ASTERACEAE. 413 



1. A. plebeia Greene. Robust, 4-6 dm. high; leaves narrowly 

 oblanceolate, pinnatifid into slender ascending lobes, apex usually 

 entire and slenderly acuminate; ligules short, deep yellow, scarcely 

 or not at all surpassing the involucral bracts, these woolly at the 

 base; achenes 4-5 mm. long; the beak 10-12 mm. long; pappus soft, 

 white. 



Occasional in the San Gabriel and Santa Ana Mountains. May- 

 July. 



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

 high; herbage woolly-pubescent, the wool more or less deciduous 

 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. 



82. CREPIS 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 runcinate- 

 pinnatifid, oblong or spatulate, at least the upper clasping; heads 

 several, subcorymbose, 2.5-4 cm. high; involucre canescent or 

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

 downy within; achenes glabrous, 13-striate. 



Occasional along streets in Los Angeles and Pasadena. 



83. HIERACIUM 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. 



