ASTERACEAE. 385 



36. MADIA Mol. Tarweed. 



Glandular and viscid heavy-scented herbs with at 

 least the upper leaves alternate, entire or toothed. Heads 

 axillary and terminal. Involucre angled by the salient 

 carinate backs of the uniserial involucral bracts, these 

 usually completely enclosing the ray-achenes, their tips 

 herbaceous. Receptacle flat or convex, bearing a single 

 series of chaff united and forming a cup between the 

 ray- and disk-flowers, the inner portion naked or fimbril- 

 late. Ray-flowers yellow, rather short, 3-lobed, fertile. 

 Disk-flowers sterile. Pappus none. Achenes laterally 

 compressed, smooth, beakless. 



1. M. sativa Mol. Stem simple with a few short ascending 

 branches above, erect, stout, 3-9 dm. high, pubescent with slender 

 hairs and beset with stalked very viscid glands; leaves lanceolate, 

 nearly entire, glandular-pubescent; heads 12 mm. high, 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 angular. 



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



37. MAD ARIA DC. 



Erect glandular pilose or somewhat hispid annuals, 

 with lanceolate usually entire leaves, and corymbosely 

 panicled heads of showy yellow 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 later- 

 ally compressed, smooth, not incurved. Pappus none. 



1. M. elegans (Don.) DC. Stems 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 Moun- 

 tains. June- September. 



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