320 
CICHORIACEAE. Vou. III. 
6. Lactuca canadénsis L. Wild or Tall Lettuce. Wild Opium. Fig. 4073. 
7. Lactuca sagittifolia Ell. 
Fig. 4074. 
L. sagittifolia Ell. Bot. S. C. & Ga. 2: 253. 
Lactuca integrifolia Bigel. Fl. Bost. Ed. 2, 287. 1824. 
Not Nutt. 1818. 
Arrow-leaved 
1821-24. 
Lactuca canadensis L. Sp. Pl. 796. 1753. 
Lactuca elongata Muhl.; Willd. Sp. Pl. 1525. 1804. 
Lactuca canadensis montana Britton, in Britton and 
Brown, Ill. Fl. 3: 274. 1898. 
Biennial or annual, glabrous throughout, some- 
what glaucous; stem leafy up to the inflorescence, 
3°-10° high, branching above into a narrow pan- 
icle. Leaves mostly sinuate-pinnatifid, those of 
the stem sessile or auriculate-clasping, 2’-8’ long, 
the uppermost smaller, often lanceolate, acumi- 
nate and entire, sometimes all lanceolate and en- 
tire, the basal often 12’ long, narrowed into peti- 
oles; heads numerous, 2”-3” broad; involucre 
cylindric, 4”-6” high, its outer bracts shorter than 
the inner; rays yellow; achenes oval, flat, about 
as long as the filiform beak; pappus white. 
In moist, open places, Nova Scotia to British Co- 
lumbia, Georgia, Alabama, Louisiana, Arkansas and 
Colorado. Santo Domingo. Trumpetweed, trumpet- 
milkweed, trumpets, and fire-weed. Butter- or horse- 
weed. Devil's-weed. Devil’s-iron-weed. June-Nov. 
Lactuca Mérssii Robinson, with blue rays, and 
achenes 3 or 4 times longer than their filiform beaks, 
may be a hybrid with L. spicata. 
i 
Wy 
L. elongata var. integ. T.& G. Fl. N. A. 2: 496. 1843. 
Biennial; stem glabrous throughout, or hirsute 
below, leafy nearly up to the usually paniculate 
inflorescence, 2°-6° high. Leaves oblong, oblong- 
lanceolate or lanceolate, acuminate or acute, en- 
tire or denticulate, the lower rarely pinnatifid, 
sometimes spinulose on the margins, those of the 
stem sessile or sagittate-clasping, 3’-6’ long, 4’-14’ 
wide, the basal and lower ones petioled; heads 
commonly very numerous, 2’-4” broad; involucre 
cylindric, 5”-7” high, the outer bracts shorter than 
the inner; rays yellow or reddish; achenes oval, 
flat, rather longer than their filiform beaks; pap- 
pus white. 
In dry, open soil, New Brunswick and Ontario to 
Georgia, Idaho and Kansas. Called also devil’s-iron- 
weed. July—Sept. 
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a> 
My 8. Lactuca pulchélla (Pursh) DC. Large- 
\ flowered Blue Lettuce. Fig. 4075. 
XK Sonchus pulchellus Pursh, Fl. Am. Sept. 502. 1814. 
a Lactuca integrifolia Nutt. Gen, 2: 124. 1818. 
7 VZ Lactuca pulchella DC. Prodr. 7: 134. 1838. 
Perennial, glabrous throughout, somewhat glau- 
: cous; stem rather slender, leafy up to the corym- 
N bose-paniculate inflorescence, 1°-3 
high. Leaves 
linear-lanceolate, lanceolate or oblong, acute, en- 
tire, dentate, lobed or pinnatifid, those of the stem 
sessile or partly clasping, 2’-8’ long; 2-18” wide, 
the lowest and basal ones sometimes petioled; 
heads mostly numerous, 6-10” broad; branches 
and peduncles scaly; involucre well imbricated, 
8’-10” high, its outer bracts successively shorter, 
ovate-lanceolate; rays bright blue or violet; 
achenes oblong-lanceolate, flat, twice as long as 
their tapering beaks; pappus white. 
In moist soil, western Ontario to British Columbia, 
Michigan, Iowa, Kansas, New Mexico and California. 
June-Sept. 
Lactuca campéstris Greene, of the prairie region, 
is described as differing from this by yellow rays. 
