HOFFMANN: FLORA OF BERKSHIRE COUNTY. 285 



Occasional on dumps; Williamstown; North Adams. 



P. serotina Ehi-h. Black Cheery; Rtnvr Cheret. — {Padua 

 virginiana 111. Fl. ed. 2.) 



Rich woods and roadsides; common. Altitude 1800 feet, Savoy; 

 2600 feet, Greylock. 



P. virginiana L. Choke Cheeey. — (Padus nana 111. Fl. ed. 2.) 



Roadside thickets, fence-rows, borders of woods and mountain- 

 tops; common. Summit of Greylock, 3400 feet. 



PYRUS. Apple; Pear. 



P. americana (Marsh) DC American Mountain Ash. — 

 (Sorbiis americana 111. Fl. ed. 2.) 



Open woods; common on the upland. Borders of cool swamps in 

 the valley. 



P. arbutifolia (L.) L. f., var. atropurpurea (Britton) Robinson. 

 Red Chokebeeey. — (Aronia atropurpurea 111. Fl. ed. 2.) 



Swamps and borders of bogs; frequent in the southern part of the 

 valley. Rocky hillside, Monterey. Specimens with 12- to 14-fruited 

 cymes from Sheffield (Churchill). 



P. COMMUNIS L. Pear. — Occasionally self-sown in pastures and 

 woodland. 



P. Malus L. Apple. — (Malus malus 111. Fl. ed. 2.) 



Roadsides and woods; commQn. 



P. melanocarpa (Michx.) Willd. Black Chokebeeey. — {Aronia 

 melanocarpa 111. Fl. ed. 2.) 



Dry rocky or sandy soil, hillside pastures on the plateau, and in 

 swamps and bogs; common. 



X P. PRUNiFOLiA Willd. Crab Apple. — Roadside escape, Shef- 

 field. 



P. sitchensis (Roem.) Piper. — {Sorbus scopulina 111. Fl. ed. 2.) 



Occasional on Greylock; Hancock (Bean). 



According to Dr. Rehder {in lit.) P. sitchensis (Roem.) Piper is a 

 species of the Pacific Coast, and the New England species is Sorbus 

 decora Schneid. 



ROSA. Rose. 



R. blanda Ait. — Dry open woods, roadside thickets and borders 

 of streams; occasional. Greylock, altitude 2500 feet; Stockbridge; 

 West Stockbridge; Sandisfield; New Marlboro; Sheffield. 



