SPECIES AND VARIETIES. 273 



minal lobe and smaller lateral ones, all pointed and coarsely- 

 toothed, the upper leaves small, less cut, embracing the stem 

 by pointed auricles ; flower-heads in closely- sessile clusters of 

 two or three along the stiff, spreading branches, the florets 

 large, bright blue. — Succory. — Dry wastes, roadsides, and 

 borders of fields. Fl. July, August. 



(171) Sonchus. Sowthistle. 



S. arvensis : stems 2-3 feet high ; leaves long, runcinately- 

 pinnatifid or sinuate, the lobes lanceolate or triangular, bor- 

 dered by small prickly teeth, the upper ones clasping the stem 

 with short broad auricles ; flower-heads large, bright yellow, 

 in loose terminal panicles, the branches, peduncles, and invo- 

 lucres more or less hispid with brown or black glandular hairs^ 

 — A cornfield weed. Fl. August. 



S. oleraceus : annual ; stem thick, hollow, 1-4 feet high, 

 glabrous ; leaves thin, pinnatifid, with a broad, heart-shaped 

 or triangular terminal lobe, bordered with irregular, pointed 

 or prickly teeth, and a few smaller lobes or coarse teeth along 

 the broad leafstalk, the upper leaves narrow and clasping the 

 stem with short auricles ; flower-heads rather small, pale yel- 

 low, in a short corymbose panicle, sometimes almost umbellate. 

 — A weed of cultivation. Fl. June to August. 



Var. aspera : leaves darker, less divided, but much more 

 closely bordered with prickly teeth ; clasping auricles broader, 

 rounded, and more prickly toothed. 



(172) Crepis. Hawk's-beard. 



C. vlrens : annual or biennial ; stems erect or ascending, 

 1-3 feet high, glabrous or nearly so; leaves linear or lanceo- 

 late, toothed or pinnatifid, with triangular or narrow, but short 



