420 Madieae 



short-peduncled or sessile in the upper axils and at the ends 

 of the short branches; cup of receptacle broadly campanulate, 

 enclosing many disk-flowers; disk-achenes cuneate-oblong, 

 4-angled; ray-achenes falcate-obovate. 



Frequent on the plains and grassy hills. July-September. 



2. M. dissitiflora (Nutt.) T. & G. Slender, loosely branching, 

 5-7 dm. high, viscid; heads scattered, broad-ovate, about 6 mm. 

 high; cup of receptacle ovoid, not closed; achenes thin, not an- 

 gular. 



On wooded slopes in the Santa Monica Mountains. May-July. 



36. MADABIA DC. 



Erect glandular pilose or somewhat hispid annuals, 

 with lanceolate usually entire leaves, and corymbosely 

 panicled heads of showy yelloAV flowers. Involucral 

 bracts wholly enclosing the ray-achenes. Receptacle 

 convex densely fimbrillate-hirsute and with a circle of 

 bracts between ray- and disk-flowers. Disk-flowers sterile. 

 Ray-flowers fertile, showy, their achenes laterally com- 

 pressed, smooth, not incurved. Pappus none. 



1. M. elegans (Don.) DC. Steins rather stout, 8-15 dm. 

 high; leaves scattered, lanceolate, entire or serrate, sessile by 

 a broad base; whole herbage viscid with stalked glands, the 

 peduncles and involucres hirsute with long white hairs ; heads 

 numerous in an ample corymbose panicle ; rays 12-15, about 2 

 cm. long, yellow, often with dark red base; achenes rather thin 

 and flat, dark brown or blackish. 



Near Fairmont, Davidson; Trabuco Canyon, Santa Ana Mountains. June- 

 September. 



37. CENTBOMADIA Greene. 



Rigid corymbosely or diffusely branching annuals, 

 with alternate pinnatifid or entire spinescent leaves. 

 Herbage more or less resiniferous or glandular through- 

 out. Involucral bracts subulate, pungent, half enclosing 

 the ray-achenes, persistent. Ray-flowers 15-40, yellow, 

 small, fertile. Disk-flowers sterile. Receptacle convex. 



