450 Cichorieae 



2. S. asper (L.) All. Stouter than the last, the stems distinctly 

 angled, very leafy ; leaves entire or pinnatifid, prickly-margined, 

 the auricles helicoid and appressed to the stem ; achenes 3-nerved 

 on each side, otherwise smooth. 



A less common weed than the last. Native of Europe. 



78. LACTUCA L. 



Tall leafy herbs with small panicled heads. Involu- 

 cre cylindric, its bracts imbricated in several series, the 

 outer shorter. Receptacle flat, naked. Achenes flat- 

 tened, 6-10-ribbed, beaked. Pappus of copious white or 

 brownish capillary bristles. 



1. L. Scariola L. Biennial, glaucous; stems leafy, panicu- 

 lately branched, hirsute at the base or glabrous throughout, 6-18 

 dm. high ; leaves oblong to oblong-lanceolate, spinulose-mar- 

 gined, denticulate or pinnatifid, sessile or auriculate-clasping, 

 midrib spinulose or hispid; heads 4-8 mm. broad, 6-12-flowered, 

 very numerous, in an open panicle; involucre cylindric ; ligules 

 yellow; achenes obovate-oblong, about equaling the filiform 

 beak ; pappus white. 



Rather common in streets about Los Angeles. Native of Europe. 



79. AGOSERIS Raf. 



Perennial or annual herbs, mostly acaulescent, with 

 tufted basal leaves, and solitary heads of yellow or rarely 

 purple flowers at the ends of naked or bracted scapes. 

 Involucre campanulate to oblong, its bracts imbricated 

 in several series. Receptacle flat, naked or faveolate. 

 Achenes not flattened, 10-ribbed, beaked at the summit. 

 Pappus of copious slender simple white bristles. 



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

 rowly oblanceolate, pinnatifid into slender ascending lobes, apex 

 usually entire and slenderly acuminate; ligules short, deep yel- 

 low, 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. 



