HOFFMANN: FLORA OF BERKSHIRE COUNTY. 345 



b'. Leaf-base tapering, not sagittate f. angustipes. 



Leaves with broadly falcate, or obovate and obliquely truncate, entire 

 or toothed lobes; upper leaves similar or unlobed and lanceolate or 

 ovate-lanceolate, rarely oblanceolate or obovate, entire or rarely 

 toothed. 



c. Leaf -base sagittate, clasping var. latifolia. 



c'. Leaf -base tapering, not sagittate f. exauriculata. 



Leaves all unlobed, lanceolate, oblong, oblanceolate or obovate, entire 

 or denticulate, the lowest sometimes shallowly lobed. 

 d. Cauline leaves lanceolate to ovate lanceolate, entire or rarely 

 toothed. 



e. Leaf-base sagittate, clasping var. integrifolia. 



e'. Leaf-base not sagittate f. angustata. 



d'. Cauline leaves oblanceolate or obovate, usually toothed. 



/. Leaf-base sagittately clasping var. obovata. 



/'. Leaf-base tapering, not sagittate f. stenopoda. 



L. canadensis L., var. typica Wiegand. Wild Lettuce; Horse- 

 weed. — Roadsides, thickets and low ground; frequent. 



var. typica Wiegand, forma angustipes Wiegand. — Roadsides, 

 dry wopds and low ground; frequent. Often hirsute on the lower 

 part of the stem. 



var. latifolia O. Kuntze. — Roadsides, thickets and low ground; 

 common. 



var. latifolia O. Kuntze, f. exauriculata Wiegand. — With the 

 type; occasional. 



var. integrifolia (Bigel.) Gray. — Occasional, Mt. Washington. 



var. integrifolia (Bigel.) Gray, f. angustata Wiegand. — Occa- 

 sional; dry thicket, Stockbridge. 



var. obovata Wiegand. — (L. integrifolia Man. ed. 7.) 



Chesliire (E. J. Winslow). 



var. obovata Wiegand, f. stenopoda Wiegand. — A specimen 

 transitional to \ar. integrifolia, f. angustata from a (h-y roadside thicket, 

 New IMarlhoro. 



The above forms have been determined by Professor Wiegand. 



L. SCARIOLA L. Prickly Lettuce. — Waste ground; rart>. Wil- 

 liamstown (Churchill); Pittsfield. 



var. iNTKGUAT.v Gren. & (Jodr. — Waste ground; occasional. 

 'Florichi; Cheshire; Great Harrington. 



L. spicata (Lam.) llitclic. Wild Hlik Lkttuck. — Shadetl banks; 

 conuuoi). 



