HOFFMANN: FLORA OF BERKSHIRE COUNTY. 231 



C. trichocarpa Muhl. — Marshes in the Hoosac Valley. Williams- 

 town (Churchill). 



C. trisperma Dewey. — Swampy woods; common. 



var. Billingsii Knight. — Peat bogs; local. Savoy; Lost Pond, 

 Becket; Wolf Swamp, Sandisfield. 



C. Tuckermani Dewey. — Swales in the Housatonic and Konkapot 

 Valleys in the southern part of the County; frequent in Sheffield, 

 occasional elsewhere (Stockbridge, New Marlboro). 



C. typhina Schwein. — (C. typhinoides Man. ed. 7; vid. Rhodora, 

 11: 40, 1909.) 



Shaded swale in the southern part of Sheffield, just inside the State 

 Line. 



C. umbellata Schkuhr. — Rocky summits and dry open soil; 

 frequent. 



var. brevirostris Boott. — (C. abdita III. FI. ed. 2.) 



Rocky or sandy soil. Williamstown; Sandisfield; Sheffield. 



var. tonsa Fernald. — (C. tonsa 111. Fl. ed. 2.) 



Sand-plain, Ashley Falls, Sheffield. 



C. varia Muhl.— (Man. ed. 7.) 



Rocky woods; frequent in the valley. According to Mr. K. K. 

 Mackenzie, Berkshire material corresponds to C. Emmonsii Dewey. 



C. vesicaria L. — Shaded swamps and swales; frequent. 



var. jejuna Fernald. — (C monile 111. Fl. ed. 2 ui part.) 



Swale near the Housatonic River, Lenox. A form closely approach- 

 ing this variety at Ward Pond, Becket. 



var. monile (Tuckerm.) Fernald. — Swampy ground; occasional. 

 Richmond; Lenox. 



C. virescens Muhl. — Dry, open woods, and clearings; common in 

 the valley. 



var. Swanii Fernald. — (C. Swanii 111. Fl. ed. 2.) 



Dry, open woods and hillside pastures; common. 



C. vulpinoidea Michx. — Low ground; common. 



C. lupulina X lurida. — Low ground; occasional. Stockbridge; 

 Great Barrington. 



CLADIUIVI. Twig Rush. 

 (Mariscus 111. Fl. ed. 2.) 



C. mariscoides (Muhl.) Torr. — Bogs and marshes; occasional in 

 the valley. Stockbridge; Great Barrington; Egremont; Sheffield. 



