342 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



a'. Florets 5 to 7 (rarely 3 to 8) ; inflorescence convex; stems rarely speckled, 

 more or less glaucous. 



Stems fistulose, purple, plainly glaucous; leaves in 4's to 6's, bluntly 

 toothed, scabrous-puberulent beneath or glabrate; florets scarcely 

 exserted ; corolla 3.5 to 4.8 mm. long, very rarely longer . .E. purpureum. 



Stems solid, green with purple nodes, faintly glaucous; leaves in 3's or 4's, 

 very rarely in 2's or 5's, sharply toothed, villous-pubescent beneath, or 

 glabrate; florets much exserted; corollas 5.5 to 7.5 mm. long; heads 

 paler than in the other species E. falcatum. 



E. falcatum Mickx. — {E. purpureum Man, ed. 7 in part; md. 

 Ehodora, 22: 68, 1920.) 



Dry woods, Stockbridge, New Marlboro. 



E. maculatum L. Joe-Pte Weed. — (E. purpureum, var. macu- 

 latum Man. ed. 7; vid. Rhodora, 22: 64, 1920.) 



Wet meadows and borders of swamps; common. 



A plant from swampy woods, Lenox, with the upper leaves 26 cm. 

 long and about 4 cm. broad has been determined by Professor Wiegand 

 as a shade form of this species. 



E. perfoliatum L. Boneset; Thoeoughwokt. — Low ground; 

 common. 



A form with the leaves in 3's from Sheffield (Walters). 



var. truncatum Gray. — Damp woods, Mt. Washington; Sheffield 

 (Walters). 



E. purpureum L. Joe-Pte Weed. — Rich open woods and road- 

 side thickets; common in the valley. 



E. sessilifolium L. — Dry open woods on limestone knoll. New 

 Marlboro. 



E. urticaefolium Reichard. White Snakeeoot. — Rich woods; 

 common. Altitude 2500 feet, Greyloclf;. 



GALINSOGA. 



G. PAEviFLOEA Cav. — Railroad, Cheshire (Churchill) ; cultivated 

 ground, Lenox; garden weed, Sheffield. First noted in 1918. 



G. AEisTULATA Bicknell. — (G. parviflora, var. hispida Man. ed. 7; 

 vid. Rhodora, 22: 98, 1920.) 



First noted in 1899 and now thoroughly established as a garden 

 weed and in waste places in the valley. Introduced from South 

 America. 



