310 FLOEA OF PHILADELPHIA. 



Leaves, at least their midribs, hirsute. 3. L. hirsuta. 

 Leaves entire or dentate, none of them pinnatifid. 



Leaves oblong or oblong-lanceolate; achene longer than 

 the beak. 4. L. sagittifolia. 



Leaves lanceolate; achene about equalling the beak. 



2. L. Canadensis. 

 Achenes beakless or with short necks, thickish ; flowers blue. 

 Leaves oblong to ovate, acuminate, dentate. 5. L. villosa. 

 Leaves pinnatifid, the terminal segment commonly triangular. 



6. L. Floridana. 

 Pappus brown; flowers blue to white. 7. L. spicata. 



1. Lactuca virosa L, Prickly Lettuce. M. p. 898. Waste grounds and 



roadsides. Summer. 



Philadelphia— GQrmanioyim (Me.), flat below Philadelphia, L. L. Smith 

 (B. Sm.), Fairmount Park (Wn.). jBitc/iS — Sellersville, Quakertown 

 (Fr.), New Hope (Ws.). If on<^o?«er)/—Shannonville (Cr.), Lafayette 

 (Wn.). Chester— Y alley Forge (Ja.). Lancaster— Peach Bottom (Ca.). 

 Northampton — Easton, Porter (B. C). 



Caviden—Kaighn's Point (.Ta.) (Wn.) (Li.). Gloucester— Uepaupo 

 (Li.). 



New Castle— MeCollovigh Iron Co., Jackson and Sharp, 7th and Church. 



2. Lactuca Canadensis L. Wild Lettuce. M. p. 898. Moist, open places. 



Summer and fall. 

 2a. Lactuca Canadensis Montana Britton. M. p. 898. Moist, open places. 

 Summer and fall. 

 Bucks— Point Pleasant, Dr. N. L. Britton (Fr.). 



3. Lactuca hirsuta Muhl. M. p. 898. Dry soil. Summer. 



Philadelphia— Bjherry, Mart. (B. C). Bucks— Near Sellersville (Fr.). 



Burlivgton—Ymcejatown (C). Cape Mai/— Anglesea (Li.), Wildwood 

 (Wn.). Atlantic— Atlantic City (C). Monmouth — STpving Lake (C), 

 Asbury Park (Wn.). 



4. Lactuca sagittifolia Ell. M. p. 898. Dry, open soil. Summer. 



PhiladeliJhia-BjheTTj, Mart. (B.C.). Bwcfcs— Near Sellersville (Fr.), 

 Solebury (Ws.). Delaware— Liansdowne (Pe.), Swarthmore (Pr.). Lan- 

 caster— (P.). Northampton— Haston, Porter (B. C). 



Gloricester-MicMeton, frequent (He.), Swedesboro (Li.). Monmouth 

 — Sandy Hook (C), Asbury Park (Wn.). 



Ne%v Castle— ^wmmit Bridge, etc.. Commons. 



5. Lactuca villosa Jacq. M. p. 899. Thickets. Summer. 



Philadelphia— Byherr J, Mart. (B. C). Bucks— Rook Hill (Fr.), Sole- 

 bury (Ws.). Monf^/omery— Shannonville (Cr.). Delaware— WmeTalHill 

 (He.), Valley of Darby Creek, Dr. Geo. Smith (B. Sm.), Concord (W. 

 Tr.). Lancaster — York Furnace (P.). 



Gloucester— SwedeshoYo (Li.). (Somerset— Rocky Hill (C). Hunter- 

 don — Rosemont (C). 



New Castle — Frequent. 



6. Lactuca Floridana (L.) Gaertn. M. p. 899. Rich soil. Summer. 



Bucks— Argna (Fr.). Delaware— 'Near Cpopertown, Dr. Geo. Smith 

 (B. Sm.). C^es^er— Mortonville (St.), Doe Run (Wn.). Lancaster— 

 (P.). Northampton — (P.). 



