294 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



ZANTHOXYLUM. Prickly Ash. 



Z. americanum Mill. Prickly Ash. — River banks and open 

 rocky woods in the extreme southern part of the County; frequent in 

 Sheffield, and along the Konkapot River in southern New Marlboro, 

 occasional as far north as Stockbridge. 



POLYGALACEAE. MILKWORT FAMILY. 

 POLYGALA. Milkwort. 



P. paucifolia Willd. Fringed Polygala. — Light soil in dry 

 woods ; locally common in the southern towns, particularly in Sheffield, 

 Egremont, and Mt. Washington, frequent as far north as Stockbridge. 



P. sanguinea L. Purple Milkwort. — (P. viridescens 111. Fl. ed. 



2.) . _ 



Along roadsides and in poor soil in fields; occasional. Pittsfield; 



Becket; Sheffield (Churchill); Sandisfield. 



P. Senega L. Seneca Snakeroot. — Margin of Joyner's Marsh, 

 Egremont (Churchill and Schneider). 



P. verticillata L. — Sandy soil; occasional. Stockbridge; Sheffield 

 (Walters). . 



var. ambigua (Nutt.) Wood. — (P. ambigtia 111. Fl. ed. 2.) 



Sandy soil and sterile fields; frequent in the valley. 



EUPHORBIACEAE. SPURGE FAMILY. 

 ACALYPHA. Three-seeded Mercury. 



A. gracilens Gray.^ — Clearing in dry woods, with A. virginica 

 Monterey. 



A. virginica L. Three-seeded Mercury. — Cultivated and waste 

 ground, dry fields and muddy shores; common. 



EUPHORBIA. Spurge. 

 {Tithymalus and Chamaesyce 111. Fl. ed. 2.) 

 E. Cyparissias L. Cypress Spurge. — ( T. Cyparissias 111. Fl. ed. 



2.) 



Roadsides, cemeteries and about old houses; frequent. 



E. hirsuta (Torr.) Wiegand. — (C. Rafinesquii 111. Fl. ed. 2.) 



Dry open ground, roadsides, railroad tracks and cultivated ground; 



