182 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



In that year he collected Arabis Drummondii on Hoosac Plateau and 

 in the year 1920, forty-three years later, he is still active in the field, 

 adding new plants and new stations to the list. The brothers Charles 

 E. and Walter Faxon visited Lenox in 1872, and made collections there. 

 Professor C. S. Sargent collected Crataegus in the County in 1902 and 

 was the first to discover Qnercus Muhlenbergii as a native of the State. 

 Professor Brainerd was studying the violets of the County in the first 

 decade of the 20th century. The formation in 1895 of the New 

 England Botanical Club and the increased interest in the New England 

 flora resulting from that step has attracted to the County in the last 

 two decades many active collectors, whose work has enriched our knowl- 

 edge of its flora. Particularly notable was a visit by Professor Fernald 

 to Florida. Attracted by the presence on the geological map of the 

 County of a strip of serpentine, he visited the outcrop and added 

 two species to the county list: Arenaria viacrophylla and an indigenous 

 form of Cerastiiim arvense. 



From 1913 to 1917 the County had again for too short a time a 

 resident botanist. Mr. F. Walters in three seasons' collecting dis- 

 covered in the southern tier of towns a large number of interesting 

 plants which had not previously been reported from the County, 

 besides adding materially to our knowledge of the distribution of many 

 other species. 



Physiography. 



The plants comprised in the list published in this paper have been 

 all collected within the boundaries of Berkshire County, Massachu- 

 setts. A brief description of the physiographic features of the County 

 is essential to an understanding of the distribution of the plants here 

 listed. 



Berkshire County is the westernmost county in Massachusetts and 

 extends entirely across the State, from Vermont to Connecticut. Its 

 northern boundary is formed by Bennington County in Vermont and 

 its southern boundary by Litchfield County, Connecticut. On the 

 west it is bounded by Rensselaer and Columbia Counties, New York. 

 It extends from lat. 42° 45' north to about 42° 2' south, a distance of 

 about 49 miles. In breadth it varies from about 24 to about 12 miles. 

 Its area is about 1000 square miles. 



The main topographical features of the County are the Housatonic 



