Tall biennial or perennial herbs with strict stems, usually glaucous, 
andjmilky juice. Leaves frequently pinnatifid at least in the lower parts, 
the upper usually entire, the lobes acute. Heads radiate, oblong, their 
involucres consisting of several series of unequal erect lanceolate bracts 
which become strongly reflexed in fruit; receptacle naked. Flowers yellowish 
or whitish or blue. Achenes strongly flattened, more of less elliptical and 
curving, ribbed. on esa faces , topowine oi the apex cither inte a short necks 
EPR GED Oa ME etn foptuny wty ke Uark pre ov Atnde, Crate , 
0 Leaves clasping the stems 
& tectucs ‘Pourn.)L. Lettuce, 
4 lidribs bearing prickles on the lower surface /. Le Scariola 
® Midribs smooth 
4 Achenes narrowed into a short neck at the apex 
upon which tné paprpus is borne; terminal 
%{lobes of the leaves aeltoid, 4-6 cm. wide; 
flowers pale blue ga. Le spicata 
WwW 4 Achenes narrowed into a slender beak 1.5 mm. 
long upon which the pappus is borne; termin- 
al lobes of the leaves narrowly lanceolate, 
commonly 5-6 mn. wide; flowers yellow 3. Lb. canadensis 
o Leaves not clasping the stem or but little, mostly 
4 narrowed toward the base ' be pulchella 
Prickly Lettuce.” 
CLM Le Scariola var. intesrata Gren. & Godr. ————+ An erect biennial or 
annual l-3 m. tall, glabrous and claucous throughout, the stems armed in tine 
lower parts with short prickles; leaves entire or somewhat cleft, 5-1<¢ cm. long, 
the lower oblanceolate, the upper oblong, all sessile and somewhat clasping, 
erect, the margins and midribs beneath armed with sharp small prickles; 4netemey 
Hy -secence® (gracefulfpanicle) 50-60 cm. long with wide oreading slender almost 
naked branches bearing small bracts 2-5 mn. long; heads narrowly oblong, .borne 
on very slender ve cles, ae ? see a 455 in flower, increasing to 10-12 mn. in 
fruit, the Te hoe easier 4secries—oswiesuar—teneeciete—o>tinear> 
: bracts wie narrow scarious margins; corollas yellowish, 
becoming bluish; achenes 5 ma. long, mostly 5-ribbed on each face, tapering 
into a hair-like peak as long as or longer than the body; pappus white. 
” 
ra Frequent in dry waste places; introauced from surope. 
= A ath tnt 
