284 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



Ill-drained fields and borders of swamps; common. Occasionally 

 on dry calcareous hills. Less common on the plateau. 



P. monspeliensis L. — Damp places and cultivated ground; com- 

 mon. 



P. palustris (L.) Scop. Marsh Cinquefoil. — (Comarum palus- 

 tre 111. Fl. ed. 2.) 



Borders of ponds, slow streams and pools in swamps; frequent. 



forma subsericea (Becker) Wolf. — {Vid. Rhodora, 15: 165, 

 1913.) 



Occasional. Shaw Pond, Otis; Lake Buel, 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 tridentaia 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 

 w'oods 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. DOMESTIC A 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 IlI.Fl.ed. 2.) 



