, Monterey. 
Leaves silky. 
P. pumila Poir. — Dry, barren fields; frequent in the valley, be- 
coming common in the southern part. 
P. RECTA L. — Fields and roadsides; occasional. Pittsfield; Stock- 
bridge (Mrs. B. Hoffmann); Great Barrington (Walters); Sheffield. 
First noted in 1915. 
P. tridentata Ait. — {Sibbaldiopsis tridcntata 111. Fl. ed. 2.) 
Rocky summits; occasional. Florida; Tom Ball, Alford; The 
Dome, Mt. Washington. In Sheffield a patch occurs in a low meadow 
at the foot of The Dome, at an altitude of 700 feet. 
PRUNUS. Plum; Cherry. * 
P. americana Marsh. Wild Plum. — Roadsides in New Marl- 
boro (Walters). 
P. AVIUM L. Sweet Cherry.— Frequently escaping to open 
woods and hedgerows. 
P. Cerasus L. Sour Cherry. — Rarely spreading from cultiva- 
tion. Sandisfield. 
P. cuneata Raf. Sand Cherry. — Sand-plains; rare. Pittsfield 
(Lincoln); Sheffield. Also on Alum Hill, Sheffield. 
P. DOMESTiCA L. Garden Plum. — Occasionally spreading from 
cultivation. 
P. nigra Ait. Wild or Canada Plum. — Riverbanks and road- 
side thickets; frequent. 
P. pennsylvanica L. f. Wild Red Cherry; Bird Cherry. — 
Light soil in woods, recent clearings, burnt tracts and rocky summits ; 
common, particularly on the upland. Occasional in swampy woods, 
Stockbridge. 
P. PERSICA (L.) Stokes. Peach. — (Amygdalus persica Ill.Fl.ed. 2.) 
