HOFFMANN: FLORA OF BERKSHIRE COUNTY. 253 



JUGLANS. 



J. cinereaL. Butternut. — Rich woods, open hillsides; common 

 in the valley, frequent on the lower portions of the plateau (altitude 

 1800 feet, Becket). 



BETULACEAE. BIRCH FAMILY. 

 ALNUS. Alder. 



A. incana (L.) Moench. Speckled Alder. — Along streams, 

 borders of swamps, and on the plateau along roadsides; common. 



A. crispa (Ait.) Pursh, var. mollis Fernald. — Downy Green 

 Alder. — (A. mollis Man. ed. 7; vid. Rhodora, 15: 4, 1913. A. 

 Alnohetula 111. Fl. ed. 2.) 



Hoosac Mt., Florida; along the Deerfield River, Florida. 



A. rugosa (Du Roi) Spreng. Smooth Alder. — Borders of lakes 

 and streams; occasional in the southern part of the valley. Stock- 

 bridge; New Marlboro (^Yalters); Sheffield. 



BETULA. BiucH. 



B. alba L., var. cordifolia (Regel) Fernald. Paper Birch; 

 Canoe Birch. — {B. cordifolia 111. Fl. ed. 2.) 



Hillsides; occasional. Pittsfield; West Stockbridge; Egremont 

 (Walters). 



var. papyrifera (Marsh) Spach. — {B. papyrifera 111. Fl. ed. 2.) 



Woods; common. A specimen from Otis, determined by Dr. 

 Rehder, with mature leaves only 5 cm. long. 



B. lenta L. Black Birch; Cherry Birch. — Rich woods, banks 

 of streams; frequent. 



B. lutea Miclix. f. Yellow Birch. — Cool rocky woods; common. 



B. populifolia Marsh. White Birch; Gray Birch. — Sandy or 

 ill-drained soil; common in the southern part of the County, frequent 

 elsewhere. Summits of Greylock (altitude 3400 feet) and The Dome. 



B. pumila L. Low or Swamp Birch. — Cold bogs; local. D. D. 

 Field swamp and Nigger Pond, Stockbridge; Juniper Pond, New 

 Marlboro. 



CARPINUS. Hohnbeam; Ihonw'ood. 



C. caroliniana Walt. .Vmi:rican Hornhkam; Blue ok Water 

 Beech. — Along streams and borders of swamps, cool rocky iiiiisides; 

 frequent. 



