DICOTYLEDONOUS PLANTS got 
1. L. canadensis, L. Wuitp Lettuce. Biennial; stem erect, 
smooth, hollow, branched above, 3-10 ft. high. Leaves lanceolate 
to spatulate, pale beneath, the lower petioled and pinnately cut, the 
upper sessile, clasping, and nearly entire. Heads numerous, about 
20-flowered. Flowers yellow; akenes oval, flat, l-+ribbed on each 
side, minutely roughened, about as long as the beak. Pappus 
white. In waste places.* 
2. L. acuminata, Gray. Buiur Lettuce. Stem very leafy, 
smooth, paniculately branched above, 3-6 ft. high. Leaves ovate to 
lanceolate, taper-pointed, often hairy beneath, the lower on winged 
petioles and often sinuate-lobed, the upper sessile. Heads racemed, 
on divergent and bracted peduncles. Flowers blue. Akenes slightly 
compressed, beak very short. Pappus white. In waste places.* 
XIX. SONCHUS, L. 
Annual or perennial. Leaves mostly toothed or pinnately 
cut, prickly margined. Heads in corymbs or panicles; bracts 
in several series, the outer shorter; receptacle naked. Flowers 
yellow, rays truncate, 5-toothed at the apex. Akenes oval to 
oblong, compressed, ribbed, truncate at the apex. Pappus of 
numerous soft white hairs.* 
1. S.oleraceus, L. Sow Tutstre. Annual; stem erect, branched, 
smooth, 2-6 ft. high. Leaves spiny-toothed, the lower long-petioled, 
very irregularly cut or pinnatifid, the upper clasping by an eared 
base. Involucre downy when young. Akenes channeled and trans- 
versely wrinkled. In waste places on very rich soil.* 
2. S. asper, Vill. Sprny Sow Tuistite. Annual; stem erect, 
smooth, branched but little, 2-6 ft. high. Leaves undivided, spatu- 
late to oblanceolate, fringed with spiny teeth, the lower narrowed 
into a petiole, the upper clasping by an eared base, the ears rounded. 
Heads numerous ; involucre glabrous. Akenes flattened, margined, 
3-nerved on each side, smooth. In waste places.* 
