Chicory Tribe 451 



2. A. retrorsa (Benth.) Greene. Peduncles usually about 3 

 dm. high ; herbage woolly-pubescent, the wool more or less de- 

 ciduous in age ; leaves pinnately parted into narrowly linear or 

 lanceolate retrorse segments ; outer involucral bracts broad, inner 

 linear, narrowly acuminate, equaling the pappus ; ligules short ; 

 achenes 5-6 mm. long, beak slender, 18-20 mm. long. 



Summit of Santiago Peak. May-July. 



80. CBEPIS L. 



Perennial or annual herbs, with alternate or basal 

 mostly toothed or pinnatifid leaves, and small or middle- 

 sized heads, usually paniculate-corymbose, of yellow 

 flowers. Involucre cylindric or campanulate, its princi- 

 pal bracts in 1 series, equal, with a number of exterior 

 smaller ones, 10-20-ribbed or -nerved, not transversely 

 rugose, beakless. Pappus copious, of very slender white 

 bristles. 



1. C. biennis L. Annual or biennial, pubescent or hirsute, 

 leafy at least below, branched above, 6-9 dm. high; leaves run- 

 cinate-pinnatifid, oblong or spatulate, at least the upper clasp- 

 ing; heads several, subcorymbose, 2.5-4 cm. high; involucre 

 canescentor pubescent, 8-12 mm. high, its principal bracts linear- 

 lanceolate, downy within ; achenes glabrous, 13-striate. 



Occasional along streets in Los Angeles and Pasadena. 



81. HIEBACIUM L. 



Perennial hispid or villous herbs, with alternate or 

 basal leaves, and solitary corymbose or paniculate, small 

 or middle-sized heads of usually yellow flowers. Invo- 

 lucre with its principal bracts in 1-3 series, the outer 

 gradually smaller or abruptly much smaller. Recep- 

 tacle flat, naked or short fimbrillate. Achenes terete or 

 4-5-angled, 10-15-ribbed, beakless. Pappus copious, of 

 1-2 rows of simple rather stiff persistent brownish 

 bristles. 



1. H. Parishii Gray. Puberulent above with no glandular 

 hairs, leafy up into the narrowly oblong panicle, 3-6 dm. high ; 



