294 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
ZANTHOXYLUM. I'kkkly Ash. 
Z. americanum Mill. Prickly Ash. — River hanks 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 Stockhridge. 
POL^OALACEAK. MILKWOR^F FAMILY. 
POLYGALA. Milkwort. 
P. paucifolia Willd. Frixgj:d Polygala.— Light soil in dry 
woods; locally common in the southern towns, particularly in Sheffield, 
Egremont, and Mt. Washington, frequent as far north as Stockl)ridge. 
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. Stockhridge; Sheffield 
(\Yalters). 
var. ambigua (Nutt.) Wood. — (P. ombigua 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. Cy'parissias 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; 
