Vol. III.] 



CHICORY FAMILY. 



275 



ig-3542.) 



6. Lactuca pulchella (Pursh) DC. Large-flowered Blue Lettuce. (F 



Sonchus pidchelhis Pursh, Fl. Am. Sept. 502. 1814. 

 Lactuca integrifolia Nutt. Gen. 2: 124. 1818. 

 Lactuca pulchella DC. Prodr. 7: 134. 1838. 



Perennial, glabrous throughout, somewhat 

 glaucous; stem rather slender, leafy up to the 

 corymbose-paniculate inflorescence, i-3 high. 

 Leaves linear-lanceolate, lanceolate or oblong, 

 acute, entire,. dentate, lobed or pinnatifid, those 

 of the stem sessile or partly clasping, 2 / -8 / long; 

 2 // -i8 // wide, the lowest and basal ones some- 

 times petioled; heads mostly numerous, 6 // -io // 

 broad; branches and peduncles scaly; involucre 

 well imbricated, 8 // -io // high, its outer bracts 

 successively shorter, ovate-lanceolate; rays 

 bright blue or violet; achenes oblong-lanceo- 

 late, flat, twice as long as their tapering beaks; 

 pappus white. 



In moist soil, western Ontario to the Northwest 

 Territory and British Columbia, south to Michigan, 

 Kansas, New Mexico and California. June-Sept. 



7. Lactuca villosa Jacq. Hairy- 

 veined Blue Lettuce. (Fig. 3543.) 



L. villosa Jacq. Hort. Schoen. 3: 62. pl.j6j. 1798- 

 Sonchus acuminalus Willd. Sp. PI. 3: 1521. 1804. 

 Mulgedium acuminatum DC. Prodr. 7: 249. 1838. 

 L. acuminata A. Gray. Proc. Am. Acad. 19: 73. 1883- 



Annual or biennial; stem glabrous, leafy up 

 to the paniculate inflorescence, 2-6 high. 

 Leaves oblong, ovate or lanceolate, acuminate, 

 acutely dentate or the teeth mucronate-tipped, 

 glabrous above, pubescent with short stiff hairs 

 on the veins beneath, sessile and slightly clasp- 

 ing at the base, or petioled, 4 / -6 / long, i / -2^ / 

 wide, the lowest sometimes lobed at the base; 

 heads numerous, 3 // -5 // broad; peduncles usu- 

 ally minutely scaly; rays blue; involucre 

 about 5" high, its outer bracts much shorter 

 than the inner, some or all of them obtuse; 

 achenes thick, oblong, little flattened, nar- 

 rowed above; pappus white. 



In thickets, New York to Illinois, south to 

 Florida, Georgia and Kentucky. July-Sept. 



8. Lactuca Floridana (L.) Gaertn. 

 False or Florida Lettuce. (Fig. 3544.) 



Sonchus Floridanus L. Sp. PI. 794. 1753. 



Lactuca Floridana Gaertn. Fruct. & Sem. 2: 362. 1791. 



Mulgedium Floridanum DC. Prodr. 7: 349. 1791. 



Annual or biennial; stem glabrous, rather stout, 

 leafy up to the large, paniculate inflorescence, 

 3-7 high. Leaves deeply lyrate-pinnatifid, ses- 

 sile or petioled, 4 / -i2 / long, glabrous above, pubes- 

 cent on the veins beneath, the terminal segment 

 usually broad, triangular, acute or acuminate, the 

 lateral ones lanceolate to oval, acute, all usually 

 dentate, or the leaves irregularly lobed; heads 

 numerous, 2> // ~5 // broad; peduncles commonly 

 scaly; rays blue; involucre about 6 // high, its 

 outer bracts much smaller than the inner; achenes 

 thick, somewhat compressed, narrowed above into 

 short necks; pappus white. 



In moist,^open places, southern New York and Penn- 

 sylvania to Illinois and Nebraska (according to Web- 

 ber), south to Florida and Louisiana. July-Sept. 



