HOFFMANN: FLORA OF BERKSHIRE COUNTY. 305 



Roadside ditches, swamps, moist clearings and borders of streams; 

 common. 



E. HiRSUTUM L. — Established in a roadside ditch in low ground, 

 Lenox. 



E. molle Torr.— {E. strictum 111. Fl. ed. 2.) 



Bogs; common. 



E. palustre L. — Low ground, Stockbridge. 



\ ar. monticola Haussk. — Bogs and wet meadows; frequent. 



GAURA. 



G. BIENNIS L. — Rarely adventive in grassland or waste ground. 

 North Adams; I/Ce. 



LUDVIGIA. False Loosestrife. 

 (Isnardia 111. Fl. ed. 2.) 



L. palustris (L.) Ell. Water Purslane. — Muddy borders of 

 ponds and marshes, and in ditches; common. 



OENOTHERA. Evening Primrose. 



O. biennis L. Common Evening Primrose. — Fields, roadsides 

 and clearings; common. 



O. muricata L. — Dry hillsides, roadsides and waste ground; 

 common. 



O. pumila L. — {Knciffia jmmila 111. Fl. ed. 2.) 



Fields and roadsides; common. 



HALORAGIDACEAE. WATER MILFOIL FAMILY. 

 MYRIOPHYLLUM. Watkk Milfoil. 



M. exalbescens lu-rnald.— Vid. Rhodora, 21: 122 (1919). 



Shallow water in i)onds; occasional. Stockbridge Bowl, Stock- 

 bridge; Cranberry Pond, West Stockbridge; Three-mile Pond. 

 Sheffield. 



Differs from M. spicnium as follows: the principal leaves of the 

 primary stems have 14 to 21 pairs of rigi<l slenderly linear divisions; 

 the bracts are rhombic obovate; the bractlets are suborbicular or 

 reniform, broader than long, and <listinctly shorter than in most of 

 M. exalbescens, 0.5 to 0.8 mm. long. 



